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WWUS20 KWNS 102322

SEL2

SPC WW 102322

SDZ000-110300-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 642

NWS Storm Prediction Center Norman OK

625 PM CDT Tue Sep 10 2019



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Parts of southern South Dakota



* Effective this Tuesday evening from 625 PM until 1000 PM CDT.



* Primary threats include...

  Scattered damaging winds and isolated significant gusts to 75

    mph possible

  Scattered large hail and isolated very large hail events to 2.5

    inches in diameter possible

  A tornado or two possible



SUMMARY...Clusters of storms will continue to spread eastward from

south central South Dakota, along the immediate cool side of a

surface front.  Large hail and damaging winds will be the main

threats, though an isolated tornado cannot be ruled out this

evening.



The severe thunderstorm watch area is approximately along and 30

statute miles north and south of a line from 30 miles south

southwest of Chamberlain SD to 15 miles south of Mitchell SD. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU2).



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 640...WW 641...



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

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

few cumulonimbi with maximum tops to 550. Mean storm motion vector

27025.



...Thompson

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