MESOSCALE DISCUSSION 0949
   NWS STORM PREDICTION CENTER NORMAN OK
   0621 PM CDT MON MAY 19 2008
   
   AREAS AFFECTED...NWRN/CNTRL IA
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 192321Z - 200015Z
   
   FAST-MOVING SHOWERS/ISOLATED EMBEDDED TSTMS WILL CONTINUE TO POSE A
   THREAT FOR SEVERE WIND GUSTS OVER THE NEXT FEW HOURS PRIOR TO ONSET
   OF NOCTURNAL COOLING AND LESS FAVORABLE AIR MASS FARTHER DOWNSTREAM.
   GIVEN THE SHORT-DURATION AND ISOLATED NATURE OF THIS CONVECTION...A
   WW DOES NOT APPEAR PRUDENT.
   
   RADAR/SATELLITE IMAGERY DEPICTED AN AREA OF LOW-TOPPED CONVECTION
   MOVING RAPIDLY SEWD IN NWRN IA/FAR SWRN MN WITH A FEW SEVERE WIND
   GUSTS RECENTLY RECORDED BY AWOS/RWIS SITES. THIS APPEARS TO HAVE
   DEVELOPED IN RESPONSE TO FORCED ASCENT FROM A SHORT WAVE TROUGH
   DIVING THROUGH THE UPPER MS RIVER VALLEY...AND ITS ASSOCIATED
   SURFACE LOW ANALYZED NEAR FOD. THE THERMODYNAMIC/KINEMATIC
   ENVIRONMENT WILL REMAIN FAVORABLE FOR CONTINUED LOCALIZED STRONG TO
   SEVERE WINDS OVER THE NEXT HOUR OR SO...OWING TO STEEP LAPSE RATES
   AND STRONG NWLY WINDS PUSHING SEWD IN ASSOCIATION WITH SHORT WAVE
   TROUGH. THE SEVERE THREAT SHOULD DIMINISH RATHER QUICKLY AS
   TEMPERATURE/DEW POINT SPREADS ARE NOT AS LARGE FARTHER DOWNSTREAM
   AND AS NOCTURNAL COOLING COMMENCES.
   
   ..GRAMS.. 05/19/2008
   
   
   ATTN...WFO...DVN...MPX...DMX...EAX...FSD...OAX...
   
   42369251 41509215 40629237 40509337 41119448 42069568
   42809601 43339590 43749536 43559437 43059330