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WWUS20 KWNS 160230

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NEZ000-WYZ000-160800-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 424

NWS STORM PREDICTION CENTER NORMAN OK

830 PM MDT TUE JUL 15 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  WESTERN NEBRASKA PANHANDLE

  SOUTHEAST WYOMING



* EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 830 PM

  UNTIL 200 AM MDT.



* PRIMARY THREATS INCLUDE...

  ISOLATED VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE

  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH

NORTHEAST OF DOUGLAS WYOMING TO 15 MILES SOUTHWEST OF CHEYENNE

WYOMING.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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...SMALL AREA OF SEVERE STORM POTENTIAL WILL EXIST OVER

THE NEXT FEW HOURS ACROSS SOUTHEAST WY AND PERHAPS INTO WESTERN NEB

PANHANDLE. SHORT WAVE DIGGING SOUTHEAST FROM MT/WY WILL SUSTAIN

LARGE SCALE ASCENT AND SHEAR ACROSS NARROW INSTABILITY CORRIDOR

ACROSS SOUTHEAST WY. SHEAR ON THE ORDER OF 40-50KT AND MLCAPE NEAR

1000 J/KG SHOULD BE ADEQUATE TO SUSTAIN ORGANIZED UPDRAFTS WITH SOME

LARGE HAIL AND DAMAGING WIND GUST POTENTIAL.



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 29030.





...CARBIN

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