URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 437
NWS STORM PREDICTION CENTER NORMAN OK
350 PM CDT FRI JUN 29 2012
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
EAST CENTRAL AND SOUTHEAST IOWA
NORTHWEST ILLINOIS
EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 350 PM UNTIL 900
PM 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 45
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES NORTHWEST
OF OTTUMWA IOWA TO 45 MILES NORTHEAST OF BURLINGTON IOWA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU7).
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...CONTINUE...WW 435...WW 436...
DISCUSSION...A CLUSTER OF STORMS NEAR DSM IS EXPECTED TO SLOWLY
INTENSIFY THIS AFTERNOON IN ADVANCE OF A REMNANT MCV. STRONG
INSTABILITY IS PRESENT IN ADVANCE OF THE STORMS WHERE SURFACE
HEATING IN CLOUD BREAKS WILL ALLOW ADDITIONAL DESTABILIZATION THIS
AFTERNOON. MEANWHILE...THE CONVECTION WILL HAVE A CORRIDOR TO
SPREAD EWD/ESEWD ALONG AND IMMEDIATELY N OF AN OUTFLOW BOUNDARY
ACROSS WRN IL AND SE IA. A FEW DAMAGING GUSTS AND LARGE HAIL WILL
BE POSSIBLE WITH THIS CONVECTION FOR THE NEXT FEW HOURS.
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.
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