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MESOSCALE DISCUSSION 0841
NWS STORM PREDICTION CENTER NORMAN OK
0814 PM CDT FRI MAY 15 2009
AREAS AFFECTED...PARTS OF CENTRAL AND SRN IL...MUCH OF INDIANA...AND
W CENTRAL AND SWRN OH
CONCERNING...TORNADO WATCH 306...309...
VALID 160114Z - 160315Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 306...309...CONTINUES.
STRONG/SEVERE STORMS CONTINUE MOVING ACROSS WW 305 AND 309. AS
STORMS BEGIN MOVING INTO SERN IL -- OUT OF WW 305 -- A NEW WATCH MAY
BE REQUIRED FOR SERN IL/SRN INDIANA.
MODERATE INSTABILITY CONTINUES ACROSS MUCH OF INDIANA AND IL NEAR
AND S OF THE WARM FRONT...AND SOUTHEAST OF THE MAIN CONVECTIVE BAND
NOW EXTENDING FROM NWRN INDIANA SWWD TO NEAR STL. STORMS REMAIN
FAIRLY WELL-ORGANIZED...AIDED BY AMPLE DEEP-LAYER SHEAR ACROSS THIS
REGION. THOUGH FLOW WEAKENS WITH SWD EXTENT TOWARD THE OH
RIVER...ORGANIZED NATURE OF THE ONGOING STORMS NOW CROSSING IL
SUGGESTS THAT SOME SEVERE THREAT WILL SPREAD SEWD OUT OF WW 306 INTO
SERN IL -- AND EVENTUALLY INTO SRN INDIANA. NEW WW MAY BE NEEDED
BEFORE 16/02Z -- WHILE THREAT CONTINUES ACROSS EXISTING PORTIONS OF
WW 305 AND 309.
..GOSS.. 05/16/2009
ATTN...WFO...CLE...ILN...LMK...IWX...IND...PAH...LOT...ILX...
LSX...
LAT...LON 37978789 38649049 40878741 41238543 40728334 39288387
38158603 37978789
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