

693 

WWUS20 KWNS 302345

SEL8

SPC WW 302345

NDZ000-310500-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 478

NWS Storm Prediction Center Norman OK

645 PM CDT Mon Aug 30 2021



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Central and southern North Dakota



* Effective this Monday night from 645 PM until Midnight CDT.



* Primary threats include...

  Scattered large hail and isolated very large hail events to 2.5

    inches in diameter possible

  Isolated significant damaging wind gusts to 75 mph possible

  A tornado or two possible



SUMMARY...Several severe thunderstorms, including a few supercells,

may persist into the evening for a few hours beyond the scheduled

expiration of watch 476, which this replaces.



The severe thunderstorm watch area is approximately along and 60

statute miles east and west of a line from 70 miles north northeast

of Dickinson ND to 55 miles south southwest of Bismarck ND. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU8).



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...This severe thunderstorm watch replaces

severe thunderstorm watch number 476. Watch number 476 will not

be in effect after 645 PM CDT. CONTINUE...WW 477...



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 500. Mean storm motion vector

33020.



...Edwards

