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Severe Thunderstorm Watch 644
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WW0644 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
Low Very Low

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL4

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 644
   NWS Storm Prediction Center Norman OK
   1245 AM CDT Wed Sep 11 2019

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Northern Iowa
     Southern Minnesota

   * Effective this Wednesday morning from 1245 AM until 600 AM CDT.

   * Primary threats include...
     Scattered damaging winds and isolated significant gusts to 75
       mph possible
     Isolated large hail events to 1 inch in diameter possible
     A tornado or two possible

   SUMMARY...A complex of thunderstorms, having produced measured
   severe winds and a brief tornado in the Sioux Falls area, is
   expected to maintain some severe threat for a few more hours as it
   moves astride a sharply defined front located very near the
   Minnesota/Iowa border.  Damaging gusts will be the main concern,
   though a tornado cannot be ruled out, and isolated hail also is
   possible with cells ahead of the main complex.

   The severe thunderstorm watch area is approximately along and 40
   statute miles north and south of a line from 25 miles west southwest
   of Fairmont MN to 45 miles northeast of Mason City IA. For a
   complete depiction of the watch see the associated watch outline
   update (WOUS64 KWNS WOU4).

   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 643...

   AVIATION...A few severe thunderstorms with hail surface and aloft to
   1 inch. Extreme turbulence and surface wind gusts to 65 knots. A few
   cumulonimbi with maximum tops to 500. Mean storm motion vector
   26035.

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