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Severe Thunderstorm Watch 220
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WW0220 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.
   SEL0

   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 220
   NWS STORM PREDICTION CENTER NORMAN OK
   145 PM MDT WED JUN 4 2014

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
     SOUTHEAST MONTANA
     SOUTHWEST NORTH DAKOTA
     WESTERN SOUTH DAKOTA
     EASTERN WYOMING

   * EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 145 PM
     UNTIL 800 PM MDT.

   * PRIMARY THREATS INCLUDE...
     ISOLATED VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE
     ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60
   STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHWEST OF
   BAKER MONTANA TO 10 MILES SOUTH SOUTHWEST OF CHEYENNE WYOMING. 
   FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU0).

   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 218...WW 219...

   DISCUSSION...VIGOROUS STORM DEVELOPMENT TAKING PLACE ACROSS THE
   HIGHER TERRAIN OF MT/WY ATTM AS A SHORTWAVE TROUGH CROSSES THE
   CONTINENTAL DIVIDE AND AIDS LARGE SCALE ASCENT. EXPECT THIS ACTIVITY
   TO SPREAD EAST INTO AN AXIS OF MODEST INSTABILITY AND SUPPORTIVE
   STORM-RELATIVE INFLOW AND UPSLOPE FLOW FROM SERN MT TO SERN WY.
   DEEP-LAYER VERTICAL SHEAR IN THE 30-40KT RANGE WILL SUPPORT UPDRAFT
   ORGANIZATION AND PERSISTENCE WITH ATTENDANT THREATS OF LARGE HAIL
   AND HIGH WINDS WITH TIME. SOME TORNADO POTENTIAL WILL EXIST FOR ANY
   DISCRETE CELLS GIVEN SOME HODOGRAPH CURVATURE IN THE STORM UPDRAFT
   LAYER.

   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 450. MEAN STORM
   MOTION VECTOR 27030.


   ...CARBIN
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Page last modified: June 05, 2014
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