

602 

WWUS20 KWNS 011951

SEL5

SPC WW 011951

SDZ000-020300-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 145

NWS Storm Prediction Center Norman OK

250 PM CDT Fri Jun 1 2018



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  South Dakota



* Effective this Friday afternoon and evening from 250 PM until

  1000 PM CDT.



* Primary threats include...

  Scattered large hail and isolated very large hail events to 2.5

    inches in diameter likely

  Scattered damaging wind gusts to 70 mph possible

  A tornado or two possible



SUMMARY...Thunderstorms will continue to intensify this afternoon

initially across much of west-central/central South Dakota. Some

supercells capable of large hail can be expected, along with some

potential for damaging winds and possibly some tornado risk.



The severe thunderstorm watch area is approximately along and 60

statute miles east and west of a line from 30 miles north northeast

of Mobridge SD to 60 miles south southwest of Chamberlain SD. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU5).



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 143...WW 144...



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

2.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A

few cumulonimbi with maximum tops to 500. Mean storm motion vector

23020.



...Guyer

