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147 

WWUS20 KWNS 031954

SEL3

SPC WW 031954

MTZ000-040300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 463

NWS STORM PREDICTION CENTER NORMAN OK

150 PM MDT SAT AUG 3 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  CENTRAL AND EASTERN MONTANA



* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 150 PM UNTIL

  900 PM MDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL VERY LARGE HAIL EVENTS TO 3 INCHES IN DIAMETER POSSIBLE

  SEVERAL DAMAGING WIND GUSTS WITH A FEW SIGNIFICANT GUSTS TO 75

    MPH POSSIBLE

  A FEW TORNADOES POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 105

STATUTE MILES EAST AND WEST OF A LINE FROM 80 MILES EAST

NORTHEAST OF HAVRE MONTANA TO 35 MILES WEST SOUTHWEST OF BROADUS

MONTANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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...THUNDERSTORM DEVELOPMENT IS UNDERWAY ACROSS

CENTRAL/NORTH-CENTRAL MONTANA AT THIS TIME...WITH A GRADUAL

EASTWARD/SOUTHEASTWARD INCREASE IN STORM COVERAGE EXPECTED THIS

AFTERNOON AND EVENING.  CONTINUED AFTERNOON DESTABILIZATION COMBINED

WITH INCREASING FLOW ALOFT IN CONJUNCTION WITH AN APPROACHING

SHORT-WAVE TROUGH SUGGESTS THAT SEVERE/SUPERCELL STORMS CAN BE

EXPECTED.  PRIMARY SEVERE THREATS WILL BE LARGE HAIL AND DAMAGING

WINDS...WITH AN ISOLATED TORNADO POSSIBLE AS WELL -- PARTICULARLY

LATER THIS AFTERNOON/EARLY EVENING ACROSS THE SOUTHEAST PORTION OF

THE STATE.



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

TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

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

MOTION VECTOR 26035.





...GOSS

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