

000 

WWUS20 KWNS 080411

SEL3

SPC WW 080411

IAZ000-NEZ000-SDZ000-081100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 483

NWS STORM PREDICTION CENTER NORMAN OK

1110 PM CDT SAT JUN 7 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF WESTERN IOWA

       MUCH OF CENTRAL AND EASTERN NEBRASKA

       SMALL PART OF SOUTHEASTERN SOUTH DAKOTA



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 1110 PM

UNTIL 600 AM 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 65

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES SOUTHWEST

OF BROKEN BOW NEBRASKA TO 25 MILES EAST NORTHEAST OF DENISON

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

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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

TORNADO WATCH NUMBER 480. WATCH NUMBER 480 WILL NOT BE IN EFFECT

AFTER 1110 PM CDT. CONTINUE...WW 482...



DISCUSSION...THUNDERSTORMS HAVE INCREASED IN NUMBER ACROSS MUCH OF

WATCH AREA WITH THE PRIMARY THREAT HAVING EVOLVED INTO A LARGE HAIL

AND WIND DAMAGE THREAT.  STRONG LOW LEVEL JET OF 50KT COUPLED WITH

THE VERY MOIST AND UNSTABLE AIR MASS WILL MAINTAIN CONDITIONS FOR

PRIMARILY ELEVATED SUPERCELLS AND POSSIBLE MCS DEVELOPMENT THROUGH

THE NIGHT.



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 24030.





...HALES

