MESOSCALE DISCUSSION 1379
   NWS STORM PREDICTION CENTER NORMAN OK
   0525 PM CDT SAT JUL 23 2016

   AREAS AFFECTED...ERN IA...EXTREME SRN WI AND NRN IL

   CONCERNING...SEVERE THUNDERSTORM WATCH 412...

   VALID 232225Z - 240030Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 412
   CONTINUES.

   SUMMARY...THE THREAT FOR MAINLY DAMAGING WIND WILL PERSIST FROM
   EXTREME ERN IA INTO NRN IL AND EXTREME SRN WI THROUGH MID
   EVENING...THOUGH A BRIEF TORNADO CANNOT BE RULED OUT.

   DISCUSSION...THUNDERSTORMS WILL LIKELY CONTINUE DEVELOPING MAINLY
   ALONG AND NORTH OF A QUASI-STATIONARY FRONT THAT EXTENDS ACROSS NRN
   IL THROUGH ERN IA. FORCING FOR ASCENT ALONG AND NORTH OF THE FRONT
   FOSTERED BY AN MCV AND ATTENDANT LLJ WILL CONTINUE TO PROVIDE A
   FAVORABLE ENVIRONMENT FOR SUSTAINED STORMS NEXT FEW HOURS. LATEST
   OBJECTIVE ANALYSIS SHOWS A RESERVOIR OF STRONG INSTABILITY SOUTH OF
   THIS BOUNDARY...AND VWP FROM DAVENPORT INDICATES 150 M2/S2 0-1 KM
   STORM RELATIVE HELICITY AS WELL AS 40 KT 0-6 KM SHEAR. THE MOST
   ORGANIZED STORM WITH BOWING SEGMENTS AND EMBEDDED MESOCYCLONES
   CAPABLE OF DAMAGING WIND AND A BRIEF TORNADO IS APPROACHING THE
   IA/NWRN IL BORDER...MOVING INTO EXTREME NWRN IL.

   ..DIAL.. 07/23/2016


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

   LAT...LON   41639100 42859042 43028902 42878773 41638778 41498970
               41639100