Special Weather Statement, NWS Missoula, MT

Area Forecast Discussion
National Weather Service Missoula MT
220 PM MDT Thu Aug 18 2016

.DISCUSSION...High pressure continues to build east of the
Continental Divide setting up a surge of cold air to move across
western Montana this evening. Wind advisories have been issued
for several locations in northwest Montana due to the winds.

The most notable highlight is a High Wind Warning for Flathead
Lake and the surrounding area. Models indicate the strongest winds
will be this evening and will be strongest over the lake. Winds
30-40 mph with gusts near 50 mph are expected tonight. Considering
the warm lake water, cool air mass, strong winds, and long north-
south fetch across the lake, there is potential for waves over 5
feet on the southwestern shores of Flathead Lake tonight. With the
lake at full pool and the recreation season in full swing, the
area is at its most vulnerable for a high wind event, hence the
warning. Generally in Idaho winds will be much lighter and out of
the north, just bringing a bit of a cool down for central Idaho.

There is also a chance of thunderstorms this evening. Butte is
the most likely area to be affected by thunderstorms, but there is
also a slight chance a thunderstorm could also affect the Mission
valley.

Friday cool and stable conditions will cause skies to clear out
quickly for a nice, but cooler day with temperatures in the 70s in
western Montana and 80s in central Idaho.

A building high pressure ridge will lead to warm and dry weather
for the coming weekend with daytime highs returning to a few
degrees above normal by Sunday.

Beginning late Sunday into Monday, a low pressure trough will
settle into British Columbia and breakdown the high pressure
ridge. A cold front passage on Monday will lead to gusty westerly
winds with little, if any precipitation for the Northern Rockies.
It will also be cooler with temperatures at more seasonable levels
early next week.

&&

.AVIATION...A back-door cold front coming across the Continental
Divide will cause strong north and east winds at area terminals
KGPI and KMSO. Otherwise, expect isolated thunderstorms, mainly
along the Continental Divide with KBTM being the most likely to be
impacted around 00Z.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...Wind Advisory until 6 AM MDT Friday Missoula/Bitterroot Valleys.

     High Wind Warning until 6 AM MDT Friday Flathead/Mission Valleys.

     Wind Advisory until 6 AM MDT Friday West Glacier Region.

     Wind Advisory until 6 AM MDT Friday Kootenai/Cabinet Region.

ID...&&

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