SEL6
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 86
NWS STORM PREDICTION CENTER NORMAN OK
230 PM MDT TUE APR 22 2014
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
EASTERN IDAHO
SOUTHWEST MONTANA
WESTERN WYOMING
* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 230 PM UNTIL
1000 PM MDT.
* PRIMARY THREATS INCLUDE...
SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES SOUTHEAST OF
MALAD CITY IDAHO TO 40 MILES WEST NORTHWEST OF HARLOWTON 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.
&&
DISCUSSION...TSTMS EXPECTED TO INCREASE IN COVERAGE/STRENGTH THROUGH
EARLY TNGT ALONG AND AHEAD OF INTENSIFYING COLD FRONT CROSSING THE
NRN GRT BASIN/NRN RCKYS...WITH DEVELOPMENT AIDED BY UPR IMPULSE
APPROACHING FROM NV. STRENGTH OF LARGELY UNIDIRECTIONAL SSWLY WIND
FIELD AND RELATIVELY STEEP LOW TO MID-LVL LAPSE RATES SUGGEST
POTENTIAL FOR DOWNWARD MOMENTUM TRANSFER AND POSSIBLY DMGG SFC WIND
GUSTS DESPITE SPARSE MOISTURE.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400. MEAN STORM MOTION
VECTOR 21040.
...CORFIDI
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Wind damage already reported in Southeast Idaho
04/22/2014 0225 PM
4 miles SSE of Rigby, Bonneville County.
Thunderstorm wind damage, reported by trained spotter.
Trailer house on Bonneville/Jefferson County line--145n between 3900 and 4000 east, has lost its roof. 6 to 8 inch tree limbs have fallen.
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