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URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 641
NWS Storm Prediction Center Norman OK
240 PM MDT Tue Aug 20 2024

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Southwest and Central Montana

* Effective this Tuesday afternoon and evening from 240 PM until
  1000 PM MDT.

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

SUMMARY...Thunderstorms will develop over the mountains of southwest
Montana this afternoon and spread quickly eastward across the watch
area through the evening.  Damaging wind gusts are the main threat
with the strongest storms.

The severe thunderstorm watch area is approximately along and 85
statute miles north and south of a line from 20 miles north of
Dillon MT to 125 miles east northeast of Lewistown MT. For a
co*plete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU1).

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 500. Mean storm motion vector
25030.

...Hart