MESOSCALE DISCUSSION 0588
   NWS STORM PREDICTION CENTER NORMAN OK
   0614 PM CDT SUN APR 26 2009
   
   AREAS AFFECTED...NERN KS...NWRN/NRN MO...SRN/ERN IA...SWRN
   WI...EXTREME NWRN IL
   
   CONCERNING...TORNADO WATCH 194...
   
   VALID 262314Z - 270015Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 194 CONTINUES.
   
   MULTI-MODAL SEVERE WEATHER THREAT IS EVOLVING ACROSS TORNADO WATCH
   194. AT 23Z...A BOW ECHO/LEWP WAS MOVING E TOWARD CNTRL/SRN
   IA...TRAILING SWD INTO NWRN MO AND ERN KS. COLD POOL BEHIND THE
   LINEAR MCS IS ASSOCIATED WITH A 1008 MB MESO HIGH LOCATED INVOF OF
   FNB. AHEAD OF THE LINE FROM CNTRL INTO NERN/ERN IA...STORMS ARE
   SLIGHTLY MORE DISCRETE. ONE STORM MOVING FROM LINN COUNTY IA INTO
   DUBUQUE COUNTY HAS PRODUCED SEVERAL TORNADOES NEAR A NWD RETREATING
   WARM FRONT. THAT ENVIRONMENT IS CHARACTERIZED BY RAPID
   DESTABILIZATION AND FAVORABLE VERTICAL WIND SHEAR FOR SUPERCELLS
   CAPABLE OF PRODUCING LARGE HAIL/DAMAGING WINDS AND POSSIBLE
   TORNADOES /ESPECIALLY NEAR THE THERMAL BOUNDARY/. SHORT TERM MODEL
   GUIDANCE INDICATES THE WARM FRONT WILL CONTINUE TO LIFT THROUGH NRN
   IL AND SRN WI DURING THE EVENING...ACCOMPANIED BY A POSSIBLE
   INCREASE IN SVR WEATHER THREAT. FARTHER W-SW OVER SRN IA INTO NRN MO
   AND ERN KS...THE TREND TOWARD LINEAR MCS/STRENGTHENING COLD POOL
   SUGGESTS AN INCREASING THREAT FOR DAMAGING WINDS HAS DEVELOPED.
   HOWEVER...LOW LVL VERTICAL WIND SHEAR REMAINS STRONG...AND TORNADO
   THREAT MAY EXIST WITH EMBEDDED MESO VORTICES WITHIN LEADING EDGE OF
   BOWING STRUCTURES...AS WELL AS WITH STORMS FORMING AHEAD OF THE
   LINE.
   
   ..GARNER.. 04/26/2009
   
   
   ATTN...WFO...MKX...DVN...ARX...SGF...DMX...EAX...OAX...TOP...
   ICT...
   
   LAT...LON   38059746 43229275 43178957 38059459 38059746