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WWUS20 KWNS 032049

SEL1

SPC WW 032049

COZ000-NEZ000-040300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 541

NWS STORM PREDICTION CENTER NORMAN OK

250 PM MDT FRI JUL 3 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST COLORADO

       WESTERN NEBRASKA



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 250 PM UNTIL 900

PM MDT.



HAIL TO 1.5 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 65

STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH

NORTHWEST OF MULLEN NEBRASKA TO 30 MILES WEST OF AKRON COLORADO.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 540...



DISCUSSION...STORMS WILL CONTINUE TO INCREASE FROM SERN WY ACROSS

NERN CO AND INTO THE NEB PANHANDLE THROUGH THE EVENING HOURS. THIS

ACTIVITY WAS DEVELOPING WITHIN A MODESTLY UNSTABLE AIRMASS WHERE

EFFECTIVE DEEP-LAYER SHEAR AROUND 40KT WILL SUPPORT SUPERCELLS. LIFT

ACROSS THE REGION WILL BE ENHANCED/SUSTAINED BY SHORT WAVE TROUGH

DEVELOPING EAST FROM THE ROCKIES AND SHOULD CONTRIBUTE TO AN

INCREASING THREAT FOR LARGE HAIL AND HIGH WINDS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 28020.





...CARBIN

