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WWUS20 KWNS 270457

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URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 451

NWS Storm Prediction Center Norman OK

1200 AM CDT Thu Jun 27 2019



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Southern North Dakota

  South Dakota



* Effective this Thursday morning from Midnight until 700 AM CDT.



* Primary threats include...

  Scattered damaging wind gusts to 70 mph possible

  Isolated very large hail events to 2 inches in diameter possible

  A tornado or two possible



SUMMARY...A well-organized line of storms is expected to continue

generally eastward overnight across northern/central South Dakota

and far southern North Dakota. Damaging winds and severe hail are

possible.



The severe thunderstorm watch area is approximately along and 90

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

Rapid City SD to 30 miles south of Aberdeen SD. For a complete

depiction of the watch see the associated watch outline update

(WOUS64 KWNS WOU1).



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 450...



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 550. Mean storm motion vector

26035.



...Guyer

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