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May 21-22 Midwest & Great Lakes Severe Threat


SEMIweather

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Day 2 SPc outlook is out.

Basically the orientation of the outlook is a little more SW-NE looking, there's a tiny moderate risk area over Oklahoma and the 30% areas has been expanded NE through Central/Southern Indiana and West Central Ohio.

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Just pushed out my 18Z Severe Weather Analysis. Highest instability areas are running in areas of Mena, AR-Bloomington, IL, San Angelo, TX-Talequah, OK-Joplin, MO and Coffeyville, KS, which has the highest instability values. 18Z average surface based CAPE's are running around 3000 j/kg, 0-1KM EHI are strong at around 4.0, and the 0-3KM Shear are running around 35 to 40 knots. Also seeing potential for 70-80 knots and hail up to 3" in diameter. Analysis uploaded at http://smartwxmodel.net

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It's always something around here. Now, it's the dewpoints that are struggling to rise, despite full sunshine. Although temps have risen to around 80, the dewpoints have stayed in the 50s, except in the lakeshore counties.

Dewpoints will often drop with diurnal heating, as drier air above the surface gets mixed down.

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So are we expecting supercells ahead of the derecho/line here in se mi.

So far, it's looking like we're going to get split in the central portion of the area by this initial round, granted some CU is starting to develop now in SW Michigan.

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PRELIMINARY LOCAL STORM REPORT

NATIONAL WEATHER SERVICE GAYLORD MI

314 PM EDT SUN MAY 22 2011

..TIME.. ...EVENT... ...CITY LOCATION... ...LAT.LON...

..DATE.. ....MAG.... ..COUNTY LOCATION.. ST.. ...SOURCE....

..REMARKS..

0220 PM HAIL BURT LAKE 45.43N 84.72W

05/22/2011 M2.00 INCH CHEBOYGAN MI BROADCAST MEDIA

REPORT FROM SOUTH END OF BURT LAKE...IRREGULAR SIZED 2

INCH HAIL. REPORT FROM PUBLIC THROUGH MEDIA.

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