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Posted at 02:27 PM ET, 03/01/2012

Major Tennessee Valley severe weather, tornado outbreak possible Friday


Risk of severe thunderstorms Friday. (NOAA SPC)
Reeling from destructive thunderstorms and tornadoes on Wednesday, the Tennessee Valley is bracing for another round of severe weather Friday.

NOAA’s Storm Prediction Center (SPC) indicates thunderstorms are possible over a large portion of the eastern third of the U.S. But chances for significant severe weather are highest from northern Mississippi and Alabama through southern Indiana and Ohio. This area has a moderate risk of severe thunderstorms SPC says:

THREATS FOR BOTH DAMAGING WINDS AND SEVERAL TORNADOES APPEARS EVIDENT ... ACCOMPANYING THE LIKELIHOOD FOR LARGE HAIL. A COUPLE OF STRONG TORNADOES WILL ALSO BE POSSIBLE -- MAINLY DURING THE MID TO LATE AFTERNOON HOURS IN AND NEAR THE MODERATE RISK AREA.


A NOAA visualization of the NAM model which shows a high probability of thunderstorm activity from the Gulf of Mexico into Ohio. (NOAA Environmental Visualization Laboratory)
The Original Weather Blog describes a threat for “potentially long track tornadoes” in this region, that includes the following cities:

Tupelo, Tuscaloosa, Birmingham, Huntsville, Nashville, Evansville, Louisville, Bowling Green, Cincinnati, Indianapolis and Columbus.

AccuWeather has expressed concern that Friday’s outbreak may be more severe than the one midweek.

Link: Killer storms slam Midwest

“The storms ... may be stronger and may cover a larger and more heavily populated area from the Midwest to the South,” it said.

The midweek storms led to 20 tornado reports and 13 deaths, including four in Kentucky and Tennessee, which may be under the gun Friday.

The trigger for the possible severe weather outbreak is a large dip in the jet stream digging into the central U.S., drawing in cold, Arctic air from the north. Very warm moist air is running out ahead of it. It’s the transition zone between the cold and the warm where a volatile mix of air will set off the potentially violent storms.

Residents in and near the slight and moderate thunderstorm risk area should stay alert for possible severe weather watches and warnings.

Related: Severe weather tips | Weather Ready Nation

By  |  02:27 PM ET, 03/01/2012

Categories:  Latest, U.S. Weather

 
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