Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 190916

Area Forecast Discussion
National Weather Service Missoula MT
316 AM MDT Fri Oct 19 2018

.DISCUSSION...Temperatures overnight are running a few degrees
warmer than 24 hours ago, due to cloud cover. Fog has been slow
to form; patchy fog is still expected this morning but with less
coverage than yesterday morning. High pressure maintains for the
weekend, so cold mornings and warm afternoons are expected.
Stagnant air is beginning to increase particulate levels in the
most stable valleys of the region, and stable conditions will
remain through at least the weekend.

With warm and dry conditions expected through Wednesday of next
week, the next chance for precipitation is still anticipated to
occur next Thursday into Friday. Moisture will move in from the
Pacific Northwest, accompanied by strong upper level westerly
flow, which should keep things warm enough to produce mostly rain
across central Idaho into western Montana. Whether or not the
valleys of western Montana will be shadowed out of receiving any
appreciable rain is yet to be seen, but the wind profile
certainly supports a downsloping effect scenario next Thursday.
Regardless of the details, the weather pattern for late next week
certainly looks much more seasonal for this time of year than as
of late.


.AVIATION...High cloud cover is preventing temperatures from
cooling as quickly as previous nights, and as such, fog has been
slow to form. Patchy fog remains possible with many sites showing
low dewpoint depressions. Once fog dissipates by mid-morning,
generally light winds and warm temperatures are expected for the
rest of the day.



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