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Severe Thunderstorm Watch 643
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WW0643 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low 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.
   SEL3

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 643
   NWS Storm Prediction Center Norman OK
   835 PM CDT Tue Sep 10 2019

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Northwest Iowa
     Southwest Minnesota
     Northeast Nebraska
     Southeast South Dakota

   * Effective this Tuesday night and Wednesday morning from 835 PM
     until 400 AM CDT.

   * Primary threats include...
     Scattered damaging winds and isolated significant gusts to 75
       mph likely
     Scattered large hail and isolated very large hail events to 2
       inches in diameter possible
     A tornado or two possible

   SUMMARY...Clusters of storms will continue to merge and grow upscale
   into a larger convective system that will spread eastward overnight
   with an attendant threat for damaging winds and large hail.  In the
   short term, a supercell moving into Bon Homme County South Dakota
   will pose a threat for a tornado or two before being overtaken and
   merging with the clusters to the west.

   The severe thunderstorm watch area is approximately along and 45
   statute miles north and south of a line from 35 miles northwest of
   Oneill NE to 20 miles north northeast of Spencer IA. For a complete
   depiction of the watch see the associated watch outline update
   (WOUS64 KWNS WOU3).

   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...This severe thunderstorm watch replaces
   severe thunderstorm watch number 642. Watch number 642 will not
   be in effect after 835 PM CDT. CONTINUE...WW 640...WW 641...

   AVIATION...A few severe thunderstorms with hail surface and aloft to
   2 inches. Extreme turbulence and surface wind gusts to 65 knots. A
   few cumulonimbi with maximum tops to 550. Mean storm motion vector
   27025.

   ...Thompson
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Page last modified: September 11, 2019
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