Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 020954
AFDMSO

Area Forecast Discussion
National Weather Service Missoula MT
353 AM MDT TUE SEP 2 2014

.DISCUSSION...

High pressure will continue to be present over the Northern
Rockies through today. Daytime temperatures will be pleasant
during this time, however slightly below the seasonal average.
Clouds and winds will be on the increase this afternoon as well.

Another relatively cold storm system will impact the Northern
Rockies Tuesday evening through Wednesday, bringing widespread
rain to mainly northwest Montana and cooling temperatures once
again across the entire region. Snow levels are anticipated to
drop to 6500 feet Wednesday night, allowing rain over Glacier Park
to briefly change over to snow during this time. Despite minimal
snow accumulations forecast, cold rain will present a hypothermia
risk for those recreating at high elevations and in the back
country.

Thursday through midday Monday, high pressure will return to the
Northern Rockies. Dry and steadily warming conditions are expected
during this time. Morning temperatures will be plenty cold to
support frost in high elevation valleys both Thursday and Friday
mornings. Sensitive plants and vegetable gardens are likely to be
damaged by near-freezing temperatures.

Global models continue to depict an additional cold storm system
moving across the Northern Rockies beginning midday Monday through
Wednesday next week. The recent and continuing cool pattern over
the region shows little sign of ending. Model ensemble solutions
continue to coalesce around a persistent ridge of high pressure
south of the Gulf of Alaska, thus maintaining a northwesterly
oriented storm track over the Northern Rockies. Bottom line: Fall
is here.

&&

.AVIATION...Mid to high level clouds will continue to stream
across northwest Montana. Gusty westerly winds are expected
redevelop this afternoon/evening for KMSO, KGPI and KBTM as the
atmosphere destabilizes. Tonight, a cold front will swing into the
Northern Rockies which will cause breezy conditions by Wednesday.
The precipitation appears to remain north of the I-90 corridor,
mainly impacting KGPI.

&&

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

Zumpfe
Aviation...Smith

$$




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