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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