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WWUS20 KWNS 020037

SEL7

SPC WW 020037

COZ000-NEZ000-WYZ000-020700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 537

NWS STORM PREDICTION CENTER NORMAN OK

640 PM MDT WED JUL 1 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST COLORADO

       WESTERN NEBRASKA

       SOUTHEAST WYOMING



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 640 PM

UNTIL 100 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 85

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

NORTHEAST OF CHADRON NEBRASKA TO 35 MILES WEST SOUTHWEST OF AKRON

COLORADO.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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.



DISCUSSION...ISOLATED INTENSE THUNDERSTORMS HAVE DEVELOPED OVER

SOUTHEAST WY... THE NORTHERN NEB PANHANDLE...AND NORTHEAST CO.

THESE STORMS ARE EXPECTED TO SPREAD EASTWARD INTO MORE MOIST AND

UNSTABLE AIRMASS ACROSS THE WATCH AREA THROUGH THE EVENING.

SUFFICIENT VERTICAL SHEAR SUGGESTS A RISK OF LOCALLY DAMAGING WINDS

AND HAIL IN MORE PERSISTENT AND ORGANIZED STORMS.



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 28025.





...HART

