Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 251503 AAA
AFDMSO

Area Forecast Discussion...UPDATED
National Weather Service Missoula MT
802 AM MST SUN JAN 25 2015

.UPDATE...Increased fog coverage and issued a dense fog advisory
for the I-90 corridor from Missoula to roughly Bearmouth, as well
as the Missoula valley south to Lolo.

&&

.DISCUSSION...Reports of dense fog have come rolling in this
morning fairly steadily, which prompted to issuance of the dense
fog advisory. It could last through the morning into early
afternoon, if winds or airmass changes do not come. With the ridge
firmly in place over the Northern Rockies, it is likely for dense
fog to reform overnight tonight once again in similar locations.
The forecast has been updated to include more fog coverage for
tonight through Monday morning.

&&

.AVIATION...
Periods of low to mid level cloud ceilings are expected today,
although many areas will still see sunshine from time to time.
Shallow dense fog will be possible in the vicinity of both KGPI
and KMSO this morning. Significantly drier air aloft will move over
the relatively moist low levels tonight leading to fairly widespread
fog development across the valleys. KGPI and KMSO may see dense
fog at times by early Monday morning.



&&

.PREV DISCUSSION... /ISSUED 341 AM MST SUN JAN 25 2015/

DISCUSSION...

Patchy dense fog will be the primary concern this morning,
occasionally leading to reduced visibilities on area roadways.
Otherwise a few light showers will be possible this morning as a
storm system exits the region with a general decreasing trend in
shower coverage throughout the day. Areas of valley fog,
potentially dense at times are expected to return tonight into
Monday morning.

Model guidance remain in agreement that high pressure and warm
air will move into Idaho and Montana tonight. The ridge over the
region will reach a peak on Monday and near record to over record
temperatures will be observed. Hamilton has a high chance to be
one of the warmer spots in the low 60s for Monday. High pressure
will weaken on Tuesday but above average temperatures will remain.

Low pressure currently on the west coast of Baja California will
move northward this week and meet with a shortwave on Wednesday
over Idaho and Montana which will further weaken the ridge and
bring the next chance for precipitation.

High pressure will remain on the west coast for the end of the
week and extended model guidance have backed off on the cold air
that was possible.

AVIATION...
Periods of low to mid level cloud ceilings are expected today,
although many areas will still see sunshine from time to time.
Shallow dense fog will be possible in the vicinity of both KGPI
and KMSO this morning. Significantly drier air aloft will move over
the relatively moist low levels tonight leading to fairly widespread
fog development across the valleys. KGPI and KMSO may see dense
fog at times by early Monday morning.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...DENSE FOG ADVISORY until Noon MST today Missoula/Bitterroot
     Valleys...Potomac/Seeley Lake Region.

ID...None.
&&

$$




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