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Mesoscale Discussion 1220
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   MESOSCALE DISCUSSION 1220
   NWS STORM PREDICTION CENTER NORMAN OK
   0433 PM CDT MON JUN 30 2014

   AREAS AFFECTED...PORTIONS OF NORTHERN ILLINOIS AND SOUTHERN
   WISCONSIN

   CONCERNING...SEVERE THUNDERSTORM WATCH 375...

   VALID 302133Z - 302330Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 375
   CONTINUES.

   SUMMARY...WIDESPREAD DAMAGING WINDS ARE SPREADING ACROSS NORTHERN
   ILLINOIS AND SOUTHERN WISCONSIN. EXPECT 60-75-MPH WINDS TO REACH
   CHICAGO TO MILWAUKEE DURING THE 545 PM CDT TO 700 PM CDT TIME FRAME.
   BRIEF TORNADOES MAY ALSO OCCUR.

   DISCUSSION...THE ONGOING MATURE...DERECHO-PRODUCING MCS IS
   EXHIBITING AROUND 50-55 KT OF FORWARD MOTION AND HAS LIKELY REACHED
   PEAK INTENSITY. WIDESPREAD DAMAGING WINDS HAVE BEEN REPORTED...WITH
   A RECENT WIND GUST TO 78 MPH MEASURED IN SWRN WI. THE FAST SYSTEM
   MOTION WILL ENHANCE INFLOW AMIDST AN EXTREMELY UNSTABLE AIR MASS TO
   SUPPORT MCS MAINTENANCE AND WIDESPREAD DAMAGING WINDS ACROSS NRN IL
   AND SRN WI INTO EARLY EVENING. LINEAR EXTRAPOLATION OF THE ONGOING
   ACTIVITY TAKES THE SVR-WIND THREAT ACROSS THE CHICAGO AREA AND
   MILWAUKEE...PRIMARILY BETWEEN 545 PM CDT AND 700 PM CDT. A FEW BRIEF
   TORNADOES WILL ALSO BE POSSIBLE...PARTICULARLY WITH BOOKEND VORTICES
   IN SRN WI AND ALONG FLANKS OF PROMINENT REAR-INFLOW JETS.

   ..COHEN.. 06/30/2014


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

   LAT...LON   42258993 43069013 43508903 43148780 41678746 41408811
               41488984 42258993 

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Page last modified: June 30, 2014
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