Tornado Hits Joy, OK: May 19


UPDATE: 19 May 2010 / 11:30p.m.

A damaging tornadic Supercell tracked about 80 miles from Duncan in Stephens County to Stonewall in eastern Pontotoc County Wednesday night.  Our own Doug Drace reported golfball hail from the storm in western Garvin County before the tornado formed..and saw it on the ground during a lightning flash at about 9p.. near Joy, OK.

Considerable damage was reported from the twister in Joy (Murray County).

The were also widespread reports of heavy rainfall, intense lightning, and hail to golfball size with this storm.

Meanwhile, other portions of Texoma received not so much as a drop of rain.

Such is the nature of severe storm formation and forecasting. For me, I'm glad it wasn't any easily could have been.

Take Care,

Steve LaNore
Chief Meteorologist



UPDATE: Wed 19 May 2010 / 1:36p.m.

Texoma is in a moderate to high risk area through Thursday morning (map above).

Huge hail is possible along with a significant tornado threat through late tonight.


             Increasing wind shear and lift provided by upper low are part of a new severe threat taking shape mid-week.

Mon 17 May 2010 / 6pm

A turbulent late spring pattern continues as we move deeper into May. The Storm Prediction Center (SPC) says there could be a “significant severe” scenario late Wednesday afternoon through the overnight hours, mainly west of I-35.
This is somewhat similar to the conditions preceding the major tornado outbreak of May 10:
1) Increasing low and mid-level wind shear by Wednesday morning (crossing of green and blue arrows)
2) Deep moisture source from the Gulf (green stream)
3) Well defined upper wave with jet stream support (big blue “L”)
Two factors that appear to be in question (compared to last week) are the timing of the upper wave’s passage, and the position of a surface dry line.
During last week’s event, the dry line punched well to the east and acted as a focusing point for storm growth, which was explosive. They began to fire along it by 4pm around Wichita Falls and Lawton. Racing along at 50-60mph, it didn’t take them long to get into Texoma from their starting point, and quickly become tornadic Supercells.
This time, the dry line will probably be about 100 miles further west, and steering winds will be slower. This means storms will probably arrive in Texoma after sunset, when the air is becoming a little more stable.
Secondly, if the upper wave comes in overnight this will also deprive the system of maximum lift; if it tracks a bit further north this would also lower the risk.
Despite these uncertainties, it seems that portions of Oklahoma and Texas will get some severe storms Wednesday into Thursday. 
So I’m not saying we’ll have a repeat of last week, but tornado-producing weather is a possibility for mid-week. Right now, the highest risk seems to be just to our west.
I’ll keep you posted with daily updates.
Take Care,
Steve LaNore
Chief Meteorologist
Below: Storms drop out of forecast once upper low axis moves to east.
This should happen by Friday morning at the latest.


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Comments are posted from viewers like you and do not always reflect the views of this station.
  • by Brandon Location: Sherman on May 22, 2010 at 12:30 PM
    GW2, the National Weather Service offers several severe weather classes prior to storm season. You don't really "have" to use equipment, but some equipment can be very helpful. It's really important to know a lot about weather and store development. You shouldn't just go out and storm spot/chase on your own to begin with. Contact me at and I can help you.
  • by Anonymous on May 20, 2010 at 12:57 PM
  • by Jimmy Location: Ntx on May 19, 2010 at 10:18 PM
    Good work
  • by Brandon Location: Sherman on May 19, 2010 at 01:28 PM
    Im currently set up in Pauls Valley Oklahoma. Currently breaking clouds and warming temperatures as the atmosphere becomes more unstable. Small popcorn thunderstorms to my northeast. Waiting for further developement. And Citizen, Madill Steve gave an update yesterday (thats 1 day ago) And he also updated his weather forecast and KXII posted a News story of a potential Severe weather outbreak across Texoma. Seems like pretty good coverage to me.... Anyway, watch out texoma, this could be a very dangerous situation for some locations! Good work Steve!
  • by Citizen Location: Madill on May 19, 2010 at 12:43 PM
    Well I was just wondering...He leave doubt as to whether it may not happen, lots of varaiables, but then not another word for two days...I was just quoting his blog...
  • by Lynn Location: Denison on May 19, 2010 at 12:43 PM
    Tornado watch out in northern Oklahoma is a PDS (particularly dangerous situation) watch. I agree that the set-up isn't as impressive as May 10th, but I don't think this event will be one to be trifled with either. Long night ahead for Texoma and Mr. LaNore. Keep up the good work sir!
  • by Brandon Location: Sherman on May 19, 2010 at 10:12 AM
    Citizen, Madill. He posted it Monday to give the general public an advance warning. As more information comes available he will update the blog, and also update his weather forecast.
  • by Citizen Location: Madill on May 19, 2010 at 07:28 AM
    "I’ll keep you posted with daily updates.", then why is the latest blog from Monday????
  • by GW2 Vet on May 19, 2010 at 06:31 AM
    where is a class to become a spotter and what equipment do i need to get started?? I treat storms like wild fires, i warn as many people as i can get in touch with because they all have dangerous potential.
  • by Bob Location: Lake - trained spotter on May 19, 2010 at 05:06 AM
    Looks like the morning storms in North Central OK will create the outflow boundary for for this afternoon/evening storms to form! Just what we need, more lift..
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