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434 

WWUS20 KWNS 102046

SEL0

SPC WW 102046

IAZ000-KSZ000-MOZ000-NEZ000-110400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 370

NWS STORM PREDICTION CENTER NORMAN OK

345 PM CDT SUN JUN 10 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN AND CENTRAL IOWA

       NORTHEAST KANSAS

       NORTHWEST MISSOURI

       EASTERN NEBRASKA



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 345 PM UNTIL

1100 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 70

STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTHEAST OF

SPENCER IOWA TO 40 MILES SOUTHWEST OF TOPEKA KANSAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU0).



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 368...WW 369...



DISCUSSION...TSTM DEVELOPMENT IS ANTICIPATED WITHIN THE NEXT HOUR

INVOF OF COLD FRONT MOVING EWD/SEWD ACROSS THE WATCH AREA.  LATEST

OBJECTIVE DATA INDICATE THAT PRE-FRONTAL AIR MASS HAS BECOME

MODERATE-STRONGLY UNSTABLE WITH MLCAPE RANGING FROM 1000-1500 J/KG

ACROSS NWRN IA TO 3000-3500 J/KG OVER NERN KS.  WHILE STRONGER MID

AND HIGH-LEVEL WIND FIELD LAGS WARM SECTOR TO THE W...A NARROW BAND

OF 30-40 KT SWLY DEEP-LAYER SHEAR COINCIDES WITH THE FRONT.  AS

SUCH...SETUP WILL BE SUPPORTIVE OF LINE SEGMENTS AND SUPERCELL STORM

MODES WITH AN ASSOCIATED THREAT FOR LARGE HAIL AND DAMAGING WIND

GUSTS.



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 500. MEAN STORM

MOTION VECTOR 23025.





...MEAD

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