Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 252128
AFDMSO

Area Forecast Discussion
National Weather Service Missoula MT
226 PM MST SUN JAN 25 2015

...STAGNANT HIGH PRESSURE PATTERN TO BRING WARMER TEMPS, AIR
QUALITY ISSUES, PERSISTENT FOG...

.DISCUSSION...A massive ridge of high pressure is locked over the
western United States, and doesn`t look like it will shift enough
to allow for much change to the ongoing forecast for the next
several days. Impacts during this time will most likely be
persistent fog in locations like the I-90 corridor in western
Montana, specifically around the Missoula and south to
Stevensville. Similar to today, fog is likely to redevelop
overnight tonight and impact these areas once again Monday. In
other places, such as northwest Montana, lingering low stratus
could persist instead of fog. Many other locations across western
Montana and central Idaho could even see a mix of both.

Needless to say, not much will change in the coming
days...especially temperatures. With inversions strengthening,
upper elevations will be warming quite a bit. Some valleys will be
warming if winds are able to mix them out, causing temperatures to
rise into the 50s and even low 60s. Valleys stuck in inversions
should expect less of a warm-up, with temps in the 30s and 40s.

A low pressure system currently located along the western coast of
Baja California is forecast to shift northward and intersect a
weak shortwave trough over our region by Tuesday night/Wednesday.
The impact from this system will be minor, but it could bring some
light precipitation across the area during the mid-week. Behind
this weak system, a dry period will return for the rest of the
week into the weekend as the ridge rebuilds.

&&

.AVIATION...
Scattered mid to high clouds remain over the region today,
becoming partly cloudy to mostly clear overnight. Fairly
widespread fog development will be possible for the valleys,
especially for KMSO and KGPI after midnight. KSMN could also see
patchy dense fog in the vicinity overnight. Areas of fog that
develop are likely to remain for KGPI and KMSO through late Monday
morning.

&&

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

$$




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