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Mesoscale Discussion 309
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   MESOSCALE DISCUSSION 0309
   NWS STORM PREDICTION CENTER NORMAN OK
   0931 PM CDT WED MAR 21 2007
   
   AREAS AFFECTED...IA...SWWD INTO NERN KS
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 64...
   
   VALID 220231Z - 220330Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 64
   CONTINUES.
   
   SEVERE THUNDERSTORM WATCH MAY BE REQUIRED DOWNSTREAM ACROSS PORTIONS
   OF IA INTO NRN MO.
   
   STRONGEST STORMS CONTINUE ALONG COLD FRONT SWEEPING ACROSS SERN
   PORTIONS OF WW.  THIS ACTIVITY WILL LIKELY MAINTAIN ITS INTENSITY AS
   IT PROGRESSES ACROSS SCNTRL IA...SWWD INTO NERN KS WHERE AN AXIS OF
   MODERATE INSTABILITY HAS YET TO BE OVERTURNED.  ADDITIONALLY...LLJ
   IS EXPECTED TO INCREASE IN EXCESS OF 60KT INTO THIS ACTIVITY BEFORE
   SHIFTING DOWNSTREAM INTO CNTRL IL TOWARD SUNRISE.  LARGE HAIL AND
   DAMAGING WINDS ARE POSSIBLE WITH THESE STORMS.
   
   FARTHER NORTH...SCATTERED STRONG/ISOLATED SEVERE STORMS WILL SPREAD
   ACROSS THE REMAINDER OF NRN IA INTO SWRN PORTIONS OF WI. 
   SHEAR/INSTABILITY REMAIN STRONG ENOUGH ACROSS THIS REGION TO
   MAINTAIN ROBUST UPDRAFTS CAPABLE OF PRODUCING MARGINALLY SEVERE
   HAIL.
   
   ..DARROW.. 03/22/2007
   
   
   ATTN...WFO...ARX...DMX...EAX...OAX...TOP...
   
   39799679 41199489 42689460 43379338 43029241 42539272
   41819360 40879335 39769439 
   
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