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WWUS20 KWNS 101949

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URGENT - IMMEDIATE BROADCAST REQUESTED

Tornado Watch Number 640

NWS Storm Prediction Center Norman OK

150 PM MDT Tue Sep 10 2019



The NWS Storm Prediction Center has issued a



* Tornado Watch for portions of

  Northern Nebraska

  Southern South Dakota

  Eastern Wyoming



* Effective this Tuesday afternoon and evening from 150 PM until

  900 PM MDT.



* Primary threats include...

  A couple tornadoes possible

  Scattered large hail likely with isolated very large hail events

    to 3 inches in diameter possible

  Scattered damaging wind gusts to 70 mph likely



SUMMARY...Thunderstorms will intensify this afternoon over eastern

Wyoming, and along a boundary over northern Nebraska.  These storms

will affect the watch area through the evening, posing a risk of

large hail, damaging wind gusts, and a few tornadoes.



The tornado watch area is approximately along and 60 statute miles

north and south of a line from 45 miles northwest of Douglas WY to

30 miles northeast of Ainsworth NE. For a complete depiction of the

watch see the associated watch outline update (WOUS64 KWNS WOU0).



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 3 inches. Extreme turbulence and surface wind

gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean

storm motion vector 26030.



...Hart

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