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WWUS20 KWNS 221703

SEL3

SPC WW 221703

WYZ000-230000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 343

NWS STORM PREDICTION CENTER NORMAN OK

1100 AM MDT SAT JUN 22 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* TORNADO WATCH FOR PORTIONS OF

  CENTRAL AND EASTERN WYOMING



* EFFECTIVE THIS SATURDAY MORNING AND EVENING FROM 1100 AM UNTIL

  600 PM MDT.



* PRIMARY THREATS INCLUDE...

  A FEW TORNADOES POSSIBLE

  NUMEROUS LARGE HAIL EVENTS LIKELY WITH A FEW VERY LARGE HAIL

    EVENTS TO 3 INCHES IN DIAMETER POSSIBLE

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 95 STATUTE

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

GILLETTE WYOMING TO 20 MILES SOUTH SOUTHWEST OF LARAMIE WYOMING.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU3).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



&&



DISCUSSION...AIDED BY FORCING FOR UPWARD VERTICAL MOTION ASSOCIATED

WITH A SHORT WAVE TROUGH ADVANCING NORTHEAST OF THE GREAT BASIN...

INCREASING THUNDERSTORM DEVELOPMENT IS EXPECTED IN A DESTABILIZING

ENVIRONMENT ACROSS AND TO THE EAST OF THE HIGHER TERRAIN OF WYOMING.

 BENEATH MODESTLY STRONG CYCLONIC MID/UPPER FLOW...DEEP LAYER SHEAR

IS MORE THAN SUFFICIENT FOR SUPERCELLS CAPABLE OF PRODUCING VERY

LARGE HAIL.  A FEW TORNADOES ARE ALSO POSSIBLE... PARTICULARLY TO

THE LEE OF THE HIGHER TERRAIN...ACROSS EASTERN WYOMING.  ACTIVITY

MAY CONSOLIDATE AND ORGANIZE INTO LARGER STORM CLUSTERS OR A BROKEN

SQUALL LINE ACROSS THE HIGH PLAINS LATE THIS AFTERNOON.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 24025.





...KERR

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