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521 

WWUS20 KWNS 131843

SEL9

SPC WW 131843

MTZ000-NEZ000-SDZ000-WYZ000-140200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 249

NWS STORM PREDICTION CENTER NORMAN OK

1245 PM MDT MON JUN 13 2016



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  SOUTHEAST MONTANA

  WESTERN NEBRASKA

  WESTERN SOUTH DAKOTA

  EASTERN WYOMING



* EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 1245 PM UNTIL

  800 PM MDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2.5

    INCHES IN DIAMETER POSSIBLE

  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A TORNADO OR TWO POSSIBLE



SUMMARY...STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED TO INCREASE

AND SPREAD GENERALLY EAST-NORTHEASTWARD ACROSS THE REGION THROUGH

THE EVENING HOURS. THIS DEVELOPMENT WILL BE AIDED BY INCREASING

FORCING FOR ASCENT/VERTICAL SHEAR AND THE PRESENCE OF MULTIPLE

RESIDUAL BOUNDARIES. LARGE HAIL AND DAMAGING WINDS ARE EXPECTED TO

BE THE PRIMARY HAZARDS ALTHOUGH A TORNADO OR TWO COULD OCCUR LATER

THIS AFTERNOON AND EVENING.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHEAST OF

MILES CITY MONTANA TO 25 MILES WEST SOUTHWEST OF SIDNEY NEBRASKA.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU9).



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.



&&



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 23025.





...GUYER

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