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209 

WWUS20 KWNS 050904

SEL1

SPC WW 050904

IAZ000-MOZ000-NEZ000-051600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 261

NWS STORM PREDICTION CENTER NORMAN OK

400 AM CDT SAT JUN 5 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHERN IOWA

       NORTHERN MISSOURI

       EASTERN NEBRASKA



EFFECTIVE THIS SATURDAY MORNING FROM 400 AM UNTIL 1100 AM 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 65

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES WEST

SOUTHWEST OF TEKAMAH NEBRASKA TO 60 MILES EAST NORTHEAST OF

KIRKSVILLE MISSOURI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 258...SEVERE THUNDERSTORM WATCH

NUMBER 259. WATCH NUMBER 258 259 WILL NOT BE IN EFFECT AFTER 400

AM CDT. CONTINUE...WW 260...



DISCUSSION...ERN NEB MCS EXPECTED TO PERSIST AND POSSIBLY STRENGTHEN

AS IT MOVES/DEVELOPS MAINLY ESE INTO IA...WHERE UPLIFT/INFLOW WILL

BE PROVIDED BY WRN BRANCH OF SWLY LLJ.  SRN IA/NRN MO MCS SHOULD

ALSO CONTINUE ESE...ALTHOUGH WEAKER LOW LVL INFLOW OVER REGION

COMPARED TO ERN NEB/WRN IA PROVIDES REDUCED CONFIDENCE IN STRENGTH/

SUSTENANCE OF STORMS.  AMPLE CLOUD LAYER CAPE/SHEAR WILL BE PRESENT

THROUGHOUT WW FOR ISOLD SVR HAIL AND POSSIBLY DMGG WIND WITH ANY

SUSTAINED STORMS.



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 28030.





...CORFIDI

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