935 
FXUS65 KMSO 170957
AFDMSO

Area Forecast Discussion
National Weather Service Missoula MT
357 AM MDT Wed Jul 17 2019

.DISCUSSION...An upper level disturbance will bring an increase 
of cloud cover and chances for showers across northwest Montana 
this afternoon and evening. A westerly jet stream will nudge 
across the Northern Rockies this afternoon with blustery westerly 
winds developing for the afternoon and evening hours. Winds will 
further increase during the day Thursday, with the strongest winds
expected over northwest Montana, especially near the Continental 
Divide, where wind gusts up to 50 mph will be possible across 
mountain passes in Glacier National Park. Those planning to 
recreate on area lakes should be prepared for choppy conditions, 
especially during the day Thursday. 

A relatively cool trough of low pressure will drop southward out 
of British Columbia and Alberta into northwest Montana Friday. 
Little to no precipitation is expected with this system. As this 
system exits the area Friday night, cool overnight temperatures 
are expected with higher mountain valleys potentially seeing local
areas of frost. 

Model guidance continues to come into better agreement with the 
depiction of a large area of high pressure amplifying across the 
western U.S. this weekend into early next week. The warmest 
temperatures of the summer could take place early next week, as 
highs across western Montana valleys soar into the mid 90s and 
lower elevations of north central Idaho reach the century mark.

&&

.AVIATION...

Patchy valley fog this morning across northwest Montana, including
terminal KGPI, will give way to ceilings mostly above terrain
features across most of the Northern Rockies through 18/0000Z. 
Very low ceilings and visibility due to fog at KGPI will exist 
through 17/1400Z. After 17/1800Z winds will intensify across the 
Northern Rockies, with gusts to 25 knots possible at all major 
terminals, including KMSO, KGPI, KBTM, KSMN. Winds will subside 
after 18/0200Z. Rain showers will spread across northwest and west
central Montana beginning 17/2100Z, which may bring down ceilings
to below mountain top elevation near KGPI and KMSO.

&&

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

$$