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Severe Thunderstorm Watch 439
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WW0439 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 439
   NWS STORM PREDICTION CENTER NORMAN OK
   255 PM MDT THU JUL 24 2014

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
     NORTHEAST MONTANA
     WESTERN NORTH DAKOTA

   * EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 255 PM UNTIL
     900 PM MDT.

   * PRIMARY THREATS INCLUDE...
     SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2.5
       INCHES IN DIAMETER POSSIBLE
     SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
     A TORNADO OR TWO POSSIBLE

   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 80 MILES WEST
   SOUTHWEST OF GLASGOW MONTANA TO 70 MILES EAST OF WILLISTON NORTH
   DAKOTA.  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...STORMS ARE EXPECTED TO INCREASE OVER NORTHEAST MT THIS
   AFTERNOON IN RESPONSE TO DYNAMIC FORCING FOR ASCENT IN ADVANCE OF A
   STRONG UPPER LOW/SHORT WAVE TROUGH MOVING ENEWD ACROSS SWRN CANADA
   AND THE NRN ROCKIES.  THE ENVIRONMENT OVER NERN MT IS WARM/MOIST AND
   UNSTABLE WITH SURFACE DEW POINTS NEAR 60 AND CAPE TO 2000 J/KG. 
   STRONG WSWLY FLOW ALOFT/DEEP LAYER SHEAR WILL SUPPORT SUPERCELL
   DEVELOPMENT WITH POTENTIAL FOR VERY LARGE HAIL AND DAMAGING WIND
   GUSTS.  THERE IS POTENTIAL FOR A SHORT BOWING LINE TO DEVELOP WITH
   TIME AS COLD POOLS MAY CONSOLIDATE DURING THE EVENING HOURS.

   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
   MOTION VECTOR 24035.


   ...WEISS
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Page last modified: July 25, 2014
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