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Severe Thunderstorm Watch 199
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WW0199 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 199
   NWS STORM PREDICTION CENTER NORMAN OK
   220 PM MDT SAT MAY 31 2014

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
     EASTERN MONTANA
     A SMALL PART OF NORTH CENTRAL WYOMING

   * EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 220 PM UNTIL
     900 PM MDT.

   * PRIMARY THREATS INCLUDE...
     SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2
       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 90
   STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH
   NORTHEAST OF GLASGOW MONTANA TO 70 MILES WEST SOUTHWEST OF
   BROADUS 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...STORMS ARE INCREASING AHEAD OF A CONVECTIVELY-INDUCED
   CYCLONIC CIRCULATION OVER ERN MT.  THE AIR MASS IS MOIST AND
   MODERATELY UNSTABLE IN ADVANCE OF THE CONVECTION WITH SURFACE DEW
   POINTS IN THE MID/UPPER 50S AND MLCAPE AROUND 1500 J/KG.  SELY LOW
   LEVEL WINDS VEER WITH HEIGHT...AND ALTHOUGH SPEEDS ARE MODEST AT
   THIS TIME...SOME STRENGTHENING OF THE FLOW AND ATTENDANT VERTICAL
   SHEAR IS EXPECTED TO OCCUR LATER THIS AFTERNOON AND EVENING
   PROMOTING SEVERE STORM DEVELOPMENT.  OTHER STRONG-SEVERE STORMS ARE
   EXPECTED TO SPREAD NEWD FROM NWRN WY THROUGH THE EVENING HOURS.

   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 500. MEAN STORM
   MOTION VECTOR 23025.


   ...WEISS
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Page last modified: June 01, 2014
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