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WWUS20 KWNS 282052

SEL5

SPC WW 282052

COZ000-KSZ000-NEZ000-290400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 235

NWS STORM PREDICTION CENTER NORMAN OK

255 PM MDT TUE MAY 28 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  NORTHEAST COLORADO

  NORTHWEST KANSAS

  WESTERN NEBRASKA INCLUDING THE PANHANDLE



* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 255 PM UNTIL

  1000 PM MDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO

    2.5 INCHES IN DIAMETER POSSIBLE

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES NORTHEAST OF

CHADRON NEBRASKA TO 55 MILES SOUTHEAST OF AKRON COLORADO.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU5).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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 233...WW 234...



DISCUSSION...TSTMS DEVELOPED ACROSS THE AREA ALONG THE LEADING EDGE

OF STRONGER HEIGHT FALLS SPREADING E OF THE GREAT BASIN.  AREA

VAD/PROFILER DATA INDICATE MIDLEVEL FLOW STRENGTHENING TO 30-35 KT

ATOP A LOW-LEVEL WIND FIELD THAT SHOULD CONTINUE TO INCREASE OUT OF

THE SE OWING TO LEE CYCLOGENESIS ACROSS ERN CO.  GIVEN THE STEEP

LAPSE RATES IN PLACE...THE SETUP WILL SUPPORT SUPERCELLS CAPABLE OF

LARGE HAIL AND LOCALLY DAMAGING WIND GUSTS.



AVIATION...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 26020.





...MEAD

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