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A tale of two lows and an Arctic airmass


Jeb
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From snow to severe

10:45 A.M. ET 12/22/2004

 

Kevin Roth, Senior Meteorologist, The Weather Channel

 

 

Low pressure is taking shape in the western Gulf of Mexico and is forecast to lift northward and be near Pittsburgh, Pennsylvania by Thursday morning. During the day Thursday the low should kick into eastern Canada and then off the move into the northern Atlantic by Thursday night. Arctic air surging southeastward from the Plains meets up with the storms moisture along the Ohio River southwest to Texas. A band of mostly snow has broken out from the eastern Great Lakes southwest through the Ohio Valley. A second area of snow picks up over the southern Plains and Texas. These two areas should combine this afternoon to produce one long moderate to heavy snow band. Accumulations by Thursday morning are expected to be 6 to 15 inches from Cleveland southwest to Evansville, Indiana. Up to an inch of slushy snow is possible as far south as Dallas.

 

There is a warm side to this storm and it could produce some severe thunderstorms this afternoon and evening. The greatest risk of a severe thunderstorm is in western Alabama, central and southern Mississippi, southern Louisiana and southeastern Texas. Damaging wind gusts would be the biggest threat from the thunderstorms, but isolated tornadoes cannot be ruled out. In addition to the severe threat, heavy rainfall is also likely in the warm sector. Localized flooding is possible from eastern Kentucky south to Georgia and west to southern Texas with some areas picking up more than 2 inches of rainfall.

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