

403 

WWUS20 KWNS 240437

SEL9

SPC WW 240437

NEZ000-SDZ000-WYZ000-241100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 209

NWS STORM PREDICTION CENTER NORMAN OK

1140 PM CDT SUN MAY 23 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN NEBRASKA PANHANDLE

       SOUTHERN SOUTH DAKOTA

       EASTERN WYOMING



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 1140 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 70

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 80 MILES WEST

NORTHWEST OF CHADRON NEBRASKA TO 20 MILES NORTH NORTHEAST OF

MITCHELL SOUTH DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 207...WW 208...



DISCUSSION...THUNDERSTORMS ARE INCREASING ACROSS CENTRAL/WESTERN NEB

AND LIFTING QUICKLY NORTHWARD INTO SD AND EASTERN WY.  A

STRENGTHENING LOW LEVEL JET WILL HELP TO TRANSPORT MOISTURE

NORTHWESTWARD AND AID IN THE DESTABILIZATION OVERNIGHT.  ELEVATED

SUPERCELLS CAPABLE OF LARGE HAIL ARE THE MAIN THREAT...ALTHOUGH

DAMAGING WINDS ARE ALSO POSSIBLE OVER THE WESTERN PARTS OF THE WATCH

AREA.



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 22035.





...HART

