

587 

WWUS20 KWNS 012209

SEL8

SPC WW 012209

COZ000-KSZ000-NEZ000-020400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 458

NWS STORM PREDICTION CENTER NORMAN OK

410 PM MDT THU AUG 1 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  NORTHEAST COLORADO

  NORTHWEST KANSAS

  EXTREME SOUTHWEST NEBRASKA



* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 410 PM UNTIL

  1000 PM MDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

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

AKRON COLORADO TO 45 MILES SOUTH OF BURLINGTON COLORADO.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU8).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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 454...WW 455...WW

456...WW 457...



DISCUSSION...STORMS MOVING E OF THE FRONT RANGE ON CONVECTIVE

OUTFLOW WILL LIKELY CONTINUE FOR THE NEXT FEW HOURS WHILE SPREADING

INTO A MODERATELY UNSTABLE ENVIRONMENT ACROSS NE CO.  OTHER STORM

DEVELOPMENT IS ALSO EXPECTED ACROSS NW KS SHORTLY.  THE COMBINATION

OF INSTABILITY AND VERTICAL SHEAR IS SUFFICIENT FOR A RISK OF

ORGANIZED STORMS CAPABLE OF PRODUCING DAMAGING GUSTS AND LARGE HAIL.



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 30020.





...THOMPSON

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