SEL5
SPC WW 082311
IAZ000-ILZ000-WIZ000-090500-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 275
NWS STORM PREDICTION CENTER NORMAN OK
615 PM CDT FRI MAY 8 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
EASTERN IOWA
NORTHWEST ILLINOIS
SOUTHWEST WISCONSIN
EFFECTIVE THIS FRIDAY NIGHT FROM 615 PM UNTIL MIDNIGHT CDT.
HAIL TO 1.5 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 75
STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH OF
DUBUQUE IOWA TO 40 MILES SOUTH SOUTHWEST OF MOLINE ILLINOIS. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU5).
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 268...WW 270...WW
271...WW 272...WW 273...WW 274...
DISCUSSION...TSTMS EXPECTED TO PERSIST THROUGH THE EVE IN AREA OF
STRONG LOW TO MID LVL ASCENT AHEAD OF STRONG VORT CROSSING NRN IA.
STRENGTH OF WIND FIELD...CONCENTRATED LOW LVL CONVERGENCE...AND COOL
MID LVL TEMPERATURES SUGGEST A CONTINUED THREAT FOR SVR
WIND/HAIL...DESPITE LIMITED MOISTURE INFLOW.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400. MEAN STORM
MOTION VECTOR 26045.
...CORFIDI/JEWELL
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