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Mesoscale Discussion 1640
MD 1640 graphic
   
   MESOSCALE DISCUSSION 1640
   NWS STORM PREDICTION CENTER NORMAN OK
   1046 PM CDT SAT JUL 05 2003
   
   AREAS AFFECTED...SRN IA...NRN MO...CNTRL IL
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 649...651...
   
   VALID 060346Z - 060445Z
   
   CNTRL/ERN PORTIONS OF WW:  ELEVATED TSTMS HAVE REDEVELOPED ACROSS
   PORTIONS OF CNTRL/ERN IL ALONG/NORTH OF OUTFLOW BOUNDARY.  AIR
   PARCELS ARE ORIGINATING ACROSS THE MID MS VLY WHERE AIR MASS REMAINS
   UNSTABLE.  INCREASING ISENTROPIC LIFT ON SWLY LLJ WILL CONTINUE TO
   FAVOR BACKBUILDING TSTMS INTO CNTRL/ERN IL WITH A MARGINALLY SEVERE
   HAIL AND HEAVY RAINFALL THREAT.  OTHERWISE...LINE SEGMENT HAS
   EVOLVED FROM TSTM MERGER OVER NERN TIP OF MO.  THIS WILL BE MOVING
   ESEWD INTO A LARGELY UNTOUCHED AIR MASS AND MAY GIVE A DAMAGING WIND
   THREAT ACROSS WCNTRL IL THE NEXT COUPLE OF HOURS.  
   
   WRN PORTIONS OF WW: LARGE MCS CONTINUES TO EVOLVE OVER CNTRL/ERN NEB
   AND COLD POOL IS BECOMING STRONGER.  MCS MOTION VECTORS SUGGEST THAT
   THIS COMPLEX WILL MOVE INTO THE MID MO VLY AND INTO WRN PORTIONS OF
   THE WW ACROSS SWRN IA AND NWRN MO IN A FEW HOURS.  THUS...A DAMAGING
   WIND AND HAIL THREAT WILL INCREASE ONCE AGAIN.
   
   ANOTHER WW WILL LIKELY BE REQUIRED BY MIDNIGHT FOR PARTS OF ERN
   NEB...SRN IA/NRN MO AND PERHAPS AS FAR EAST AS IL.
   
   ..RACY.. 07/06/2003
   
   
   ATTN...WFO...LOT...ILX...LSX...DVN...DMX...EAX...OAX...
   
   42039535 41038775 39098777 40039536 
   
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