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WWUS20 KWNS 280100

SEL7

SPC WW 280100

IAZ000-MNZ000-WIZ000-280700-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 397

NWS Storm Prediction Center Norman OK

805 PM CDT Tue Jul 27 2021



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Northeast Iowa

  Southeast Minnesota

  Southwest Wisconsin



* Effective this Tuesday night and Wednesday morning from 805 PM

  until 200 AM CDT.



* Primary threats include...

  Scattered large hail and isolated very large hail events to 3

    inches in diameter likely

  Scattered damaging winds and isolated significant gusts to 75

    mph possible

  A tornado or two possible



SUMMARY...A few supercells should become established across a

portion of the Upper Mississippi Valley before developing into a

southward-moving cluster this evening.



The severe thunderstorm watch area is approximately along and 50

statute miles east and west of a line from 55 miles north of

Rochester MN to 40 miles west of Dubuque IA. For a complete

depiction of the watch see the associated watch outline update

(WOUS64 KWNS WOU7).



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 396...



AVIATION...A few severe thunderstorms with hail surface and aloft to

3 inches. Extreme turbulence and surface wind gusts to 65 knots. A

few cumulonimbi with maximum tops to 600. Mean storm motion vector

33020.



...Grams

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