

939 

WWUS20 KWNS 232259

SEL8

SPC WW 232259

NDZ000-SDZ000-240600-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 348

NWS Storm Prediction Center Norman OK

600 PM CDT Thu Aug 23 2018



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Southeastern North Dakota

  Northeastern South Dakota



* Effective this Thursday night and Friday morning from 600 PM

  until 100 AM CDT.



* Primary threats include...

  Scattered large hail events to 1.5 inches in diameter possible

  Isolated damaging wind gusts to 70 mph possible



SUMMARY...Ongoing/early-stage strong-severe thunderstorms are

expected to shift northeastward across portions of the watch area,

offering damaging gusts and large hail in a favorably moist and

unstable environment.  Additional development is expected through

this evening on either side of the ND/SD state line, mainly with a

large-hail risk.



The severe thunderstorm watch area is approximately along and 60

statute miles north and south of a line from 90 miles west of

Aberdeen SD to 60 miles north northeast of Watertown SD. 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.



&&



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

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

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

24025.



...Edwards

