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Severe Thunderstorm Watch 309
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WW0309 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Low
Severe Hail 2"+ Hail
Moderate Moderate

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 309
   NWS STORM PREDICTION CENTER NORMAN OK
   105 PM MDT THU JUN 13 2013

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

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

   * EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 105 PM UNTIL
     900 PM MDT.

   * PRIMARY THREATS INCLUDE...
     SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 3
       INCHES IN DIAMETER POSSIBLE
     SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 100
   STATUTE MILES EITHER SIDE OF A LINE FROM 50 MILES NORTHWEST OF
   GLASGOW MONTANA TO 30 MILES EAST SOUTHEAST OF LANDER WYOMING. 
   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 306...WW 307...WW 308...

   DISCUSSION...EXPECT ISOLATED TO WIDELY SCATTERED STRONG TO SEVERE
   STORMS TO CONTINUE TO POSE A THREAT OF POTENTIALLY VERY LARGE HAIL
   AND LOCALLY HIGH WINDS ACROSS NRN WY AND PARTS OF CENTRAL AND ERN MT
   THROUGH THE AFTERNOON AND INTO THIS EVENING. LOW AMPLITUDE IMPULSES
   EMANATING FROM A STRONG LARGER SCALE TROUGH HAVE BEEN AIDING STORM
   DEVELOPMENT ACROSS THE HIGH TERRAIN AND ADJACENT LOWER ELEVATIONS
   WHERE INSTABILITY CONTINUES TO INCREASE WITH HEATING OF THE DAY.
   SHEAR PROFILES ARE ALREADY ADEQUATE FOR SUPERCELLS WITH ABOUT 40KT
   OF SWLY MID-LEVEL FLOW FORECAST TO INCREASE TO OVER 50KT THROUGH THE
   LATE AFTERNOON. STORMS DEVELOPING IN THIS ENVIRONMENT WILL HAVE THE
   TENDENCY TO ACQUIRE ROTATION WITH BOTH HAIL AND WIND HAZARDS
   POSSIBLE. AN ISOLATED TORNADO CANNOT BE RULED OUT GIVEN BACKED LOW
   LEVEL FLOW AND RELATIVELY MOIST BOUNDARY LAYER EAST OF THE HIGHER
   TERRAIN.

   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
   MOTION VECTOR 22035.


   ...CARBIN
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