

000 

WWUS20 KWNS 120017

SEL1

SPC WW 120017

COZ000-KSZ000-NEZ000-WYZ000-120600-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 511

NWS STORM PREDICTION CENTER NORMAN OK

615 PM MDT WED JUL 11 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHEAST COLORADO

       NORTHWEST KANSAS

       SOUTHWEST NEBRASKA

       SOUTHEAST WYOMING



EFFECTIVE THIS WEDNESDAY NIGHT FROM 615 PM UNTIL MIDNIGHT MDT.



TORNADOES...HAIL TO 2 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 65 STATUTE

MILES EAST AND WEST OF A LINE FROM 30 MILES WEST NORTHWEST OF

TORRINGTON WYOMING TO 40 MILES SOUTH OF BURLINGTON COLORADO.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 509...WW 510...



DISCUSSION...TSTMS/POSSIBLE SUPERCELLS EXPECTED TO INCREASE OVER WW

AREA THIS EVENING AS MOIST SELY UPSLOPE FLOW PERSISTS BENEATH 30-40

KT NWLY MID LVL FLOW.  LOW LEVEL DIRECTIONAL SHEAR AND MODEST T/TD

SPREADS SUGGEST A THREAT FOR TORNADOES IN ADDITION TO LARGE

HAIL/WIND. GRADUAL INCREASE IN LOW LVL MOISTURE AND NOCTURNAL

STRENGTHENING OF SSWLY LLJ SUGGEST POSSIBLE UPSCALE GROWTH INTO AN

MCS WITH A CONTINUED THREAT FOR HAIL/WIND ESE INTO KS.



AVIATION...TORNADOES AND 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 32025.





...CORFIDI

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