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000 

WWUS20 KWNS 030934

SEL2

SPC WW 030934

IAZ000-MOZ000-NEZ000-031700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 432

NWS STORM PREDICTION CENTER NORMAN OK

430 AM CDT TUE JUN 3 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN AND CENTRAL IOWA

       NORTHERN MISSOURI

       SOUTHEASTERN NEBRASKA



EFFECTIVE THIS TUESDAY MORNING FROM 430 AM UNTIL NOON 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 85

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES SOUTH

SOUTHEAST OF SHENANDOAH IOWA TO 45 MILES EAST NORTHEAST OF FORT

DODGE IOWA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 427...SEVERE THUNDERSTORM WATCH

NUMBER 428. WATCH NUMBER 427 428 WILL NOT BE IN EFFECT AFTER 430

AM CDT. CONTINUE...WW 429...WW 430...WW 431...



DISCUSSION...STRONG TO SVR TSTMS EXPECTED TO PERSIST ALONG AND AHEAD

OF LOBE OF ASCENT EXTENDING SSW FROM NW IA MCV.  THE TSTMS LIKELY

ARE ELEVATED...ROOTED IN A MOIST LAYER NEAR 800 OR 750 MB...ABOVE

THE STOUT EML.  SUFFICIENT ELEVATED CAPE APPEARS PRESENT TO SUPPORT

SVR HAIL...WITH DMGG WIND ALSO POSSIBLE.  IN ADDITION...STORMS IN SW

AND S CNTRL IA WILL HAVE TO BE MONITORED FOR SIGNS THAT THEY ARE

BEGINNING TO TAP BOUNDARY LAYER AIR.  MOIST ESELY SFC FLOW IN THIS

REGION COULD SUPPORT ENHANCED LOW-LEVEL ROTATION/POSSIBLE TORNADOES

IF THAT SCENARIO WERE TO OCCUR.



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 500. MEAN STORM

MOTION VECTOR 26030.





...CORFIDI

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