WWUS20 KWNS 120036
SEL2
SPC WW 120036
NDZ000-SDZ000-120700-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 432
NWS Storm Prediction Center Norman OK
635 PM MDT Tue Aug 11 2020

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Southwestern North Dakota
  Northwestern South Dakota

* Effective this Tuesday night and Wednesday morning from 635 PM
  until 100 AM MDT.

* Primary threats include...
  Scattered damaging wind gusts to 70 mph possible
  Scattered large hail events to 1.5 inches in diameter possible

SUMMARY...Clusters of storms forming in southeastern Montana and
southwestern North Dakota may persist into the overnight hours while
spreading east-southeastward across northwestern South Dakota.  Some
supercell structures will be possible this evening, while upscale
growth into a cluster is expected tonight.  The strongest embedded
storms will be capable of producing damaging winds and large hail.

The severe thunderstorm watch area is approximately along and 45
statute miles north and south of a line from 30 miles northwest of
Buffalo SD to 85 miles east southeast of Lemmon SD. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU2).

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
29020.

...Thompson