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WWUS20 KWNS 152035

SEL5

SPC WW 152035

COZ000-NEZ000-WYZ000-160300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 315

NWS STORM PREDICTION CENTER NORMAN OK

235 PM MDT SAT JUN 15 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  EAST CENTRAL AND NORTHEAST COLORADO

  THE SOUTHWEST NEBRASKA PANHANDLE

  EXTREME SOUTHEAST WYOMING



* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 235 PM UNTIL

  900 PM MDT.



* PRIMARY THREATS INCLUDE...

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

    INCHES IN DIAMETER POSSIBLE

  A FEW DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A FEW TORNADOES POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTHEAST OF

CHEYENNE WYOMING TO 55 MILES SOUTH SOUTHEAST OF LIMON COLORADO.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU5).



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.



&&



DISCUSSION...THE EARLY STAGES OF THUNDERSTORM DEVELOPMENT ARE

UNDERWAY ALONG THE FRONT RANGE IN CO...AND JUST E OF THE LARAMIE

RANGE IN WY.  EXPECT A COUPLE OF SUPERCELLS TO EMERGE FROM THE

DEVELOPING STORMS IN THE NEXT COUPLE OF HOURS...WITH SUFFICIENT

DEEP-LAYER SHEAR AND INSTABILITY FOR LARGE HAIL/DAMAGING WINDS.  THE

TORNADO RISK IS MORE MARGINAL/UNCERTAIN...THOUGH AN ISOLATED WEAK

TORNADO OR TWO CANNOT BE RULED OUT ACROSS NE CO.



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 500. MEAN STORM

MOTION VECTOR 28020.





...THOMPSON

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