Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 212023

Area Forecast Discussion
National Weather Service Missoula MT
223 PM MDT Mon Oct 21 2019

.DISCUSSION...The next round of widespread precipitation is moving
into the Idaho Panhandle currently and will spread southeastward
overnight, lasting well into Tuesday morning. One change from
previous events will be rising snow levels to above 7000 feet by
early Tuesday morning, so most road impacts will be limited. An
inch or two of snow is possible for Lolo and Lost Trail passes
this evening before a change over to a rain/snow mix occurs.
Precipitation totals will be impressive in north- central Idaho
with another 0.5-1.5 inches of rain expected.

Breezy southwest-west winds are expected Tuesday afternoon and
evening making for raw conditions when combined with the cool
temperatures and rain showers. Sustained winds near 20 mph with
higher gusts on Flathead Lake will lead to choppy conditions for
those out on the water. Precipitation Tuesday morning will taper
to showers for the afternoon.

Scattered showers will continue Tuesday night across southwest
Montana as snow levels drop to near 4500 feet, thus I-90 east of
Missoula may see minor snow impacts.

Wednesday will usher in slightly cooler temperatures and a few
mountain showers. Through Friday however, there will be a general
drying and warming trend. Each day may start out with a little
fog or low clouds, however, by Friday afternoon it is quite
possible that it will briefly hit 60 in the valleys.

A significant change is coming for Saturday, as a Canadian cold
front will drop into our forecast area. This will usher in much
colder air and by early next week, and lows could be in the teens
across most Western Montanan valleys with single digits in higher
valleys. This will be a fairly dry system, with light rain
showers on Saturday transitioning to light snow overnight. Another
wave of energy is expected for Monday and this will be all snow
as the cold air will be firmly in place. Saturday will also turn
out to be quite breezy in the higher terrain and valleys. Lower
elevation valleys and especially Flathead Lake may experience
breezy conditions prior to frontal passage, but they certainly
will as colder air spills across the Continental Divide Saturday


.AVIATION...The next round of widespread precipitation will overspread
the region this afternoon/evening lasting into Tuesday morning.
Snow levels will rise from 5000 feet this evening to above 7000
feet by early Tuesday. Visibility and ceilings will be reduced at
times for terminal sites with mountain obscurations common. By
Tuesday afternoon, precipitation will diminish and become showery,
focused mostly on the terrain. Winds will also be occasionally
gusty this afternoon and even stronger on Tuesday afternoon with
gusts to 30 kt at terminal sites.



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