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WWUS20 KWNS 230152

SEL3

SPC WW 230152

NEZ000-SDZ000-230700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 203

NWS STORM PREDICTION CENTER NORMAN OK

855 PM CDT SAT MAY 22 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTH CENTRAL NEBRASKA

       EAST CENTRAL SOUTH DAKOTA



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 855 PM

UNTIL 200 AM CDT.



TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES WEST SOUTHWEST OF

ONEILL NEBRASKA TO 10 MILES NORTH OF HURON SOUTH DAKOTA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU3).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 202...



DISCUSSION...THUNDERSTORMS ARE DEVELOPING SOUTHWARD INTO FAR

NORTHERN NEB ALONG THE SURFACE DRYLINE/COLD FRONT.  THESE STORMS ARE

EXPECTED TO SPREAD EAST-NORTHEASTWARD ACROSS THE WATCH AREA THIS

EVENING.  LARGE HAIL AND DAMAGING WINDS ARE THE MAIN THREATS.

HOWEVER...A VERY UNSTABLE ENVIRONMENT COUPLED WITH A STRENGTHENING

LOW LEVEL JET WILL POSE A RISK OF ISOLATED TORNADOES.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 24030.





...HART

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