

378 

WWUS20 KWNS 052358

SEL2

SPC WW 052358

MTZ000-NDZ000-SDZ000-WYZ000-060700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 502

NWS STORM PREDICTION CENTER NORMAN OK

555 PM MDT SAT SEP 5 2015



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  EASTERN AND SOUTHERN MONTANA

  WESTERN NORTH DAKOTA

  NORTHWEST SOUTH DAKOTA

  NORTHEAST WYOMING



* EFFECTIVE THIS SATURDAY AFTERNOON AND SUNDAY MORNING FROM 555

  PM UNTIL 100 AM MDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2

    INCHES IN DIAMETER POSSIBLE

  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



SUMMARY...THUNDERSTORMS EXPECTED TO FORM / INCREASE NEAR THE BIGHORN

MOUNTAINS OVER THE NEXT COUPLE HOURS...WITH ADDITIONAL STORMS

POSSIBLY FORMING NORTHWARD INTO SE MONTANA.  A FEW SUPERCELLS

CAPABLE OF SEVERE HAIL...DAMAGING WIND...AND POSSIBLY A TORNADO MAY

OCCUR.  THE STORMS SHOULD EVOLVE INTO A CLUSTER THAT SUBSEQUENTLY

MOVES / DEVELOPS NE INTO WESTERN ND LATER TONIGHT.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 105

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 85 MILES NORTH

NORTHWEST OF SHERIDAN WYOMING TO 40 MILES EAST OF DICKINSON NORTH

DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 24030.





...CORFIDI

