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WWUS20 KWNS 100252

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SPC WW 100252

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 760

NWS STORM PREDICTION CENTER NORMAN OK

850 PM MDT TUE AUG 9 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST COLORADO

       NORTHWEST KANSAS

       SOUTHWEST NEBRASKA



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 850 PM

UNTIL 400 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 100

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH OF

SIDNEY NEBRASKA TO 80 MILES SOUTH SOUTHEAST OF GOODLAND KANSAS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



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...THIS SEVERE THUNDERSTORM WATCH REPLACES

TORNADO WATCH NUMBER 754. WATCH NUMBER 754 WILL NOT BE IN EFFECT

AFTER 850 PM MDT. CONTINUE...WW 757...WW 758...WW 759...



DISCUSSION...TSTMS...INCLUDING A FEW SUSTAINED STORMS AND POSSIBLY

SUPERCELLS...EXPECTED TO PERSIST/REDEVELOP THROUGH EARLY WED IN ZONE

OF LOW LVL UPSLOPE FLOW BENEATH SEASONABLY STRONG WNWLY MID LVL

FLOW.  COUPLED WITH STEEP MID LVL LAPSE RATES AND STRENGTHENING

SSWLY LLJ/MOISTURE TRANSPORT...SETUP MAY YIELD SPORADIC EPISODES OF

LARGE HAIL...LOCALLY DMGG WIND...AND PERHAPS A TORNADO.



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 450. MEAN STORM

MOTION VECTOR 24035.





...CORFIDI

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