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181 

WWUS20 KWNS 220355

SEL1

SPC WW 220355

NEZ000-SDZ000-WYZ000-220800-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 201

NWS STORM PREDICTION CENTER NORMAN OK

1000 PM MDT FRI MAY 21 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NEBRASKA PANHANDLE

       SOUTHWEST SOUTH DAKOTA

       SOUTHEAST WYOMING



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1000 PM

UNTIL 200 AM MDT.



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 45

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

OF TORRINGTON WYOMING TO 35 MILES NORTHEAST OF CHADRON NEBRASKA.

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...CONTINUE...WW 200...



DISCUSSION...ISOLATED INTENSE THUNDERSTORMS WILL CONTINUE TO AFFECT

PORTIONS OF EASTERN WY...SOUTHWEST SD...AND NORTHERN PORTIONS OF THE

NEB PANHANDLE TONIGHT.  ACTIVITY IS PRIMARILY ALONG AND NORTH OF THE

SURFACE BOUNDARY...WHERE FAVORABLE SHEAR AND ELEVATED CAPE WILL

SUPPORT SUPERCELLS CAPABLE OF LARGE HAIL.



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 450. MEAN STORM

MOTION VECTOR 26030.





...HART

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