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Mesoscale Discussion 240
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   MESOSCALE DISCUSSION 0240
   NWS STORM PREDICTION CENTER NORMAN OK
   1248 PM CST THU MAR 01 2007
   
   AREAS AFFECTED...EAST CENTRAL/SOUTHERN IL INTO WEST
   CENTRAL/SOUTHWEST INDIANA
   
   CONCERNING...TORNADO WATCH 45...
   
   VALID 011848Z - 012045Z
   
   SEVERE THREAT CONTINUES ACROSS TORNADO WATCH 45...WITH POTENTIAL FOR
   ISOLATED TORNADOES AND LARGE HAIL/DAMAGING WIND GUSTS SPREADING
   EASTWARD ACROSS EASTERN IL INTO WESTERN INDIANA OVER THE NEXT
   SEVERAL HOURS.
   
   IN WAKE OF EARLY DAY/DECAYING CONVECTION CURRENTLY CROSSING THE
   WABASH RIVER AT 1845Z...STRONG/SEVERE STORMS CONTINUE TO STEADILY
   MATURE AND DEVELOP SOUTHWARD IN AN ARC EXTENDING ACROSS
   CENTRAL/SOUTHERN IL...ROUGHLY FROM A PEORIA-TAYLORVILLE-SALEM
   CORRIDOR...SOUTHWARD TOWARD THE CAPE GIRARDEAU MO AREA. THIS
   ACTIVITY IS COINCIDENT WITH THE LOW LEVEL FRONTAL OCCLUSION
   EXTENDING FROM THE STACKED CYCLONE OVER SOUTHERN IA. WITH THE
   OVERSPREADING MID LEVEL DRY SLOT PER WATER VAPOR IMAGERY...AND
   NARROW CORRIDOR OF PRE-CONVECTION CLEARING/GRADUAL LOW LEVEL MOIST
   INFLUX...ADDITIONAL DESTABILIZATION APPEARS LIKELY ALONG/AHEAD OF
   THE CONVECTIVE LINE. AS SUCH...THE SEVERE THREAT APPEARS LIKELY TO
   INCREASE OVER THE NEXT SEVERAL HOURS ACROSS MUCH OF EASTERN IL INTO
   WESTERN INDIANA. IN ADDITION TO LARGE HAIL/DAMAGING WIND GUSTS WITH
   THE MOST VIGOROUS STORMS...THE POSSIBILITY FOR ISOLATED TORNADOES
   PRIMARILY EXISTS WITH NEAR SURFACE BASED STORMS /MOST LIKELY WITH
   SOUTH EXTENT/ DEVELOPING ALONG THE ARCING FRONTAL OCCLUSION. WITHIN
   THIS CORRIDOR...BACKED SOUTHEASTERLY WINDS/HIGH HELICITY ENVIRONMENT
   IN THE LOW LEVELS...COUPLED WITH LOWER/MIDDLE 50S DEWPOINTS AND
   CONCENTRATED LOW LEVEL BUOYANCY...WILL REMAIN FAVORABLE FOR LOW
   LEVEL MESOCYCLONES AND THE POSSIBILITY OF ISOLATED TORNADOES.
   
   ..GUYER.. 03/01/2007
   
   
   ATTN...WFO...LMK...IND...PAH...ILX...LSX...
   
   40198924 40358853 40408720 40238631 39918604 38848618
   37528654 37198727 37108849 37308909 38298926 39118930 
   
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