SPC MD 1011



MD 1011 CONCERNING SEVERE THUNDERSTORM WATCH 305… FOR NORTHERN AND NORTHEASTERN ILLINOIS

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Mesoscale Discussion 1011
NWS Storm Prediction Center Norman OK
0606 PM CDT Fri Jun 26 2020

Areas affected...Northern and northeastern Illinois

Concerning...Severe Thunderstorm Watch 305...

Valid 262306Z - 270030Z

The severe weather threat for Severe Thunderstorm Watch 305
continues.

SUMMARY...A tornado or two is possible in the next 2 hours from
northern Illinois into the Chicago metro area.

DISCUSSION...A cluster of storms moving across northern Illinois has
remained messy over the past 2 hours. However, the storm on the
southern end of this cluster (currently in DeKalb county as of 23Z)
has shown some persistent mid-level rotation. The airmass east of
this storm is cooler (upper 70s), but it has not mixed out and
dewpoints remain in the low 70s and surface winds remain mostly
southerly. Therefore, locally enhanced 0-1 km SRH in this region
(200 m2/s2 per LOT VWP) may lead to a locally maximized tornado
threat in the next 2 hours.

..Bentley.. 06/26/2020

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...LOT...

LAT...LON   42178916 42278855 42308770 41918741 41728759 41638810
            41728888 41818910 42008917 42178916 

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