MESOSCALE DISCUSSION 1232
   NWS STORM PREDICTION CENTER NORMAN OK
   0947 PM CDT MON JUN 30 2014

   AREAS AFFECTED...PORTIONS OF NRN/CNTRL IL AND FAR NWRN INDIANA

   CONCERNING...SEVERE THUNDERSTORM WATCH 380...

   VALID 010247Z - 010415Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 380
   CONTINUES.

   SUMMARY...A DMGG-WIND RISK CONTINUES IN PORTIONS OF NRN IL. SVR
   STORMS WILL SPREAD EWD/SEWD INTO THE OVERNIGHT HOURS.

   DISCUSSION...A LINE OF SEVERE STORMS CROSSING NRN IL IS EXHIBITING
   AROUND 45 KT OF FORWARD MOTION...ADVANCING EWD/SEWD. DESPITE
   PORTIONS OF THE REGION HAVING EXPERIENCED EARLIER CONVECTIVE
   OVERTURNING...STRENGTHENING DEEP ASCENT AND AN INTENSIFYING LLJ ARE
   PROMOTING MODEST DESTABILIZATION. LOT VWP INDICATES STRONG DEEP
   SHEAR THAT WILL ALSO ENHANCE DYNAMIC PRESSURE PERTURBATIONS TO
   BOLSTER CONVECTION GIVEN ASCENT ON THE LEADING EDGE OF THE
   ESTABLISHED COLD POOL. DMGG WIND GUSTS ARE EXPECTED TO CONTINUE.
   THIS INCLUDES THE CHICAGO METRO AREA AROUND 0300-0330Z. ISOLATED
   MESOVORTICES/EMBEDDED SUPERCELLS COULD PRODUCE BRIEF TORNADOES ALONG
   THE LEADING CONVECTIVE LINE GIVEN 0-1-KM BULK SHEAR AROUND 30 KT.

   ..COHEN.. 07/01/2014


   ATTN...WFO...LOT...ILX...DVN...

   LAT...LON   40539089 41168952 41998791 41368715 40718770 40408906
               40539089