

540 

WWUS20 KWNS 151829

SEL1

SPC WW 151829

MTZ000-160200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 461

NWS STORM PREDICTION CENTER NORMAN OK

1230 PM MDT FRI AUG 15 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  WESTERN AND CENTRAL MONTANA



* EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 1230 PM UNTIL

  800 PM MDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES EAST

NORTHEAST OF CUT BANK MONTANA TO 40 MILES EAST OF BUTTE MONTANA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU1).



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...STORMS ARE INCREASING OVER WRN MT ALONG THE LEADING

EDGE OF LARGE SCALE ASCENT IN ADVANCE OF AN UPPER LOW MOVING ACROSS

THE PACIFIC NORTHWEST.  STRONG HEATING AND ATTENDANT

DESTABILIZATION/STEEPENING OF LOW-LEVEL LAPSE RATES WILL ENHANCE

SEVERE STORM POTENTIAL AS MLCAPE REACHES 1500-2000 J/KG THIS

AFTERNOON.  EFFECTIVE BULK SHEAR OF 30-35 KT WILL SUPPORT ORGANIZED

CONVECTIVE STRUCTURES/ISOLATED SUPERCELLS WITH STRONGER STORMS

CAPABLE OF PRODUCING DAMAGING WIND GUSTS AND OCCASIONAL HAIL.

ACTIVITY WILL SPREAD NEWD THROUGH THE EVENING HOURS.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM

MOTION VECTOR 22025.





...WEISS



318 

WWUS20 KWNS 151829

SEL1

SPC WW 151829

MTZ000-160200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 461

NWS STORM PREDICTION CENTER NORMAN OK

1230 PM MDT FRI AUG 15 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  WESTERN AND CENTRAL MONTANA



* EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 1230 PM UNTIL

  800 PM MDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES EAST

NORTHEAST OF CUT BANK MONTANA TO 40 MILES EAST OF BUTTE MONTANA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU1).



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...STORMS ARE INCREASING OVER WRN MT ALONG THE LEADING

EDGE OF LARGE SCALE ASCENT IN ADVANCE OF AN UPPER LOW MOVING ACROSS

THE PACIFIC NORTHWEST.  STRONG HEATING AND ATTENDANT

DESTABILIZATION/STEEPENING OF LOW-LEVEL LAPSE RATES WILL ENHANCE

SEVERE STORM POTENTIAL AS MLCAPE REACHES 1500-2000 J/KG THIS

AFTERNOON.  EFFECTIVE BULK SHEAR OF 30-35 KT WILL SUPPORT ORGANIZED

CONVECTIVE STRUCTURES/ISOLATED SUPERCELLS WITH STRONGER STORMS

CAPABLE OF PRODUCING DAMAGING WIND GUSTS AND OCCASIONAL HAIL.

ACTIVITY WILL SPREAD NEWD THROUGH THE EVENING HOURS.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM

MOTION VECTOR 22025.





...WEISS

