Wednesday, April 17, 2013

Moderate Risk for Severe Thunderstorms Thursday/Friday

First, a Severe Thunderstorm Watch is now in effect for a portion of the CWA under Louisville NWS's responsibility till 10pm edt. Counties included are Meade, Breckinridge, and Hardin.

Now, turning attention to the main event, a squall line with possible tornadoes is forecast to impact parts of the region late Thursday/early Friday.

At the moment, far west Kentucky and far west Indiana are in the moderate shading. An upper-end slight risk shading exists for those areas along and just west of I-65.

Current thinking is that robust instability will work with the strong wind fields in place and produce a damaging squall line as it races eastward. However, as the nighttime hours progress, instability is expected to wane.

While that may happen, I do expect an eastward shift of the upper-end slight risk category to include areas along and west of I-75. Damaging winds are looking quite likely for many.

Power outages and downed lines and trees could make a mess of things as preparations for Thunder Over Louisville continue. Right now, we'll just have to wait for future developments as to the timing and strength of the storms that will affect the region.

MS

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