Winter Storm: Thu NIght UPDATE

 UPDATE: Thu 28 Jan 2010 / 10:45pm

The much-advertised winter storm has brought very heavy sleet and freezing rain from Tulsa to Oklahoma City to Lawton, but has yet to affect most of Texoma with travel troubles.
The system has slowed down, and this is allowing warm air to wrap around the top of the surface low from the east. At the same time, heavy rain falling from warmer air above further eroded the cold air at the surface.
This is why temperatures throughout Texoma were warmer at 9pm Thursday than they were at 5pm.
As the surface low moves slowly eastward, locally heavy rain…with some freezing rain over northernmost counties…will continue.
The circulation around the departing low will allow much colder air back into the area Friday. The maximum coverage for wintry precipitation is now expected between 6am and 6pm Friday, ending west to east during the afternoon and evening.
Some areas may receive significant snowfall, or sleet, before this quits Friday night.
Amounts listed below still look good; some areas may have up to 2" of snow by the time it's all done, although I suspect most of us will get less (as map shows).  


 Mon 25 Jan 2010 / 4:00pm

A drastic return to winter weather is in the offing for Thursday. A Winter Storm Watch has already been posted for much of Oklahoma, including almost all Texoma counties north of the Red.
Freezing rain, sleet and snow will likely affect various parts of the state beginning late Wednesday and through much of day Thursday.
The Texas regions of Texoma may also get some ice or snow on Thursday.
A pool of arctic air now over northern Canada will be pulled southward by a deep upper low pressure system; meanwhile, an upper trough will move along in the jet stream flow from the west.
While this is taking place, Gulf moisture will rapidly increase Wednesday, putting all of the ingredients in place for a major winter storm (see map below).
The track of the low has a great deal of influence on amount and type of precipitation, so we’ll need to keep close tabs on where it’s going; nevertheless, good model agreement points to a winter weather event for our area Thursday. 
Stay Warm and stay tuned…
Steve LaNore
Chief Meteorologist


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