

526 

WWUS20 KWNS 272329

SEL0

SPC WW 272329

MTZ000-NDZ000-SDZ000-WYZ000-280700-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 460

NWS Storm Prediction Center Norman OK

530 PM MDT Thu Aug 27 2020



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Southeast Montana

  Southwest North Dakota

  Western and Central South Dakota

  Northeast Wyoming



* Effective this Thursday afternoon and Friday morning from 530

  PM until 100 AM MDT.



* Primary threats include...

  Scattered damaging winds likely with isolated significant gusts

    to 80 mph possible

  Scattered large hail likely with isolated very large hail events

    to 3 inches in diameter possible

  A tornado or two possible



SUMMARY...Initially isolated severe thunderstorms including

supercells are expected to further develop and increase across the

region this evening. By late evening, one or more

eastward-accelerating clusters should evolve with an increasing wind

damage risk across South Dakota/southern North Dakota.



The severe thunderstorm watch area is approximately along and 120

statute miles east and west of a line from 45 miles north northeast

of Baker MT to 80 miles south southeast of Rapid City SD. 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 456...WW 457...WW

458...WW 459...



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

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

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

28020.



...Guyer

