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Virtual Chase Thread 2011

Paul Sherman
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NL Aficionado

NL

Posted
  • Location: South Shields Tyne & Wear half mile from the coast.
  • Location: South Shields Tyne & Wear half mile from the coast.
Posted

Smaller cell just below the main cell now going through Waco has started to intensify and has developed good structure.

post-5386-0-56189200-1303769768_thumb.jp

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Adi F Enthusiast

Adi F

Posted
  • Location: Chichester, West Sussex
  • Location: Chichester, West Sussex
Posted

LOL Gene Yates windscreen has just been popped by hail.

God knows why he has driven up through the hail core he was well placed earlier down on the SW right on the edge of the cell but then decided to shoot up north.

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Nick F Maestro

Nick F

Posted
  • Location: Caterham-on-the-hill, Surrey, 190m asl (home), Heathrow (work)
  • Location: Caterham-on-the-hill, Surrey, 190m asl (home), Heathrow (work)
Posted

Sounds like a rain-wrapped tornado beneath the storm south of DFW now with 100mph winds, near Blooming Grove heading east towards I-45 and Corsicana!

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Adi F Enthusiast

Adi F

Posted
  • Location: Chichester, West Sussex
  • Location: Chichester, West Sussex
Posted

Yeah it looks as if Kris Hair is trying to get into position on it, Cant see the the tornado yet but can see the wall cloud.

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Nick F Maestro

Nick F

Posted
  • Location: Caterham-on-the-hill, Surrey, 190m asl (home), Heathrow (work)
  • Location: Caterham-on-the-hill, Surrey, 190m asl (home), Heathrow (work)
Posted

Tornado warning for Corsicana area:

BULLETIN - EAS ACTIVATION REQUESTED

TORNADO WARNING

NATIONAL WEATHER SERVICE FORT WORTH TX

541 PM CDT MON APR 25 2011

THE NATIONAL WEATHER SERVICE IN FORT WORTH HAS ISSUED A

* TORNADO WARNING FOR...

SOUTHEASTERN ELLIS COUNTY IN NORTH CENTRAL TEXAS...

NAVARRO COUNTY IN NORTH CENTRAL TEXAS...

WESTERN HENDERSON COUNTY IN NORTHEAST TEXAS...

* UNTIL 630 PM CDT

* AT 539 PM CDT...A SEVERE THUNDERSTORM WITH A HISTORY OF PRODUCING

TORNADOES WAS NEAR EMHOUSE...MOVING EAST AT 45 MPH. WINDS OF UP TO

100 MPH HAVE BEEN REPORTED WITH THIS STORM. TAKE THE APPROPRIATE

PRECAUTIONS IMMEDIATELY!!

* THE TORNADO WILL BE NEAR...

CORSICANA...RETREAT...RICE AND OAK VALLEY AROUND 545 PM CDT...

MUSTANG...ANGUS AND RICHLAND AROUND 550 PM CDT...

POWELL...MILDRED AND NAVARRO AROUND 555 PM CDT...

THIS WILL IMPACT THE FOLLOWING INTERSTATES...

I-35E BETWEEN MILE MARKERS 9 AND 16...

I-45 BETWEEN MILE MARKERS 213 AND 253.

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Gorky Contributor

Gorky

Posted
  • Location: Scarborough, North Yorkshire - 80m ASL
  • Weather Preferences: Tornadoey
  • Location: Scarborough, North Yorkshire - 80m ASL
Posted

Very strong couplet went between Vilonia and Beryl just recently. Classic signs of a potentially violent tornado.

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Gorky Contributor

Gorky

Posted
  • Location: Scarborough, North Yorkshire - 80m ASL
  • Weather Preferences: Tornadoey
  • Location: Scarborough, North Yorkshire - 80m ASL
Posted

Reports that a Half mile wide tornado went through the western outskirts of Vilonia.... not good...

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Paul Sherman Veteran

Paul Sherman

Posted
  • Location: Leigh On Sea - Essex & Tornado Alley
  • Location: Leigh On Sea - Essex & Tornado Alley
  • Author
Posted

Heads up for an Upgrade to HIGH Risk for today from NE Texas, SE Oklahoma across most of Arkansas :help:

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NL Aficionado

NL

Posted
  • Location: South Shields Tyne & Wear half mile from the coast.
  • Location: South Shields Tyne & Wear half mile from the coast.
Posted

Heads up for an Upgrade to HIGH Risk for today from NE Texas, SE Oklahoma across most of Arkansas :help:

Just been reading about todays severe outbreak and thought this is going to go High risk.

Heres what 28storms.com have to say...

Tuesday

As the jet streak dives into the base of the trough, it will lead to very strong divergence over Arkansas. This will help provide sufficient lift for the development of severe thunderstorms by the late afternoon and early evening.

The initial wave that affected the region Monday evening should be well out of the area by Tuesday morning. This will help the airmass to quickly recover and become primed once again for severe thunderstorms including strong tornadoes, large hail, and damaging winds.

Shear looks very supportive for the development of supercells, initially. Bulk shears are expected around 50-60 knots (threshold for supercells is >40 knots). Furthermore, shear vectors will be nearly perpendicular to the frontal boundary. This allows storms to be more discrete because the downdrafts and updrafts are better separated from other storms. In addition, low-level shear will rapidly ramp up during the evening hours (similar to Monday evening). 0-1km helicites will quickly become >200m2/s2 in response to a strengthening low-level jet. Also, surface winds will begin to back out of the Southeast in response to the developing surface low. Hodographs are showing a very pronounced looping pattern, which signifies strong directional shear. Furthermore, these ingredients for shear are all conducive for significant tornadoes.

post-5386-0-26828800-1303806181_thumb.jp

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Paul Sherman Veteran

Paul Sherman

Posted
  • Location: Leigh On Sea - Essex & Tornado Alley
  • Location: Leigh On Sea - Essex & Tornado Alley
  • Author
Posted

Yep looking amazing, ALL Parameters are coming together for Discrete Long tracked Tornadic Storms.

My target today is between De Queen and Texarkana on the US 59 Highway.

Storms should fire around 23-00z and stay discrete, LCL's are very low and these storms should initially track to the NE But turn very quickly to the East. Only problem could be the HP Nature once again.

Paul S

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NL Aficionado

NL

Posted
  • Location: South Shields Tyne & Wear half mile from the coast.
  • Location: South Shields Tyne & Wear half mile from the coast.
Posted

Reports of two deaths in Vilonia Arkansas as a tornado ripped through part of downtown.

http://thecabin.net/news/local/2011-04-25/severe-storm-%E2%80%98wipes-out%E2%80%99-area-vilonia

post-5386-0-42336600-1303807004_thumb.jp

Radar 3D of Vilonia Tornado

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Gorky Contributor

Gorky

Posted
  • Location: Scarborough, North Yorkshire - 80m ASL
  • Weather Preferences: Tornadoey
  • Location: Scarborough, North Yorkshire - 80m ASL
Posted

Not surprising with regards to Vilonia. That radar presentation was about as scary as they get. I honestly expected to wake up to news of more victims. The town is spread out east-west and there was no way that storm was getting by without impacting at least part of the town. Looked like it went through about 3 miles W of the downtown area, from the radar but with storm tilt that could be out by a bit. Reports of businesses right in downtown destroyed doesn't match up with the radar unless this was a very large tornado or had a very damaging RFD wrapping around it, otherwise.

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gpspete Rookie

gpspete

Posted
  • Location: Bicester Oxfordshire
  • Location: Bicester Oxfordshire
Posted (edited)

just been looking at the radar and sattelite pics still some severe storms about the storms that effected DFW area are just about to clear the coast east of Houston the storms further north are pushing well east now so the air looks to be clearing for lots of convection to get going another big day in prospect i think there may be cells kicking off early again today

i would head for NE. texas and take it from there as the nowcasts come in i dont want to be too far north though as want to catch the tail end storms or anything that breaks out of the lineup

post-9919-0-24300100-1303813513_thumb.jp

Edited by gpspete
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NL Aficionado

NL

Posted
  • Location: South Shields Tyne & Wear half mile from the coast.
  • Location: South Shields Tyne & Wear half mile from the coast.
Posted

The couplet on the radar of the tornado that struck Vilonia is quite incredible, debris ball shows up very clearly.

post-5386-0-18086400-1303812931_thumb.pn

videos of the storm that dropped a huge wedge tornado on Vilonia Arkansas.

http://www.youtube.com/watch?v=d73FKIXKLqE

http://www.youtube.com/watch?v=rN4z6HQjZzM&feature=youtube_gdata_player

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Muffelchen Enthusiast

Muffelchen

Posted
  • Location: Beverley, E Yorks, 19m ASL
  • Weather Preferences: Snow, Thunder - not necessarily at the same time!
  • Location: Beverley, E Yorks, 19m ASL
Posted

The couplet on the radar of the tornado that struck Vilonia is quite incredible, debris ball shows up very clearly.

post-5386-0-18086400-1303812931_thumb.pn

I think that is the best radar presentation I have ever seen of a tornado. It is incredible.

Really sorry to hear about the victims in Vilonia. The more we understand these things, the better and more timely warnings we can give. This is what needs to be remembered when lives are lost.

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Nick F Maestro

Nick F

Posted
  • Location: Caterham-on-the-hill, Surrey, 190m asl (home), Heathrow (work)
  • Location: Caterham-on-the-hill, Surrey, 190m asl (home), Heathrow (work)
Posted

Sobering stuff looking at the reports and footage from the Vilonia tornado damage path. Difficult chase terrain in NW Arkansas where Vilonia is too with all those hills and woods, certainly difficult for those chasers keeping a safe distance with failing light and difficult visual behind trees and hills, looks like they caught some RFD or circulation in the 3rd video posted by NL.

Also Fantastic example of the couplet, shows clearly the wind velocities moving different directions and the debris ball!

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gpspete Rookie

gpspete

Posted
  • Location: Bicester Oxfordshire
  • Location: Bicester Oxfordshire
Posted (edited)

this morning when checking out the damage on little rock news stations there was some pictures by one of there stormreporters trapped in a traffic jam stretching back over 2 miles

caused by drivers sheltering under a bridge he had to sit it out in the storm with lots of others unable to drive away it looks like those under the bridge where well out of it !

Edited by gpspete
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DubWeatherAddict Rookie

DubWeatherAddict

Posted
  • Location: Dublin
  • Location: Dublin
Posted

this morning when checking out the damage on little rock news stations there was some pictures by one of there stormreporters trapped in a traffic jam stretching back over 2 miles

caused by drivers sheltering under a bridge he had to sit it out in the storm with lots of others unable to drive away it looks like those under the bridge where well out of it !

This i cannot believe.... why do People come to believe that under a bridge is safe?:fool:.... simple laws of physics prove that anything pressurised into a smaller space will speed up!... If i blow into a straw gently, the force on the opposite end of the straw will be high.... :wallbash:

But i suppose they dont really get time to think about the wonderfull world of physics!...:whistling:

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Dorsetbred Maestro

Dorsetbred

Posted
  • Location: Poole, Dorset 42m ASL
  • Location: Poole, Dorset 42m ASL
Posted

This i cannot believe.... why do People come to believe that under a bridge is safe?:fool:.... simple laws of physics prove that anything pressurised into a smaller space will speed up!... If i blow into a straw gently, the force on the opposite end of the straw will be high.... :wallbash:

But i suppose they dont really get time to think about the wonderfull world of physics!...:whistling:

Back to the caveman instinct, of having a strong roof over your head!

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NL Aficionado

NL

Posted
  • Location: South Shields Tyne & Wear half mile from the coast.
  • Location: South Shields Tyne & Wear half mile from the coast.
Posted

This i cannot believe.... why do People come to believe that under a bridge is safe?:fool:.... simple laws of physics prove that anything pressurised into a smaller space will speed up!... If i blow into a straw gently, the force on the opposite end of the straw will be high.... :wallbash:

But i suppose they dont really get time to think about the wonderfull world of physics!...:whistling:

Most weren't aware of any tornadoes in the area, they were sheltering from the 'golf ball' sized hail.

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NL Aficionado

NL

Posted
  • Location: South Shields Tyne & Wear half mile from the coast.
  • Location: South Shields Tyne & Wear half mile from the coast.
Posted · Hidden by NL, April 26, 2011 - Unwanted stuff
Hidden by NL, April 26, 2011 - Unwanted stuff

Death toll from yesterdays tornadoes in Arkansas has risen to 7 according to emergency officials. Four deaths were directly from the 'Vilonia' tornado and three from flash flooding.

http://arkansasmatters.com/news-fulltext/?nxd_id=416507

As suspected todays risk SPC have issued a HIGH RISK in their latest update.

post-5386-0-86829900-1303821895_thumb.gi

usagov_logo_color_110w_30h.gif

<a href="http://www.spc.noaa.gov/products/outlook/day2otlk.html">Day 2 Outlook > Apr 26, 2011 1300 UTC Day 1 Convective Outlook Updated: Tue Apr 26 12:39:04 UTC 2011 (Print Version) Probabilistic to Categorical Outlook Conversion Table Public Severe Weather Outlook The SPC is forecasting ...outbreak of severe storms and tornadoes expected over parts of the southern plains and lower mississippi valley this evening and overnight.... Please read the latest public statement about this event.

Categorical Tornado Wind Hail Population Cities/Towns CWAs Interstates Counties map_background.gifpopulation.gifcounty.gifcwa.gifinterstate.gifcities.gifday1otlk_1300.gif Categorical Day1 1300Z Outlook

For best viewing experience, please enable browser JavaScript/Active Scripting. Forecast Discussion SPC AC 261234

DAY 1 CONVECTIVE OUTLOOK

NWS STORM PREDICTION CENTER NORMAN OK

0734 AM CDT TUE APR 26 2011

VALID 261300Z - 271200Z

...THERE IS A HIGH RISK OF SVR TSTMS LATE THIS AFTERNOON INTO

TONIGHT FOR NE TX...FAR SE OK...EXTREME NW LA...AND THE SRN HALF OF

AR...

...THERE IS A MDT RISK OF SVR TSTMS SURROUNDING THE HIGH RISK...FROM

NE TX/SE OK TO THE CONFLUENCE OF THE MS/OH RIVERS...

...THERE IS A SLGT RISK OF SVR TSTMS IN A BROAD SWATH FROM THE SRN

PLAINS EWD/NEWD TO THE MS/OH VALLEYS AND THE LOWER GREAT LAKES...

...DANGEROUS TORNADO AND SEVERE THUNDERSTORM OUTBREAK EXPECTED LATE

THIS AFTERNOON INTO TONIGHT FROM NE TX ENEWD TO THE MS RIVER...

...SYNOPSIS...

AN INITIAL SHORTWAVE TROUGH OVER MO/IL WILL EJECT NEWD TOWARD LOWER

MI TODAY...WHILE AN INTENSE UPSTREAM JET STREAK PROGRESSES ESEWD TO

THE SRN PLAINS BY TONIGHT. MORNING SUBSIDENCE OVER AR /IN THE WAKE

OF THE DEPARTING WAVE/ WILL BE REPLACED BY ASCENT BEGINNING ALONG

THE RED RIVER VALLEY OF N TX/SRN OK LATER THIS AFTERNOON...SPREADING

EWD THIS EVENING INTO SE OK/NE TX AND SRN AR OVERNIGHT. A STRONG

SURFACE CYCLONE WILL DEVELOP EWD ALONG THIS SAME CORRIDOR IN

RESPONSE TO STRONG UPPER DIVERGENCE IN THE LEFT EXIT REGION OF THE

90-100 KT MIDLEVEL JET. THE CYCLOGENESIS WILL ALSO PROMOTE THE

DEVELOPMENT OF A STRENGTHENING SLY/SSWLY LLJ FROM THE ARKLATEX TO

THE LOWER MS VALLEY OVERNIGHT. MEANWHILE...RICH BOUNDARY LAYER

MOISTURE ACROSS E TX...BENEATH A PLUME OF STEEP MIDLEVEL LAPSE RATES

ORIGINATING TO THE W...WILL PROVIDE MODERATE-STRONG WARM SECTOR

INSTABILITY IN ADVANCE OF THE DEVELOPING CYCLONE. THE NET RESULT

WILL BE A STRONGLY SHEARED AND UNSTABLE WARM SECTOR LATE THIS

AFTERNOON INTO TONIGHT...WHICH APPEARS SUPPORTIVE OF A DANGEROUS

TORNADO AND SEVERE THUNDERSTORM OUTBREAK.

http://www.spc.noaa.gov/products/outlook/day1otlk.html

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NL Aficionado

NL

Posted
  • Location: South Shields Tyne & Wear half mile from the coast.
  • Location: South Shields Tyne & Wear half mile from the coast.
Posted

SPC have issued high risk.

post-5386-0-39368600-1303822134_thumb.gi

http://www.spc.noaa.gov/products/outlook/day1otlk.html

DAY 1 CONVECTIVE OUTLOOK

NWS STORM PREDICTION CENTER NORMAN OK

0734 AM CDT TUE APR 26 2011

VALID 261300Z - 271200Z

...THERE IS A HIGH RISK OF SVR TSTMS LATE THIS AFTERNOON INTO

TONIGHT FOR NE TX...FAR SE OK...EXTREME NW LA...AND THE SRN HALF OF

AR...

...THERE IS A MDT RISK OF SVR TSTMS SURROUNDING THE HIGH RISK...FROM

NE TX/SE OK TO THE CONFLUENCE OF THE MS/OH RIVERS...

...THERE IS A SLGT RISK OF SVR TSTMS IN A BROAD SWATH FROM THE SRN

PLAINS EWD/NEWD TO THE MS/OH VALLEYS AND THE LOWER GREAT LAKES...

...DANGEROUS TORNADO AND SEVERE THUNDERSTORM OUTBREAK EXPECTED LATE

THIS AFTERNOON INTO TONIGHT FROM NE TX ENEWD TO THE MS RIVER...

...SYNOPSIS...

AN INITIAL SHORTWAVE TROUGH OVER MO/IL WILL EJECT NEWD TOWARD LOWER

MI TODAY...WHILE AN INTENSE UPSTREAM JET STREAK PROGRESSES ESEWD TO

THE SRN PLAINS BY TONIGHT. MORNING SUBSIDENCE OVER AR /IN THE WAKE

OF THE DEPARTING WAVE/ WILL BE REPLACED BY ASCENT BEGINNING ALONG

THE RED RIVER VALLEY OF N TX/SRN OK LATER THIS AFTERNOON...SPREADING

EWD THIS EVENING INTO SE OK/NE TX AND SRN AR OVERNIGHT. A STRONG

SURFACE CYCLONE WILL DEVELOP EWD ALONG THIS SAME CORRIDOR IN

RESPONSE TO STRONG UPPER DIVERGENCE IN THE LEFT EXIT REGION OF THE

90-100 KT MIDLEVEL JET. THE CYCLOGENESIS WILL ALSO PROMOTE THE

DEVELOPMENT OF A STRENGTHENING SLY/SSWLY LLJ FROM THE ARKLATEX TO

THE LOWER MS VALLEY OVERNIGHT. MEANWHILE...RICH BOUNDARY LAYER

MOISTURE ACROSS E TX...BENEATH A PLUME OF STEEP MIDLEVEL LAPSE RATES

ORIGINATING TO THE W...WILL PROVIDE MODERATE-STRONG WARM SECTOR

INSTABILITY IN ADVANCE OF THE DEVELOPING CYCLONE. THE NET RESULT

WILL BE A STRONGLY SHEARED AND UNSTABLE WARM SECTOR LATE THIS

AFTERNOON INTO TONIGHT...WHICH APPEARS SUPPORTIVE OF A DANGEROUS

TORNADO AND SEVERE THUNDERSTORM OUTBREAK.

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