WATCHES: Severe Thunderstorm Watch Number 512

WWUS20 KWNS 052158
SEL2
SPC WW 052158
IDZ000-MTZ000-060500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 512
NWS STORM PREDICTION CENTER NORMAN OK
355 PM MDT THU SEP 5 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
EASTERN IDAHO
SOUTHWESTERN MONTANA

* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 355 PM UNTIL
1100 PM MDT.

* PRIMARY THREATS INCLUDE...
SEVERAL DAMAGING WIND GUSTS WITH A FEW SIGNIFICANT GUSTS TO 75
MPH POSSIBLE
A FEW VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES WEST OF MALAD
CITY IDAHO TO 45 MILES NORTHWEST OF DILLON MONTANA. 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.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 511...

DISCUSSION...SVR POTENTIAL CHARACTERISTIC TO ERN PORTIONS WW 511 IS
EXPECTED TO SPREAD EWD ACROSS WW 512 AREA THROUGH REMAINDER AFTN AND
INTO EVENING...INTO AIR MASS WITH 40-50 KT EFFECTIVE SHEAR MAGNITUDE
AND AT LEAST MRGLLY FAVORABLE BUOYANCY. DAMAGING WIND AND SPORADIC
LARGE HAIL ARE EXPECTED. REF SPC MESOSCALE DISCUSSION 1839 FOR
ADDITIONAL/INITIAL METEOROLOGICAL DETAILS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 21035.


...EDWARDS

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