WATCHES: Severe Thunderstorm Watch Number 419

WWUS20 KWNS 172054
SEL9
SPC WW 172054
IDZ000-MTZ000-180400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 419
NWS STORM PREDICTION CENTER NORMAN OK
245 PM MDT WED JUL 17 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

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

* EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 245 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 110
STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES EAST
SOUTHEAST OF DILLON MONTANA TO 40 MILES NORTHWEST OF CUT BANK
MONTANA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).

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 416...WW 417...WW 418...

DISCUSSION...TSTMS NOW FORMING OVER THE HIGHER TERRAIN OF CNTRL/NRN
ID AND WRN MT EXPECTED TO INCREASE AND MOVE/DEVELOP ENE OVER THE
NEXT SEVERAL HOURS AS HEATING CONTINUES ALONG SRN FRINGE OF UPR
IMPULSE MOVING NEWD INTO BC/AB. 40+ KT SWLY DEEP SHEAR AND PRESENCE
OF AMPLE LOW-LVL MOISTURE/LOW-LVL SSELY FLOW E OF THE MOUNTAINS
SHOULD SUPPORT DEVELOPMENT ENE INTO THE NRN HIGH PLNS. POTENTIAL
WILL EXIST FOR A FEW SUPERCELLS AND SUSTAINED STORM CLUSTERS WITH
LARGE HAIL...LOCALLY DMGG WIND...AND PERHAPS A TORNADO THROUGH MID
EVE.

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 25025.


...CORFIDI

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