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Severe Thunderstorm Watch 479
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WW0479 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate 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.
   SEL9

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 479
   NWS Storm Prediction Center Norman OK
   955 PM CDT Mon Aug 30 2021

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     North-central and northeastern Nebraska
     Western through southern South Dakota

   * Effective this Monday night and Tuesday morning from 955 PM
     until 500 AM CDT.

   * Primary threats include...
     Scattered large hail and isolated very large hail events to 2.5
       inches in diameter likely
     Scattered damaging winds likely with isolated significant gusts
       to 80 mph possible

   SUMMARY...Several ongoing strong to severe thunderstorms  --
   including a few supercells -- are expected to aggregate with newer
   convection tonight across southern SD and northern NE.  Until that
   occurs, large/damaging hail is possible from that activity, as well
   as more-isolated convection in northern NE and southeastern SD.  A
   thunderstorm complex is forecast to evolve and move southeastward on
   either side of a stationary front.  That activity would increase the
    severe-wind threat into southern SD and north-central/northeastern
   NE.

   The severe thunderstorm watch area is approximately along and 60
   statute miles either side of a line from 45 miles north northwest of
   Philip SD to 55 miles south of Yankton SD. 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.

   &&

   OTHER WATCH INFORMATION...CONTINUE...WW 477...WW 478...

   AVIATION...A few severe thunderstorms with hail surface and aloft to
   2.5 inches. Extreme turbulence and surface wind gusts to 70 knots. A
   few cumulonimbi with maximum tops to 550. Mean storm motion vector
   31030.

   ...Edwards
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Page last modified: August 31, 2021
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