[LeArc] SVR TSTORM WATCH 439

[Brandon Sullivan]

URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 439
   NWS STORM PREDICTION CENTER NORMAN OK
   645 PM CDT THU JUN 21 2007

   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

          PARTS OF EASTERN IOWA
          PARTS OF NORTHWESTERN ILLINOIS
          SMALL PART OF NORTHEAST MISSOURI
          PARTS OF SOUTHWESTERN WISCONSIN

   EFFECTIVE THIS THURSDAY NIGHT FROM 645 PM UNTIL MIDNIGHT CDT.

   HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
   MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
   STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES NORTH
   NORTHEAST OF LONEROCK WISCONSIN TO 50 MILES SOUTHWEST OF
   BURLINGTON IOWA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).

   REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
   FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
   AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
   THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
   AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
   DO PRODUCE TORNADOES.

   OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES
   SEVERE THUNDERSTORM WATCH NUMBER 434...SEVERE THUNDERSTORM WATCH
   NUMBER 436. WATCH NUMBER 434 436 WILL NOT BE IN EFFECT AFTER 645
   PM CDT. CONTINUE...WW 435...WW 437...WW 438...

   DISCUSSION...ORGANIZED LINE OF SEVERE THUNDERSTORMS MOVING EWD
   ACROSS ERN IA WILL CONTINUE DAMAGING WIND THREAT FOR SEVERAL HOURS
   AS AIR MASS ACROSS WATCH IS MDTLY UNSTABLE.

   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
   MOTION VECTOR 27030.