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Mesoscale Discussion 747
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   MESOSCALE DISCUSSION 0747
   NWS STORM PREDICTION CENTER NORMAN OK
   0641 PM CDT SUN MAY 24 2015

   AREAS AFFECTED...NORTHERN IL/FAR EASTERN IA

   CONCERNING...TORNADO WATCH 207...

   VALID 242341Z - 250115Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 207 CONTINUES.

   SUMMARY...ISOLATED TORNADO POTENTIAL CONTINUES ESPECIALLY ACROSS
   NORTHERN IL/FAR EASTERN IA THROUGH MID-EVENING...WITH SOME SEVERE
   HAIL/LOCALLY DAMAGING WINDS ALSO A POSSIBILITY. TORNADO WATCH 207
   CONTINUES UNTIL 06Z.

   DISCUSSION...A WARM FRONT IS DRAPED ROUGHLY WEST-EAST FROM EASTERN
   IA ACROSS NORTHERN IL EARLY THIS EVENING...EXTENDING IN AREAS ALONG
   I-88/JUST SOUTH OF ROCKFORD EAST-SOUTHEASTWARD TOWARD THE WEST/SOUTH
   CHICAGO METRO AREA. WHILE DEEP-LAYER/LOW-LEVEL SHEAR IS ADEQUATE FOR
   A TORNADO RISK WITHIN THE WARM SECTOR ACROSS CENTRAL IL...A SOMEWHAT
   WARMER/MORE MIXED BOUNDARY LAYER EXISTS. THE MAIN POTENTIAL FOR
   SUPERCELL-RELATED TORNADOES LIKELY EXISTS FARTHER NORTH ACROSS
   NORTHERN IL WITH STORMS DEVELOPING NEAR/CROSSING THE AFOREMENTIONED
   NORTHWARD-DRIFTING WARM FRONT. REGIONAL WSR-88D VWP DATA FROM QUAD
   CITIES/CHICAGO SUGGESTS 0-1 KM SRH MAY BE AS HIGH AS 200-300
   M2/S2...WHICH WOULD SUPPORT A TORNADO RISK PARTICULARLY THROUGH
   MID-EVENING WITHIN A RELATIVELY MOIST/LOW LCL ENVIRONMENT WHERE
   SURFACE DEWPOINTS ARE GENERALLY IN THE MIDDLE 60S F.

   ..GUYER.. 05/24/2015


   ATTN...WFO...LOT...ILX...LSX...DVN...

   LAT...LON   40449155 41489157 42319097 42178930 41458812 39578995
               40449155 

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