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WWUS20 KWNS 180259

SEL8

SPC WW 180259

IAZ000-MNZ000-WIZ000-180900-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 278

NWS Storm Prediction Center Norman OK

1000 PM CDT Thu Jun 17 2021



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  North-central/Northeast Iowa

  Southeast Minnesota

  Central/Southern Wisconsin



* Effective this Thursday night and Friday morning from 1000 PM

  until 400 AM CDT.



* Primary threats include...

  Scattered damaging wind gusts to 70 mph likely

  Scattered large hail and isolated very large hail events to 2

    inches in diameter possible

  A tornado or two possible



SUMMARY...Organized clusters of storms are expected to accelerate

east-southeastward across central/southern Wisconsin, while

additional storms develop across southeast Minnesota and northern

Iowa late this evening into the overnight. Damaging winds and severe

hail can be expected through at least the early/middle part of the

overnight.



The severe thunderstorm watch area is approximately along and 70

statute miles north and south of a line from 35 miles north

northwest of Mason City IA to 35 miles north of Milwaukee WI. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU8).



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 276...WW 277...



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

2 inches. Extreme turbulence and surface wind gusts to 60 knots. A

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

29040.



...Guyer

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