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Severe Thunderstorm Watch 301
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WW0301 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.
   SEL1

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 301
   NWS Storm Prediction Center Norman OK
   410 PM MDT Sat Jul 21 2018

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Far Eastern Montana
     Western North Dakota
     Western South Dakota
     Northeast Wyoming

   * Effective this Saturday afternoon and evening from 410 PM until
     1100 PM MDT.

   * Primary threats include...
     Scattered large hail likely with isolated very large hail events
       to 2.5 inches in diameter possible
     Isolated damaging wind gusts to 70 mph possible
     A tornado or two possible

   SUMMARY...Storms will continue to develop and intensify in several
   different areas across the region, including a well-organized
   cluster of storms already ongoing across northeast Montana into
   northwest North Dakota. Large hail and damaging winds will be the
   primary concerns as storms, including a few supercells, spread
   east/southeastward across a relatively narrow axis of moderately
   unstable air through this evening.

   The severe thunderstorm watch area is approximately along and 55
   statute miles east and west of a line from 25 miles north northeast
   of Sidney MT to 55 miles southwest of Rapid City SD. For a complete
   depiction of the watch see the associated watch outline update
   (WOUS64 KWNS WOU1).

   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 300...

   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 550. Mean storm motion vector
   29025.

   ...Guyer
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Page last modified: July 22, 2018
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