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URGENT - IMMEDIATE BROADCAST REQUESTED

Tornado Watch Number 522

NWS Storm Prediction Center Norman OK

530 PM CDT Thu Jul 18 2019



The NWS Storm Prediction Center has issued a



* Tornado Watch for portions of

  Extreme northern Iowa

  Southern Minnesota

  Extreme southeastern South Dakota



* Effective this Thursday afternoon from 530 PM until Midnight

  CDT.



* Primary threats include...

  A couple tornadoes possible

  Scattered large hail and isolated very large hail events to 2

    inches in diameter possible

  Scattered damaging wind gusts to 70 mph possible



SUMMARY...Thunderstorm development is underway along a weak wind

shift from southeastern South Dakota eastward near the

Minnesota/Iowa border.  The storm environment will favor supercells

capable of producing large hail, damaging winds, and a couple of

tornadoes through late evening as storms spread generally eastward.



The tornado watch area is approximately along and 35 statute miles

north and south of a line from 10 miles north of Sioux Falls SD to

35 miles north northeast of Mason City IA. For a complete depiction

of the watch see the associated watch outline update (WOUS64 KWNS

WOU2).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



REMEMBER...A Tornado Watch means conditions are favorable for

tornadoes and 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.



&&



AVIATION...Tornadoes and 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 650. Mean

storm motion vector 28025.



...Thompson

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