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Particularly Dangerous Situation (PDS) Severe Thunderstorm Watch 399
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WW0399 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Low
Severe Wind 65 kt+ Wind
High High
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 399...CORRECTED
   NWS Storm Prediction Center Norman OK
   725 PM CDT Wed Jul 28 2021

   CORRECTED TO ADD PDS TEXT

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     parts of east-central Minnesota
     much of Wisconsin
     Lake Michigan

   * Effective this Wednesday night and Thursday morning from 725 PM
     until 200 AM CDT.

   ...THIS IS A PARTICULARLY DANGEROUS SITUATION...

   * Primary threats include...
     Widespread damaging winds expected with scattered significant
       gusts to 90 mph likely
     Scattered large hail likely with isolated very large hail events
       to 2 inches in diameter possible
     A tornado or two possible

   SUMMARY...Strong/severe thunderstorms are forecast to increase in
   coverage over the next 1 to 2 hours, evolving into a large,
   well-organized cluster/possible derecho while moving rapidly
   southeastward.  Along with potential for a few tornadoes, widespread
   damaging winds are expected -- including a few significant gusts
   possibly reaching 90 MPH locally.

   The severe thunderstorm watch area is approximately along and 70
   statute miles either side of a line from 65 miles southwest of
   Duluth MN to 40 miles northeast of Milwaukee WI. 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 398...

   AVIATION...A few severe thunderstorms with hail surface and aloft to
   2 inches. Extreme turbulence and surface wind gusts to 80 knots. A
   few cumulonimbi with maximum tops to 550. Mean storm motion vector
   30050.

   ...Goss

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Page last modified: July 29, 2021
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