MESOSCALE DISCUSSION 0255
   NWS STORM PREDICTION CENTER NORMAN OK
   1117 AM CST SUN MAR 12 2006
   
   AREAS AFFECTED...NORTHERN MO/CENTRAL IL
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 72...
   
   VALID 121717Z - 121845Z
   
   SEVERE THUNDERSTORM WATCH 72 CONTINUES UNTIL 21Z FOR NORTHERN MO
   INTO WEST CENTRAL IL. AN ADDITIONAL WATCH EASTWARD INTO CENTRAL IL
   MAY BE NEEDED SOON.
   
   ONGOING SEVERE THREAT PERSISTS ACROSS WW 72...WITH EASTERN EXTENT
   HIGHLIGHTED BY SUPERCELL WITH TORNADIC HISTORY ONGOING ACROSS
   MONROE/SHELBY COUNTIES OF NORTHEAST MO AS OF 1715Z. THIS ACTIVITY
   APPEARS TO BE FOCUSED ALONG SECONDARY/NORTHERN WEAK BAROCLINIC ZONE
   DRAPED ACROSS NORTHEAST MO INTO CENTRAL IL. ALTHOUGH THERMODYNAMIC
   PROFILES WOULD INITIALLY APPEAR HOSTILE TO SURFACE BASED
   CONVECTION...ORGANIZATION OF ONGOING STORM/S AND MODEST DOWNSTREAM
   HEATING/INFLUX OF PROGRESSIVELY MORE UNSTABLE AIRMASS MAY REQUIRE AN
   ADDITIONAL WATCH ISSUANCE SOON INTO CENTRAL IL.
   
   ..GUYER.. 03/12/2006
   
   
   ATTN...WFO...LOT...ILX...LSX...DVN...EAX...
   
   40429338 40779012 40768822 39738789 39048808 38839071
   38899240 38979297 39409332