MESOSCALE DISCUSSION 0874
   NWS STORM PREDICTION CENTER NORMAN OK
   0742 PM CDT WED MAY 23 2007
   
   AREAS AFFECTED...WRN WI...NRN/CENTRAL IA...SERN MN
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 291...292...
   
   VALID 240042Z - 240245Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
   291...292...CONTINUES.
   
   THREAT FOR SVR TSTMS MAY CONTINUE FOR ANOTHER COUPLE OF HOURS BEYOND
   WW 291/292 EXPIRATION TIMES /02Z/. A NEW WW ISSUANCE IS NOT
   ANTICIPATED...BUT LOCAL WFO EXTENSION IN AREA AND TIME FOR BOTH WW/S
   ARE POSSIBLE.
   
   EARLIER CONVECTIVE LINE OVER NRN PORTIONS OF WW 291 /NWRN WI/ HAS
   WEAKENED...AND SVR THREAT APPEARS LIMITED IN THIS AREA. FURTHER
   SOUTH...ADDITIONAL ISOLATED CONVECTIVE CELLS AND CONVECTIVE LINE
   WILL CONTINUE TO PROGRESS ENEWD AROUND 20 KTS ACROSS CENTRAL IA INTO
   SERN MN...SWRN/WCENTRAL WI. GIVEN A MODERATE LOW LEVEL JET THAT IS
   FORECAST TO STRENGTHEN IN THE NEXT FEW HOURS...ALONG WITH MODERATE
   INSTABILITY /MUCAPES AROUND 2000 J/KG/...SVR THREAT IS EXPECTED TO
   CONTINUE FOR A FEW MORE HOURS...POSSIBLY FOR 1-2 HOURS BEYOND 02Z.
   GIVEN LIMITED AREA/TIME FOR SVR THREAT BEYOND 02Z...A NEW WW
   ISSUANCE IS NOT ANTICIPATED. HOWEVER...LOCAL WFO/S MAY EXTEND BOTH
   WW/S 291/292 UP TO 2 HOURS AFTER THE CURRENT 02Z EXPIRATION TIME.
   
   ..CROSBIE.. 05/24/2007
   
   
   ATTN...WFO...GRB...DVN...ARX...MPX...DMX...
   
   44919034 45029137 44159253 43879347 42799351 42199355
   41479404 41299472 40699478 40579421 40639219 41189218
   41399213 41939214 42239203 42349207 43139199 43499106
   44699007