

476 

WWUS20 KWNS 262111

SEL8

SPC WW 262111

COZ000-KSZ000-NEZ000-WYZ000-270400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 448

NWS STORM PREDICTION CENTER NORMAN OK

310 PM MDT FRI JUL 26 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  NORTHEASTERN COLORADO

  EXTREME NORTHWESTERN KANSAS

  SOUTHWESTERN NEBRASKA

  SOUTHEASTERN WYOMING



* EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 310 PM UNTIL

  1000 PM MDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS WITH A FEW SIGNIFICANT GUSTS TO 75

    MPH POSSIBLE

  SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2

    INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

STATUTE MILES EAST AND WEST OF A LINE FROM 10 MILES NORTH

NORTHEAST OF TORRINGTON WYOMING TO 55 MILES SOUTHEAST OF AKRON

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 447...



DISCUSSION...TSTMS ARE INCREASING IN COVERAGE/INTENSITY AND MOVING

SEWD OFF LARAMIE RANGE IN SERN WY...ALONG AND NE OF WELL-DEFINED

BAROCLINIC BOUNDARY THAT EXTENDS SEWD OVER NERN CO.  ACTIVITY SHOULD

POSE INCREASING SVR THREAT AS IT MOVES INTO FAVORABLY

BUOYANT/SHEARED AIR MASS NE OF BOUNDARY...WITH MLCAPE TO NEAR 1500

J/KG...SELY SFC WINDS TO ENHANCE STORM-RELATIVE INFLOW...AND 40-50

KT EFFECTIVE SHEAR MAGNITUDES.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

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

MOTION VECTOR 32030.





...EDWARDS

