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Montana, Judith Basin

Severe Thunderstorm Watch

Statement as of 2:40 PM MDT on June 18, 2013


The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of
west central and northwest Montana

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

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

The Severe Thunderstorm Watch area is approximately along and 90
statute miles east and west of a line from 25 miles north of Cut
Bank Montana to 30 miles south southwest of Helena Montana. For
a complete depiction of the watch see the associated watch
outline update (wous64 kwns wou6).

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 324... ww 325...

Discussion... thunderstorms developing over the mountains of SW Mt
will spread nwd/newd through the evening... with strengthening of the
storms expected as the storms encounter stronger instability away
from the mountains. A few organized storm clusters are
expected... along with a couple of more discrete supercells... with
the risk for large hail and damaging winds through this evening.

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 22025.


... Thompson

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