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Severe Thunderstorm Watch 427
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WW0427 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
High Moderate
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.
   SEL7

   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 427
   NWS STORM PREDICTION CENTER NORMAN OK
   510 PM CDT MON JUL 21 2014

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
     NORTHWEST MINNESOTA
     EASTERN NORTH DAKOTA
     EXTREME NORTH CENTRAL AND NORTHEAST SOUTH DAKOTA

   * EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 510 PM UNTIL
     1100 PM CDT.

   * PRIMARY THREATS INCLUDE...
     WIDESPREAD DAMAGING WINDS AND ISOLATED SIGNIFICANT GUSTS TO 80
       MPH LIKELY
     SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2
       INCHES IN DIAMETER 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 15 MILES NORTH OF
   HALLOCK MINNESOTA TO 90 MILES SOUTH OF JAMESTOWN NORTH DAKOTA. 
   FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU7).

   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 426...

   DISCUSSION...MCS DEVELOPMENT IS UNDERWAY JUST W OF BIS AS CELLS
   MERGE/GROW UPSCALE AND A COLD POOL EXPANDS.  EXPECT THIS MCS TO
   ACCELERATE SOME TO THE E WHILE IT ENCOUNTERS A VERY UNSTABLE
   ENVIRONMENT WITH BOTH STRONG UPDRAFT AND DOWNDRAFT POTENTIAL. 
   THUS...THE POTENTIAL EXISTS FOR WIDESPREAD DAMAGING WINDS...SOME OF
   WHICH COULD BE SIGNIFICANT.  OTHERWISE...LARGE HAIL CAN BE EXPECTED
   WITH THE STRONGER AND MORE CELLULAR STORMS...WHILE AN ISOLATED
   TORNADO CANNOT BE RULED OUT WITH EMBEDDED CIRCULATIONS AND/OR CELL
   INTERACTIONS.

   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM
   MOTION VECTOR 26040.


   ...THOMPSON
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Page last modified: July 22, 2014
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