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Severe Thunderstorm Watch 159
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WW0159 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Low
Severe Hail 2"+ Hail
Moderate Low

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL9
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 159
   NWS STORM PREDICTION CENTER NORMAN OK
   300 PM MDT MON MAY 13 2013
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   
   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
     CENTRAL IDAHO
     WESTERN MONTANA
     EXTREME NORTHEAST OREGON
     EXTREME SOUTHEAST WASHINGTON
   
   * EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 300 PM UNTIL
     1000 PM MDT.
   
   * PRIMARY THREATS INCLUDE...
     SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
     SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE
   
   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES NORTH
   NORTHWEST OF BAKER OREGON TO 55 MILES EAST NORTHEAST OF GREAT
   FALLS 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.
   
   &&
   
   DISCUSSION...THUNDERSTORMS ARE DEVELOPING OVER NERN OREGON AND
   ADJACENT PARTS OF CENTRAL ID IN ADVANCE OF A STRONG SHORT WAVE
   TROUGH MOVING EWD INTO WA/OREGON.  SUFFICIENT MOISTURE WITH SURFACE
   DEW POINTS IN THE 40S AND A DEEP MIXED LAYER AND STEEP LAPSE RATES
   WILL ENHANCE POTENTIAL FOR DAMAGING WIND GUSTS AND HAIL WITH
   STRONGER HIGH-BASED STORMS.  THE ACTIVITY IS EXPECTED TO SPREAD
   RAPIDLY ENEWD THROUGH THE EVENING HOURS OVER PARTS OF WRN MT. 
   ADDITIONAL STORMS MAY ALSO FORM EWD OVER THE CENTRAL MT MOUNTAINS
   WITHIN THE NEXT SEVERAL HOURS...AND MODEL GUIDANCE SUGGESTS AN
   ADDITIONAL WATCH FARTHER EAST IN MT MAY BE NEEDED DURING THE LATE
   AFTERNOON OR EVENING.
   
   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 400. MEAN STORM
   MOTION VECTOR 24040.
   
   
   ...WEISS
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