WATCHES: Severe Thunderstorm Watch Number 456

WWUS20 KWNS 011925
SEL6
SPC WW 011925
IDZ000-MTZ000-020400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 456
NWS STORM PREDICTION CENTER NORMAN OK
125 PM MDT THU AUG 1 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHEAST IDAHO
WESTERN AND CENTRAL MONTANA

* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 125 PM UNTIL
1000 PM MDT.

* PRIMARY THREATS INCLUDE...
SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2
INCHES IN DIAMETER POSSIBLE
SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES NORTH
NORTHWEST OF SALMON IDAHO TO 40 MILES NORTHEAST OF BILLINGS
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 454...WW 455...

DISCUSSION...HEATING ALONG THE HIGH TERRAIN COUPLED WITH INCREASED
FORCING FOR ASCENT/DCVA ATTENDANT TO A SHORT-WAVE TROUGH APPROACHING
THE REGION FROM THE SW WILL YIELD AN INCREASE IN STORM COVERAGE AND
INTENSITY THIS AFTERNOON. WHILE THE ENVIRONMENT IS NOT OVERLY
MOIST...THE PRESENCE OF STEEP LOW TO MIDLEVEL LAPSE RATES AND AMPLE
VERTICAL SHEAR WILL SUPPORT SUPERCELLS AND BOWING STRUCTURES CAPABLE
OF DAMAGING WINDS AND LARGE HAIL.

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 450. MEAN STORM
MOTION VECTOR 26025.


...MEAD

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