SWOMCD
SPC MCD 301944
INZ000-ILZ000-302115-
MESOSCALE DISCUSSION 0899
NWS STORM PREDICTION CENTER NORMAN OK
0244 PM CDT SAT MAY 30 2009
AREAS AFFECTED...IL
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 301944Z - 302115Z
BECOMING INCREASINGLY CONCERNED ABOUT CU FIELD EXPANSION ALONG
ADVANCING COLD FRONT AS IT PROGRESSES SEWD INTO IL. ALTHOUGH FLOW
HAS VEERED CONSIDERABLY IN THE WAKE OF EARLIER SHORTWAVE TROUGH...IT
APPEARS SUFFICIENT LOW LEVEL CONVERGENCE WILL BE AVAILABLE...GIVEN
VERY STEEP LAPSE RATE ENVIRONMENT...FOR THUNDERSTORM INITIATION
WITHIN THE NEXT FEW HOURS. LATEST DIAGNOSTIC DATA ALSO SUGGESTS PW
VALUES ARE HOLDING ABOVE ONE INCH ACROSS THE SRN HALF OF IL WHICH
DESPITE VEERING/DRYING BOUNDARY LAYER SHOULD SUPPORT ROBUST
CONVECTIVE DEVELOPMENT CAPABLE OF GENERATING LARGE HAIL/DAMAGING
WINDS. WW MAY BE REQUIRED ALONG NW-SE ORIENTED FASHION TO ACCOUNT
FOR THIS INCREASED SEVERE RISK.
..DARROW.. 05/30/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...IND...LOT...ILX...LSX...DVN...
LAT...LON 41018991 40078744 38718867 40229087 41018991
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