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WWUS20 KWNS 041837

SEL2

SPC WW 041837

COZ000-NEZ000-WYZ000-050200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 442

NWS STORM PREDICTION CENTER NORMAN OK

140 PM CDT SUN JUL 4 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF NORTHEAST COLORADO

       PARTS OF NEBRASKA PANHANDLE

       PARTS OF SOUTHEAST WYOMING



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 140 PM UNTIL 900

PM 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 NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTH SOUTHWEST OF

RAWLINS WYOMING TO 20 MILES SOUTHEAST OF SIDNEY NEBRASKA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU2).



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.



DISCUSSION...VEERING SHEAR PROFILES...STEEP LAPSE RATES COUPLED WITH

SUFFICIENT MOISTURE/INSTABILITY FAVOR DEVELOPMENT OF SUPERCELLS OFF

THE HIGHER TERRAIN.  WITH AP ROACH OF MID LEVEL TROUGH FROM

UTAH...THUNDERSTORMS WILL DEVELOP EWD AND SEWD ACROSS SERN WY INTO

NERN CO THRU THE AFTERNOON.  LARGE HAIL AND ISOLATED TORNADOES WILL

BE ASSOCIATED WITH SUPERCELLS THAT DEVELOP.



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 27020.





...HALES

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