

646 

WWUS20 KWNS 092249

SEL6

SPC WW 092249

MTZ000-100600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 436

NWS STORM PREDICTION CENTER NORMAN OK

450 PM MDT TUE AUG 9 2016



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  MONTANA



* EFFECTIVE THIS TUESDAY AFTERNOON FROM 450 PM UNTIL MIDNIGHT

  MDT.



* PRIMARY THREATS INCLUDE...

  ISOLATED VERY LARGE HAIL EVENTS TO 2.5 INCHES IN DIAMETER

    POSSIBLE

  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



SUMMARY...INCREASING FORCING AND VERTICAL SHEAR IN CONJUNCTION WITH

A MODESTLY MOIST AND UNSTABLE ENVIRONMENT WILL SUPPORT SUPERCELLS

CAPABLE OF LARGE HAIL ESPECIALLY ACROSS NORTH-CENTRAL AND

EAST-CENTRAL MONTANA. ONE OR MORE SMALL-SCALE CLUSTERS MAY ALSO

EVOLVE THIS EVENING WITH A DAMAGING WIND RISK.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES WEST

NORTHWEST OF GREAT FALLS MONTANA TO 140 MILES EAST NORTHEAST OF

LEWISTOWN MONTANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 435...



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 23030.





...GUYER

