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000 

WWUS20 KWNS 091832

SEL7

SPC WW 091832

NEZ000-SDZ000-WYZ000-100300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 287

NWS STORM PREDICTION CENTER NORMAN OK

1230 PM MDT FRI MAY 9 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NEBRASKA PANHANDLE

       EXTREME SOUTHWEST SOUTH DAKOTA

       EASTERN WYOMING



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 1230 PM UNTIL

900 PM MDT.



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 110 MILES NORTH OF

DOUGLAS WYOMING TO 10 MILES SOUTHWEST OF SIDNEY NEBRASKA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU7).



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.



DISCUSSION...STRONG SHRTWV TROUGH DVLPG EAST ACRS ROCKIES ATTM WILL

AID STORM INITIATION AND MAINTENENCE ACROSS AREA THROUGH LATE TODAY.

LIMITED MOISTURE AND WEAK CONVECTIVE INSTABILITY WILL BE SOMEWHAT

COUNTERED BY STEEPENING MID LEVEL LAPSE RATES...FORCING...AND SHEAR

AS THE MID LEVEL DISTURBANCE SPREADS EAST. GENERALLY HIGH-BASED

ORGANIZED STORMS/SUPERCELLS ARE ANTICIPATED WITH ATTENDANT THREATS

OF POTENTIALLY DAMAGING HAIL AND HIGH WINDS.



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 350. MEAN STORM

MOTION VECTOR 28025.





...CARBIN

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