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Area forecast discussion 
National Weather Service Missoula Montana
400 am MST Sat Nov 28 2015

Discussion...fog and low stratus clouds will continue to plague
many of the valleys across western Montana and central Idaho over
the next several days. In fact, further coverage expansion of the
fog/stratus are expected today and especially Sunday as the flow
aloft decreases with time. We do expect that, much like Kalispell,
once freezing fog/low stratus clouds takes hold in Missoula it will
likely not dissipate completely until midweek.

Between today and Tuesday those areas where fog and/or stratus do
not lift/dissipate will experience very little difference between
daytime high temperatures and overnight lows. Meanwhile, other
areas which do not develop or keep persistent fog/stratus will see
continued very cold nights followed by some warming during the
afternoon. Pleasantly warm temperatures and clear skies are to be
expected above the valley inversions.

There is potential for a few weak disturbances to start breaking
through the ridge mid to late week which could bring light
precipitation to the region. Valley cold pools will still be slow
to erode this week, however, which may lead to frozen/freezing
precipitation concerns. Gradually toward the end of the week,
stronger southwest flow will be helpful in modifying valley cold
pools and warming the higher terrain. Long-range models suggest a
better chance for precipitation by this period and again early
next week, though uncertainty still exists at this time.


Aviation...a persistent low stratus deck will remain fixed in
place at kgpi into the foreseeable future. At kmso thicker, more
persistent fog and/or stratus are expected this morning but
should show some improvement by about midday. However visibility
reductions and lowering ceilings are expected to return yet again
tonight and likely persist through much of Sunday morning. Kbtm will
continue to battle drifting fog and stratus this morning with
conditions improving later this morning. And at ksmn some fog is
expected to develop this morning, but without long lasting impact
towards aviation interests.


Mso watches/warnings/advisories...


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