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WWUS20 KWNS 262104

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SPC WW 262104

COZ000-NEZ000-SDZ000-WYZ000-270300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 358

NWS STORM PREDICTION CENTER NORMAN OK

305 PM MDT THU JUN 26 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  NORTHEAST COLORADO

  WESTERN NEBRASKA

  WESTERN SOUTH DAKOTA

  SOUTHEAST WYOMING



* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 305 PM UNTIL

  900 PM MDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  ISOLATED VERY LARGE HAIL EVENTS TO 2.5 INCHES IN DIAMETER

    POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 200

STATUTE MILES EITHER SIDE OF A LINE FROM 75 MILES NORTH NORTHWEST

OF TORRINGTON WYOMING TO 25 MILES EAST NORTHEAST OF CHADRON

NEBRASKA.  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 357...



DISCUSSION...STORMS SHOULD CONTINUE TO DEVELOP NEAR LEE

TROUGH/DRYLINE...AND ACROSS BLACK HILLS AND FRONT RANGE...INTO THE

EVENING AS FAVORABLE LARGE SCALE FORCING FOR ASCENT SPREADS EAST

FROM THE ROCKIES. ACTIVITY WILL DEVELOP EAST INTO INSTABILITY AXIS

WHERE MLCAPE OF 2500-3000 J/KG SHOULD FAVOR INCREASINGLY STOUT STORM

UPDRAFTS IN THE PRESENCE OF WEAK TO MODEST SHEAR. INITIAL CELLS WILL

LIKELY HAVE SOME CHANCE FOR PRODUCING STRONG WINDS AND LARGE HAIL

AND...WITH TIME...EXPECT STORM MERGERS TO RESULT IN A SMALL MCS OR

TWO SPREADING EAST AND POSING A CONTINUING CHANCE FOR STRONG/SEVERE

WINDS.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 25020.





...CARBIN

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