Special Weather Statement, NWS Missoula, MT

Area Forecast Discussion
National Weather Service Missoula MT
211 PM MDT Sun Jun 4 2017

.DISCUSSION...An approaching cold front, presently over Oregon
and Washington, will slowly approach the Northern Rockies through
this evening. As it does, increasing wind shear will interact with
an atmosphere that continues to moisten and grow unstable this
afternoon, something that is already apparent by the ongoing
thunderstorm activity across Lemhi County and much of SW Montana.
As the atmosphere grows increasingly favorable for thunderstorms,
so too will the potential for severe thunderstorms with the chief
threats being wind gusts in excess of 50 mph and hail around 1
inch in diameter. These storms will continue to affect the area
through this evening with the threat for strong/severe storms
persisting until around 10pm. Thereafter rain showers are likely
to linger overnight with some locations seeing some moderate
precipitation under the stronger convective precipitation cores.

Monday will be a pleasant early June day with temperatures running
near normal and the atmosphere showing continued signs of drying.
The exception to this will be in NW Montana and along the
Continental Divide where wrap around moisture will keep scattered
showers and cloudiness present throughout the day. Monday will
also start a warming and drying trend to last through mid week.
By Wednesday temperatures will be 15 to 20 degrees above average
with highs in the upper 80s to low 90s. Thursday will be another
hot day, with an increasing chance of thunderstorms ahead of the
next cold front.

Friday will mark the passage of a cold front with active, wet
weather including thunderstorms. By Saturday and Sunday, afternoon
temperatures will be in the upper 50s and 60s.&&

.AVIATION...A strong cold front is moving across the northern
Rockies today causing thunderstorms. Mainly showers and isolated
thunderstorms are expected behind the front and to affect terminal
KGPI. Further south and east affecting terminals KMSO, KBTM, and
KSMN some storms may be severe this afternoon and evening. Winds
over 50 knots are the most likely impact from strong
thunderstorms, and terminal KMSO is most likely to be affected
followed by KBTM. There is also a chance of some large hail over 1
inch in size with these storms. Expect storms to move east of the
Continental Divide around 06Z.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...None.
ID...None.
&&

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Special Weather Statement
National Weather Service Missoula MT
424 PM MDT SUN JUN 4 2017

MTZ007-042300-
Butte/Blackfoot Region MT-
424 PM MDT SUN JUN 4 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL POWELL COUNTY UNTIL
500 PM MDT...

At 423 PM MDT, Doppler radar was tracking a strong thunderstorm near
Garrison, or 12 miles east of Drummond, moving northeast at 30 mph.

Pea size hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Garrison, Jens, Brock Creek and Goldcreek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4647 11293 4651 11303 4676 11297 4667 11264
TIME...MOT...LOC 2223Z 202DEG 25KT 4660 11290

Special Weather Statement
National Weather Service Missoula MT
425 PM MDT SUN JUN 4 2017

MTZ007-042300-
Butte/Blackfoot Region MT-
425 PM MDT SUN JUN 4 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN GRANITE AND
SOUTHWESTERN POWELL COUNTIES UNTIL 500 PM MDT...

At 425 PM MDT, Doppler radar was tracking a strong thunderstorm near
Drummond, moving north at 15 mph.

Pea size hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Drummond, New Chicago and Hall.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4650 11304 4652 11322 4679 11323 4677 11298
TIME...MOT...LOC 2225Z 185DEG 14KT 4660 11311