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WWUS20 KWNS 191735

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URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 420

NWS Storm Prediction Center Norman OK

1235 PM CDT Wed Jul 19 2017



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Northern Iowa

  Southern Minnesota



* Effective this Wednesday afternoon and evening from 1235 PM

  until 600 PM CDT.



* Primary threats include...

  Widespread damaging winds likely with isolated significant gusts

    to 80 mph possible

  Scattered large hail and isolated very large hail events to 2

    inches in diameter possible

  A tornado or two possible



SUMMARY...A small but intense bow echo will move rapidly

east-southeastward across the watch area this afternoon.  Damaging

winds along the leading edge of the bow are the primary risk, along

with hail and perhaps a tornado or two.



The severe thunderstorm watch area is approximately along and 45

statute miles north and south of a line from 55 miles west northwest

of Worthington MN to 25 miles northeast of Mason City IA. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU0).



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 419...



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

2 inches. Extreme turbulence and surface wind gusts to 70 knots. A

few cumulonimbi with maximum tops to 500. Mean storm motion vector

29040.



...Hart

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