

836 

WWUS20 KWNS 290015

SEL9

SPC WW 290015

MNZ000-WIZ000-LMZ000-290700-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 399

NWS Storm Prediction Center Norman OK

715 PM CDT Wed Jul 28 2021



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 715 PM

  until 200 AM CDT.



* Primary threats include...

  Widespread damaging winds expected with isolated 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

