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Severe Thunderstorm Watch 421
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WW0421 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.
   SEL1

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 421
   NWS Storm Prediction Center Norman OK
   330 PM CDT Wed Jul 19 2017

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Northeast Iowa
     Southeast Minnesota
     Southwest Wisconsin

   * Effective this Wednesday afternoon and evening from 330 PM
     until 900 PM CDT.

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

   SUMMARY...A fast-moving bow echo over southern MN will track across
   the watch area late this afternoon, posing a threat of damaging wind
   gusts and perhaps hail.

   The severe thunderstorm watch area is approximately along and 35
   statute miles north and south of a line from 40 miles southwest of
   Rochester MN to 125 miles east southeast of Rochester MN. 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 420...

   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 500. Mean storm motion vector
   29040.

   ...Hart
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Page last modified: July 20, 2017
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