Henry Margusity

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Northwesterly Flow Severe Weather Outbreak

July 23, 2012; 8:07 AM ET


For the Northeast into the southern Ohio Valley, today will be a northwesterly flow severe weather outbreak. What is a NW Flow Severe Weather Outbreak? It's where the jest stream is from the NW aloft and winds at the surface are from the SW. Warm and humid air is transported under the jet resulting in a very unstable atmosphere. In addition, you have shear that develops between the SW winds and NW winds aloft which may support supercell thunderstorms and the potential for tornadoes.

While I think the main impacts will be wind damage and hail, I do think we can see a few tornadoes across Pennsylvania, West Virginia, southern Ohio, Kentucky and perhaps even parts of Virginia.

I did see while writing this that SPC extended the slight risk into the big cities.

The views expressed are those of the author and not necessarily those of AccuWeather, Inc. or AccuWeather.com


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Henry Margusity
AccuWeather.com severe weather expert, Henry Margusity, offers the Meteorological Madness blog including detailed analysis of severe weather across the US.