

174 

WWUS20 KWNS 032340

SEL0

SPC WW 032340

SDZ000-040600-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 260

NWS Storm Prediction Center Norman OK

640 PM CDT Tue Jul 3 2018



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Northeastern South Dakota



* Effective this Tuesday night and Wednesday morning from 640 PM

  until 100 AM CDT.



* Primary threats include...

  Scattered large hail and isolated very large hail events to 2

    inches in diameter possible

  Scattered damaging wind gusts to 70 mph possible



SUMMARY...Thunderstorm development is underway between Aberdeen and

Pierre, and the storms should intensify/persist into this evening.

The storm environment will support a mix of supercells and multicell

clusters capable of producing large hail and damaging winds.  The

storms will likely be slow moving, with a tendency for back-building

toward the southwest.



The severe thunderstorm watch area is approximately along and 40

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

of Aberdeen SD to 55 miles east of Aberdeen 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 259...



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 600. Mean storm motion vector

26010.



...Thompson

