Monday, July 22, 2013

Mesoscale Discussion 21:09:43.7542116

AREAS AFFECTED...SRN WI...NRN IL

CONCERNING...SEVERE THUNDERSTORM WATCH 434...

VALID 230208Z - 230315Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 434
CONTINUES.

SUMMARY...THUNDERSTORM POTENTIAL IS EXPECTED TO INCREASE OVER THE
NEXT FEW HOURS ALONG THE WI/IL BORDER. LOCALLY DAMAGING WINDS AND
MARGINALLY SEVERE HAIL ARE THE PRIMARY THREATS.

DISCUSSION...A SLOWLY EXPANDING PRECIP SHIELD SHOULD ENCOURAGE A
COLD POOL THAT WILL DRIVE CONVECTION EWD ALONG THE WI/IL BORDER INTO
THE LATE EVENING HOURS. WHILE OVERALL INTENSITY MAY SUBSIDE A
BIT...RESULTING IN MORE MARGINAL HAIL...LOCALLY DAMAGING WINDS MAY
ACCOMPANY N-S LINE SEGMENT AS IT PROGRESSES INTO NWRN IL AT ROUGHLY
35KT. THIS ACTIVITY MAY EVENTUALLY APPROACH THE WRN CHI METRO BUT
SEVERE THREAT IS EXPECTED TO BE CONSIDERABLY LESS BY THAT TIME.

..DARROW.. 07/23/2013

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...LOT...MKX...DVN...ARX...

LAT...LON 43019000 42648810 41888827 41278958 41639135 43019000