Friday, December 25, 2009
Radar Shots of the Longview Tornado
The shot above shows a strong velocity couplet moving across the Loop 281 HWY 80 intersection.
The shot above shows a text book hook echo image of the supercell thunderstorm producing the tornado.
The shot above shows a three dimensional image of the storm as it produced the EF-2 tornado.
The following is from the National Weather Service storm survey:
...A storm survey has been completed for the December 23rd Longview
tornado...
The national weather service performed a storm survey in Harrison
County Texas for a tornado which touched down near Longview on
December 23rd 2009 at 4:39 pm.
An ef2 tornado touched down on the east side of Longview...just west
Of the intersections of east cotton street. And industrial drive.
The tornado then tracked north northeast causing damage to several
Industrial buildings along industrial drive...it crossed industrial
Drive just south of highway 80...causing significant damage to the
Fed ex building and other surrounding industrial businesses.
The tornado then crossed highway 80...causing significant tree and
Roof damage to several homes in a residential neighborhood. The
Track continued north northeast as the tornado crossed loop 281 just
South of page road. The tornado caused major roof damage to a home
On page road. Before continuing northward...the storm continued to
Cause tree and roof damage in a residential area before crossing
Peter Bonner road near sandy lane. More tree and roof damage was
Observed as the storm tracked into a rural area...ending south of fm
449 on Keasler road around 4:56 pm.
The tornado was rated an ef2 with winds estimated at 110 to 120 mph.
The tornado was on the ground for 17 minutes...its width was 200
Yards...and the path length was approximately 7 miles.
Wednesday, December 23, 2009
Tornadoes possible today...flurries possible tomorrow
A strong storm system will finally move into East Texas today and with it, a threat for severe weather, including tornadoes. Out ahead of this system, very moist air from the Gulf of Mexico is surging north across the Lone Start State. We are even seeing a few breaks in the clouds this morning and that could lead to extra instability this afternoon.
Winds out ahead of this system this afternoon will increase out of the southeast around 18 mph gusting as high as 25 mph. This will help set the stage for the turning of wind with height that could lead to tornado development this afternoon and evening. The greatest risk of tornadoes appears to be from Tyler to Longview to Marshall and points south from 4PM through the overnight hours.
Scattered thunderstorms will develop ahead of the cold front during this time and it will be these scattered storms with the best chance to rotate. A strong line of storms will develop late tonight around the Metroplex and race east early tomorrow morning. Along this line we will see the possibility of strong winds and even an isolated tornado, although the tornado threat will not be as high as it will with any discreet storm this afternoon and evening.
After this strong line of storms move through, very cold air will rush in tomorrow. Many of our forecast models are now indicating all the moisture may not be out of the area before the cold air moves in, especially north of I-20. What does this mean? It means there is a chance areas north of I-20 could see a few snow flurries.
The light blue around the I-20 and I-30 corridors is light snow that could eb falling tomorrow afternoon.
It all depends on the exact track of the upper low pressure system tomorrow. If this system moves farther south, the chance of snow could move into the Tyler and Longview areas however, no accumulation is anticipated at this time. Right now it does appear there could be a light accumulation north of I-30 and if you are planning travel into Oklahoma, several inches of snow could accumulate tomorrow.
Monday, December 21, 2009
Severe Storms Wednesday
A very strong storm system will develop on the Leeward side of the Rocky Mountains tomorrow afternoon. This storm system will draw in very moist air from the Gulf of Mexico and collide with a strong cold front across East Texas on Wednesday afternoon. The greatest likelihood of severe weather appears to be late Wednesday Afternoon through early Thursday morning for all of East Texas with the greatest threat east of a line from Sulphur Springs to Tyler to Lufkin. All types of severe weather are possible with this system including hail up to nickel size, gusty winds to 80 mph, and isolated tornadoes.
For anyone planning on traveling around Christmas, Wednesday will not be the best of travel days. If you are planning a flight to the Midwest, this same storm system will cause blizzard conditions in some areas.
Thunderstorms will begin to develop late tomorrow as mid level instability increases tomorrow afternoon. These thunderstorms will be elevated, forming above the boundary layer. Thanks to increasing steep mid level lapse rates and shear in the mid levels of the atmosphere, a few of these storms tomorrow could produce small hail but the overall threat of severe weather is very low.
On Wednesday enough low level moisture will be across the area to allow for surfaced base thunderstorm development. With the low level winds increasing around a developing area of low pressure across North Texas, there will be enough turning of the wind with height to give much of East Texas a threat of tornadoes.
The image above is taken from the 12Z run of the NAM forecast model on BUFKIT. There are a couple of things that show the possibility of tornadic supercells developing Wednesday afternoon and night. First is the hodograph, the graph in the upper left corner. This shows the wind speed and direction as you increase in height through the atmosphere. This is showing a classic large clockwise turn, or veering, of the wind with height, along with an increase in speed. This is very favorable for the lower levels of the atmosphere to spin.
Next we see the actual skew-t diagram, on the right. You notice the solid yellow line to the right of the solid red line. This is showing the amount of convective available potential energy, or CAPE, available for thunderstorm updrafts. Now the amount of CAPE is not all that great, only around 500 J/kg. But this is more than enough when you combine the shear and forcing associated with this upcoming storm system. So we will see thunderstorms developing in the boundary layer with rotating updrafts. All this means we will have to be on the watch for tornadoes Wednesday afternoon and evening as storms begin to develop.
As we head into Thursday morning the overall trend of these storms will be to form a squall line and race east. As this happens the overall severe weather threat will become more of a strong wind event than hail or tornadoes however, we will still have a chance at seeing an isolated tornado along the squall line.
For anyone planning on traveling around Christmas, Wednesday will not be the best of travel days. If you are planning a flight to the Midwest, this same storm system will cause blizzard conditions in some areas.
Thunderstorms will begin to develop late tomorrow as mid level instability increases tomorrow afternoon. These thunderstorms will be elevated, forming above the boundary layer. Thanks to increasing steep mid level lapse rates and shear in the mid levels of the atmosphere, a few of these storms tomorrow could produce small hail but the overall threat of severe weather is very low.
On Wednesday enough low level moisture will be across the area to allow for surfaced base thunderstorm development. With the low level winds increasing around a developing area of low pressure across North Texas, there will be enough turning of the wind with height to give much of East Texas a threat of tornadoes.
The image above is taken from the 12Z run of the NAM forecast model on BUFKIT. There are a couple of things that show the possibility of tornadic supercells developing Wednesday afternoon and night. First is the hodograph, the graph in the upper left corner. This shows the wind speed and direction as you increase in height through the atmosphere. This is showing a classic large clockwise turn, or veering, of the wind with height, along with an increase in speed. This is very favorable for the lower levels of the atmosphere to spin.
Next we see the actual skew-t diagram, on the right. You notice the solid yellow line to the right of the solid red line. This is showing the amount of convective available potential energy, or CAPE, available for thunderstorm updrafts. Now the amount of CAPE is not all that great, only around 500 J/kg. But this is more than enough when you combine the shear and forcing associated with this upcoming storm system. So we will see thunderstorms developing in the boundary layer with rotating updrafts. All this means we will have to be on the watch for tornadoes Wednesday afternoon and evening as storms begin to develop.
As we head into Thursday morning the overall trend of these storms will be to form a squall line and race east. As this happens the overall severe weather threat will become more of a strong wind event than hail or tornadoes however, we will still have a chance at seeing an isolated tornado along the squall line.
Friday, December 18, 2009
Strong Storm Could Hit Just Before Christmas
The week of Christmas looks very interesting around East Texas to say the least. A very strong Lee Side low pressure system looks to develop Tuesday afternoon in the Colorado High Plains and move east northeast into the Midwest Christmas Eve. Out ahead of this storm system warm moist air from the Gulf of Mexico will surge northwest into the circulation of this strong low pressure. Because of this surface dewpoints in East Texas could easily reach the low 60s setting the stage for a possible severe weather event early Wednesday.
Right now it appears there will be plenty of instability in the lowest level of the atmosphere to produce scattered thunderstorms. The Lifted Index, or the difference between the lifted parcel temperature and the parcel’s surrounding temperatures, is negative across most of East Texas Wednesday morning.
Also, the amount of bulk shear needed for supercell development will be more than enough, on the order of 50 to 70 knots.
Finally, the amount of surface based CAPE is enough to get the air rising from the surface leading to thunderstorm development. Now the amount of CAPE is nothing compared to what we might find during the spring severe weather months. However, when you take the normalized CAPE, or the amount of CAPE and divide it by the distance between the level of free convection and equilibrium level, you get a level conducive for strong updraft strength.
Bottom Line, it looks as though the atmosphere is setting up for a round of low topped supercells Wednesday from East Texas through much of the lower Mississippi Valley with the potential for gusty winds, large hail, and even a few tornadoes.
Now for what everyone wants to know, will it snow for Christmas? Well, if I were a betting man I would bet against it however, the chances of snow are not at zero. That means there is hope for all you snow lovers of a few flurries flying on Christmas morning but no accumulation would occur. So what could lead to the possibility for snow flurries? The answer is a mid level disturbance, or shortwave, that sometimes produces surprise snow events in winter, especially across the south. (December 2004 Texas Gulf Coast)
On Christmas Eve a fast moving disturbance will drop out of Canada and race towards the southeast. Behind this disturbance will be a reinforcing shot of colder air for Christmas day. As this system drops south, clouds and flurries will form in the Northern Plains.
This disturbance will continue to move overnight Christmas Eve into Christmas Morning. As it moves into the Southern Plains, moisture will be very limited but it still appears there could be a few flurries as this system moves in.
By 6AM Christmas morning this system is forecast to be moving through the Metroplex. The big question will be moisture. Right now it appears there will not be enough moisture to produce snow flurries across East Texas. However, we will also be located in the left exit region of a strong jet streak that will aid in lift. If there is a little more moisture available than forecast, we could see a few flurries on Christmas day. I do want to stress that the odds of this occurring are very slim. Right now my official forecast for Christmas is partly cloudy and cold with highs around 40 and lows in the 20s. Snow lovers, keep believing……maybe Santa will bring a surprise.
Right now it appears there will be plenty of instability in the lowest level of the atmosphere to produce scattered thunderstorms. The Lifted Index, or the difference between the lifted parcel temperature and the parcel’s surrounding temperatures, is negative across most of East Texas Wednesday morning.
Also, the amount of bulk shear needed for supercell development will be more than enough, on the order of 50 to 70 knots.
Finally, the amount of surface based CAPE is enough to get the air rising from the surface leading to thunderstorm development. Now the amount of CAPE is nothing compared to what we might find during the spring severe weather months. However, when you take the normalized CAPE, or the amount of CAPE and divide it by the distance between the level of free convection and equilibrium level, you get a level conducive for strong updraft strength.
Bottom Line, it looks as though the atmosphere is setting up for a round of low topped supercells Wednesday from East Texas through much of the lower Mississippi Valley with the potential for gusty winds, large hail, and even a few tornadoes.
Now for what everyone wants to know, will it snow for Christmas? Well, if I were a betting man I would bet against it however, the chances of snow are not at zero. That means there is hope for all you snow lovers of a few flurries flying on Christmas morning but no accumulation would occur. So what could lead to the possibility for snow flurries? The answer is a mid level disturbance, or shortwave, that sometimes produces surprise snow events in winter, especially across the south. (December 2004 Texas Gulf Coast)
On Christmas Eve a fast moving disturbance will drop out of Canada and race towards the southeast. Behind this disturbance will be a reinforcing shot of colder air for Christmas day. As this system drops south, clouds and flurries will form in the Northern Plains.
This disturbance will continue to move overnight Christmas Eve into Christmas Morning. As it moves into the Southern Plains, moisture will be very limited but it still appears there could be a few flurries as this system moves in.
By 6AM Christmas morning this system is forecast to be moving through the Metroplex. The big question will be moisture. Right now it appears there will not be enough moisture to produce snow flurries across East Texas. However, we will also be located in the left exit region of a strong jet streak that will aid in lift. If there is a little more moisture available than forecast, we could see a few flurries on Christmas day. I do want to stress that the odds of this occurring are very slim. Right now my official forecast for Christmas is partly cloudy and cold with highs around 40 and lows in the 20s. Snow lovers, keep believing……maybe Santa will bring a surprise.
Thursday, December 17, 2009
Gulf Low will turn into a Major Winter Storm!
This morning an area of low pressure was beginning to develop of the Coast of Brownsville, TX producing clouds and rain across a good bit of the Texas Gulf Coast. At the same time, cold air is spilling into the eastern United States. As this low strengthens and moves northeast, a major snowstorm is set for the Mid Atlantic and Appalachians.
Right now it appears our area of low pressure off the Texas Coast will explode into a very strong low pressure near the Outer Banks of North Carolina Saturday morning. This will cause near blizzard conditions from parts of North Carolina through the Piedmont of Virginia. Widespread snowfall amounts of over 6” can be expected in these areas with isolated amounts over one foot possible. The snowfall forecast from the 12Z NAM today shows a wide area of over 18” from the mountain of North Carolina to Central Virginia.
Right now it appears our area of low pressure off the Texas Coast will explode into a very strong low pressure near the Outer Banks of North Carolina Saturday morning. This will cause near blizzard conditions from parts of North Carolina through the Piedmont of Virginia. Widespread snowfall amounts of over 6” can be expected in these areas with isolated amounts over one foot possible. The snowfall forecast from the 12Z NAM today shows a wide area of over 18” from the mountain of North Carolina to Central Virginia.
Wednesday, December 16, 2009
A Sneak Peek at the Christmas Forecast
Every year around this time most everyone I meet and talk with ask me one question. Will we have a white Christmas? Unfortunately for all the snow lovers here in East Texas, snowfall is a rare occurrence, even more so on Christmas Day. Judging strictly on climatology data, the odds of seeing a white Christmas here this year are very slim, less than 20%. So what will happen this year?
I want to stress that what you are reading is not a forecast but is a trend on what we might expect this Christmas. Right now it appears a cold front will sweep through East Texas on Wednesday the 23rd. The air mass behind this front will be of arctic origin so we can expect cold temperatures Christmas Eve and Christmas Day. As this front moves through, showers can be expected out ahead of this front on Wednesday. Now for the interesting aspect to this trend. The latest long range forecast models are developing an area of low pressure along this front. The current placement of this low pressure Wednesday would give parts of the Gulf Coast region a chance of severe weather.
As this low intensifies and moves northeast, cold air with moisture would wrap around giving much of East Texas a chance of snow flurries or light snow showers. Temperatures would be very cold behind this front so any snow that falls would have a chance of accumulating. The window of opportunity for snowfall would last through early Christmas Eve Morning.
For Christmas day, very cold air would be in place with morning low temperatures in the teens and highs struggling to reach the 30s. For those planning to travel to the Northeast, an all out blizzard could be expected with this system.
Again, what you have just read is not my official Christmas Forecast. Right now my official forecast would call for dry, cold conditions with lows in the 20s and highs in the 40s. But it is always fun to look at all the possibilities of what “could” happen around Christmas.
This trend will more than likely change many times between now and Christmas. Keep checking back as I will post updates on what you might expect this Christmas weather wise.
Tuesday, December 8, 2009
Strong Storm Pounds U.S.
A massive storm system is plaguing the United States this week causing everything from severe weather and tornadoes along the Gulf Coast to blizzard conditions in the Great Plains. A strong area of low pressure is developing on the lee side of the Rockies and will produce a large swath of snow from southern California to the Great Lakes. Many areas will receive of 12” of snow across the Plains.
Temperatures this morning range greatly across the country from -34°F (wind chill -52°F) in Havre, MT to 82°F in Miami, FL.
A second area of low pressure is developing along a northward moving warm front along the Gulf Coast. It is this area of low pressure that has the possibility to produce severe weather across southeast Texas through most of Louisiana into Central and southern Mississippi. South of the warm front the atmosphere is conducive for the development of severe thunderstorms that could produce gusty winds and isolated tornadoes, mainly across Louisiana. To the north of this warm front in East Texas and Northern Louisiana, there could be a few strong to severe storms producing hail and high winds. The tornado threat in these areas is very low due to the cooler stable air near the surface.
This massive storm system will leave very few areas of the country untouched. By Thursday the area of low pressure will be over southeast Canada produce a very strong northwest flow across the Great Lake and Northeast. This will provide very windy conditions, cold temperatures, and the possibility of lake effect snows.
In the wake of this low pressure a strong area of high pressure over the Ohio Valley could provide the necessary cold air for an icy situation across parts of the southern plains by Friday. Right now the return of moisture will be in question but, the forecast position of the area of high pressure is enough to spark my interest.
Friday, December 4, 2009
Snow on the way to East Texas
Light snow continues to develop across Central Texas this morning and will push into East Texas late this morning into the early afternoon hours. Snow should begin east of the Trinity River around 10:00 AM and spread east from there throughout the afternoon. How far north will the snow reach? At this time it still appears the heaviest snow will remain south of the Tyler Longview area. Areas from Palestine to Center south could see up to an inch of snow with up to two inches of snow possible south of Lufkin. We could see a light dusting of snow as far north as Tyler and Longview. The exact track of this system is still a bit unknown but the heaviest snow will likely fall to the southeast of most of East Texas.
Thursday, December 3, 2009
Freezing temperatures tonight followed by a chance of snow Friday
Many areas of East Texas saw their first freeze this morning with some areas dropping into the upper 20s and lower 30s. Mostly sunny skies but cold temperatures will continue today with high temperatures only reaching the upper 40s.
We are currently monitoring an upper level disturbance across the Panhandle this morning producing light snow near Amarillo. This disturbance will move southeast across Texas overnight tonight and tomorrow bringing a chance of light snow or snow flurries to the southern half of East Texas tomorrow afternoon. There is a chance the snow could start off as light rain showers but with most of the upper atmosphere well below freezing and drier air located near the surface, evaporational cooling will rapidly change any rain over to snow. Right now it appears the snow will be too light for any major accumulation however, we could see a light dusting from a Palestine to Bullard to Carthage line south.
As this disturbance moves towards the Gulf of Mexico, an area of low pressure will begin to develop off the coast bringing another chance of snow to our southeastern counties. It does appear this low could cause significant accumulations of snow north west of its track. If the path of this low changes it could drastically change our snow forecast for East Texas. Right now the low appears to be too far east keeping the accumulating snowfall south and east of East Texas with the big winner being southwest Louisiana, where some computer models paint 4 to 6 inches of snow. Winter storm watches have been posted for the extreme southern counties of East Texas where some computer models indicate 2 inches of snow could fall.
The overall trend of this developing system is to continue pushing the moisture farther south and east making the chance of snow in East Texas less. The two images below indicate snowfall accumulation.
The image above is from the GFS forecast model's total snow accumulation for Friday's event. Areas in Pink are up to an inch of snow with the light blue being over 2 inches. This model indicates 3 inches or more of snow in the yellow area stretching from Center through Lufkin and totaling nearly 5 inches near Crocket. I think this model has a better handle on the area of snowfall but has too much accumulation.
The image above shows total forecast snowfall from the NAM forecast model. Notice the area of heavy snow, 6 inches plus, is well off to our southeast and produces a light dusting across East Texas with a bull's eye of 2 inches near Jasper. I think this model has a great grasp on the amount and area of snowfall however, i expect the area of a light dusting to be a little farther northwest, but not by much. We will continue to monitor this developing winter weather situation but for all the snow lovers out there, we might have to wait until the next storm system. The winter is still young.
Tuesday, December 1, 2009
Snow Possible for Parts of East Texas This Week
An upper level low pressure system brought a good deal of snow to parts of West Texas this week. This upper level low will cause widespread rain to develop this evening across East Texas and usher in some much colder air tomorrow, which could set the stage for a winter weather event Friday. Right now it looks as though a weak disturbance will move through East Texas Friday morning bringing a chance of snow flurries to the area. As this disturbance moves out into the Gulf of Mexico, an area of low pressure will develop and spread precipitation back across East Texas, especially across the southern half of the region. If this were to happen with cold air already in place, a significant winter storm could develop. As with any winter weather potential across East Texas, a lot could change between now and then. If this developing low pressure forms farther east in the Gulf, East Texas would get little or no precipitation. If this low develops farther west there is a good chance East Texas would just have a cold rain event. Stay tuned to your East Texas News Leader for the latest on this developing situation. I will continue to update the situation and more details become available.
Monday, November 30, 2009
Snow for Parts of Texas This Week.
An area of low pressure in the upper atmosphere associated with very cold air aloft will move across the state of Texas early this week. Out ahead of this low pressure copious amounts of Gulf Moisture will spread across East Texas. Rain will begin to develop late Tuesday and could be heavy at times Tuesday night.
While heavy rain breaks out across our area Tuesday night, under the actual upper low across west Texas, heavy snow could develop. There are winter storm warnings out for much of west Texas and southern New Mexico where up to 6 to 8 inches of snow could fall. As this area of low pressure moves east, the core of upper level cold air will move with it bringing a threat of snow mixing in with rain across much of west Texas Tuesday night and Wednesday morning.
Will this threat of snow move into East Texas? Although I can’t rule it out completely, there are a few things going against us getting any snow. The main obstacle preventing snow is the fact that our elevation is much lower in East Texas.
Below is an image of the forecast 850mb temperatures. We usually need these temperatures to be below freezing for snow to fall, which they are, running -2 to -4 degrees Celsius.
Below is an image of the forecast surface temperatures Wednesday Evening. Temperatures are forecast to be between 35 and 40 degrees. In this range snow could reach the surface.
The final image is the accumulated 6 hour precipitation. This image shows the heaviest wrap around precipitation north of I-30, some of which could be snow. If you look at the surface temperature map again you will see areas north of Mt. Pleasant where temperatures are below 35. This could allow for a light dusting if this verifies on elevated surfaces.
The mid and upper levels of the atmosphere will be plenty cold enough for snow to develop but the depth of above freezing temperatures near the surface is just too great to allow the snow to reach the surface. There are a few areas in East Texas where the elevation is over 700’ and in these locations, it is possible a few wet flakes could reach the surface. If this area of low pressure is slightly stronger than forecast then there could be heavier precipitation under the core and this would drag the colder temperatures aloft to the surface which could lead to a better chance of snow. Many surprise snow events have happened with these upper lows including the snow on Easter of 2007 here in East Texas and the heavy snow event on Christmas Eve of 2004 along the Gulf Coast. So this will need to be watched closely.
One thing is certain. Behind this low, the coldest air of the season will move into East Texas. Temperatures by Thursday morning could be in the upper 20s to lower 30s area wide bringing the first widespread freeze to East Texas.
Thursday, November 19, 2009
Remembering Dr. Fujita
Eleven years ago today the world lost one of the great contributors to the science of meteorology, Dr. Tetsuya Theodore Fujita. Dr. Fujita’s tornado research would later lead to what is now known as the Enhanced Fujita Scale, or EF scale. His original scale of tornado intensity, known as the Fujita Scale, ranged from F-0 to F-12(as seen below).
Through further research based on his findings, this scale was later enhanced and implemented in February of 2007.
Dr. Fujita also studied downbursts and microbursts which eventually lead to a better understanding of how these phenomenons can cause air disasters. He studied two of the most noted airline crashes caused in and around thunderstorms, the 1975 crash of Eastern Airlines flight 66 which crashed at JFK airport killing 122 people and the 1985 crash of Delta flight 191 at Dallas-Fort Worth killing 135 people. It was shortly after Delta flight 191 the Dr. Fujita published is work on the study of microbursts and downbursts which has more than likely saved countless lives.
For more on Dr. Fujita please read the tribute from Stormtrack.org here.
Friday, November 13, 2009
Warm weather comes to an abrupt end next week
So far the month of November has been warm and dry giving us a chance to dry out from October’s deluge. Normally by now many areas of East Texas would have already experienced their first frost but this November we have been above normal temperature wise delaying the onset of frost and freezing temperatures. It looks as though this spell of mild weather will come to an abrupt end next week. A strong cold front in association with an area of low pressure will bring a chance of showers and thunderstorms late Sunday into Monday followed by much cooler weather. Right now it appears the area of low pressure will stall to our northeast Tuesday keeping cloudy and windy conditions and maybe even a sprinkle or two. The big story will be the temperatures behind the front. High temperatures Tuesday will struggle to reach the middle 50s thanks to lingering cloud cover. As the low finally moves away from the area Tuesday night, clouds should decrease and winds will die down. This is the perfect set up for what we call radiational cooling, were the Earth’s heat is able to escape the atmosphere causing rapid cooling after sunset. Right now it looks as though in our normally cooler locations, temperatures will be able to drop into the lower to middle 30s. This would produce frost in these areas for the first time this year. Right now we are calling for temperatures in the upper 30s to low 40s but looking at the raw data coming late this morning, a frost appears likely for some areas next week. So get ready for some big changes across East Texas.
Remembering one of the worst tornado outbreaks in East Texas
Sunday will mark the 22nd anniversary of one of the biggest tornado outbreaks in the History of East Texas. On this day, four long track F3 tornadoes moved across parts of East Texas and a total of 50 tornadoes occurred over a 48 hour period from the Southern Plains to the Southeast United States. One of the most noted tornadoes was the F3 that caused considerable damage to Palestine in Anderson County. This tornado was on the ground for 11 miles and unfortunately claimed one life and injured 59 other people.
The most tragic tornado of the day tracked through Cherokee and Smith counties through Jacksonville, Mixon, and Whitehouse. This tornado was on the ground for 33 miles, claimed 4 lives, and injured an additional 81 people. Based on times and tracks , this tornado appears to be the second tornado in East Texas and fourth overall produced by a single supercell thunderstorm that developed along a dryline in Central Texas. This storm appears to have gone on to produce a total of eleven tornadoes including another F3 tornado in Cass County near Marietta, making a total of four F3 tornadoes from a single thunderstorm.
Later, in the early evening hours, another supercell developed near Lufkin and moved to the northeast. This storm would go on to produce a long track F3 tornado near Center in Shelby County and continue northeast through southeastern Panola County into Louisiana. Thankfully this tornado caused no deaths in East Texas but it did injure 15 people.
Unfortunately since this event happened before the internet age, there is very little information. A matter of fact, this may be one of the largest tornado outbreaks with very little research or information available. I would like to change that. Over the next few weeks I plan on researching this event to find out as much information as possible. For one thunderstorm to produce eleven tornadoes is a very unusual and extreme event. If you have any images or stories of this event you would like to share, please email them to me. With your help, we can learn more about the environment that lead to such a tragic event.
email: gdade@kltv.com
The most tragic tornado of the day tracked through Cherokee and Smith counties through Jacksonville, Mixon, and Whitehouse. This tornado was on the ground for 33 miles, claimed 4 lives, and injured an additional 81 people. Based on times and tracks , this tornado appears to be the second tornado in East Texas and fourth overall produced by a single supercell thunderstorm that developed along a dryline in Central Texas. This storm appears to have gone on to produce a total of eleven tornadoes including another F3 tornado in Cass County near Marietta, making a total of four F3 tornadoes from a single thunderstorm.
Later, in the early evening hours, another supercell developed near Lufkin and moved to the northeast. This storm would go on to produce a long track F3 tornado near Center in Shelby County and continue northeast through southeastern Panola County into Louisiana. Thankfully this tornado caused no deaths in East Texas but it did injure 15 people.
Unfortunately since this event happened before the internet age, there is very little information. A matter of fact, this may be one of the largest tornado outbreaks with very little research or information available. I would like to change that. Over the next few weeks I plan on researching this event to find out as much information as possible. For one thunderstorm to produce eleven tornadoes is a very unusual and extreme event. If you have any images or stories of this event you would like to share, please email them to me. With your help, we can learn more about the environment that lead to such a tragic event.
email: gdade@kltv.com
Wednesday, November 11, 2009
The November 11th Blue Norther of 1911
On November 11th, 1911, an intense area of low pressure developed over the Midwest leading to extreme weather across a good deal of the nation. Many areas of the country saw record warmth late that afternoon only to be shocked by the intense arctic blast to follow hours later. In Oklahoma City, a record high of 82°F was set in the afternoon before a cold front raced through the area. Just before midnight, the temperature was 16°F establishing a new record low for the same date. Other Cities such as Springfield, MO set record highs in the 80s that afternoon followed by record lows in the teens just before midnight.
Take a look at some of these temperature extremes from highs on the 11th to lows on the 12th:
Oklahoma City 82°F/14°F
Amarillo, TX 70°F/10°F
Palestine, TX 82°F/28°F
Springfield, MO 80°F/8°F
Fort Worth, TX 86°F/20°F
So why the big difference in temperatures? The image at the top shows the weather map for the morning of November 11th, 1911. You will notice an intense area of low pressure developing across northwest Missouri at this time. This low brought with it a large amount of warm moist air that would lead to severe thunderstorms, as I will discuss farther down, but also brought with it dry air as winds blew down the front range of the Rockies causing a dryline to form from Oklahoma down into Texas. The air mass behind this dry line was still out ahead of the main cold front so temperatures were allowed to soar. Much of southwestern Missouri, Oklahoma, and Texas were in this warm dry air mass with temperatures soaring into the 80s to near 90 in a few locations. Shortly after sunset the arctic front raced through these same areas causing temperatures to plummet, as much as 30°F in one hour. It was the unique combination of warm dry air ahead of a fast moving cold front which allowed such a large range of temperatures to occur on the 11th.
In addition to the significant temperature change, an outbreak of severe weather occurred across parts of the Midwest. Numerous tornadoes were reported across Indiana, Illinois, Michigan, and Wisconsin. An F2 tornado hit Waterloo, IN and 2 people were killed in Michigan with tornadoes. The strongest tornado was in Jamesville, WI where an F4 tornado killed 9 people. Less than an hour later blizzard conditions with wind chill temperatures near 0°F were hampering the cleanup efforts.
Monday, November 9, 2009
Ida Now A Tropical Storm
Ida moved back into the warmer waters of the Caribbean Sea late Saturday and re intensified to a hurricane yesterday. Ida reached its peak intensity yesterday at 6PM when the top winds reached 105 mph, making Ida a category two storm. Ida's top winds continue to decrease now as it enters the northern Gulf of Mexico where water temperatures are much cooler. As of this update top winds were 70 mph making Ida a strong tropical storms before making landfall along the north central Gulf Coast. Some continental, drier air will also wrap into the system causing Ida to lose her tropical characteristics. Very heavy rain and isolated tornadoes can be expected along the central Gulf Coast over the next couple of days along with very gusty winds. The current forecast track is below and will update as new advisories are released.
Thursday, November 5, 2009
Ida Could Be Heading For The Gulf.
The 2009 Hurricane season does not want to end just yet. Our ninth named tropical system has now made landfall in Nicaragua as Hurricane Ida. In the process, Ida became one of the fastest developing tropical systems on record becoming a hurricane in just 24 hours. The fastest system to develop from depression to hurricane occurred two years ago off the Texas Gulf coast, Hurricane Humberto.
Now that Ida has made landfall, she will rapidly decrease in strength over Nicaragua and Honduras and will more than likely become a depression tonight. By Friday afternoon we expect Ida to move back into the Caribbean Sea and once again reach tropical storm status. Notice the current forecast track. The center of Ida comes very close to hitting the Yucatan Peninsula by Monday morning. If Ida remains over warm water, she could once again become a hurricane as she enters the Gulf.
The good news for Texas, it looks as though a cold front that will move through the area Monday will help steer Ida of to the east. Areas along the Gulf Coast from Alabama to the Florida Keys should pay very close attention to Ida as this appears to be the most likely area of landfall next week.
Saturday, October 31, 2009
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