Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 031008
AFDMSO

Area Forecast Discussion
National Weather Service Missoula MT
408 AM MDT THU SEP 3 2015

...Chilly, wet holiday weekend with high elevation snow expected...

.DISCUSSION...
Narrow cold-frontal rain bands have continued to develop and
train along the very slow-moving cold front this morning, which is
located along a line roughly from Grangeville, ID to Glacier NP.
Snow has already been reported at Glacier NP at 8500 ft since last
night as cold air infiltrates the region. These rain bands will
slowly shift southeastward, bringing precipitation to southwest
Montana and central Idaho later today. Embedded lightning strikes
will be possible with stronger showers later this morning and
afternoon.

Friday through Sunday, precipitation will become more enhanced
and widespread for north-central Idaho and western Montana.
Although the exact locations for best precipitation is still
somewhat uncertain, the Clearwater Range and west-
central/southwest Montana including the Continental Divide should
see the most significant amounts. Snow levels will lower as the
cold air moves across the area Friday, and again late
Saturday/Sunday which will result in higher elevation
snow...especially for Lemhi County, Idaho, southwest Montana, and
Glacier NP. In any case, those planning outdoor activities during
the holiday weekend should expect chilly, wet, and raw conditions
for the terrain.

By Monday, a secondary quick-moving disturbance will bring another
round of scattered precipitation across the area. Beyond this
period, forecast confidence remains low due to inconsistent model
solutions, but there is a trend for drier weather to return
temporarily.

&&

.AVIATION...
A line of rain showers will continue across north-central Idaho
through west-central Montana this morning. Embedded lightning
strikes are possible with stronger showers. In addition, high
elevation snow above 7500-8500ft will be possible. Expect lower
ceilings and visibilities with passing showers. The line of showers
will slowly shift southeastward today, affecting mainly KMSO,
KSMN, KBTM.

&&

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

$$


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