Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 202139

Area Forecast Discussion
National Weather Service Missoula MT
239 PM MST Wed Feb 20 2019

.DISCUSSION...Snow showers will continue in north-central Idaho
through tonight, but widespread moderate to heavy snow intensity
is no longer expected, so Winter Storm Warnings have been
downgraded to Winter Weather Advisories. Temperatures are warming
with many spots in western Montana seeing sunshine, but cold air
is set to move west of the Divide during this evening. Locations
along the Divide are expected to see snow showers during the
afternoon, followed by gusty winds, blowing snow, and very cold
wind chills for the overnight and during Thursday morning. Winter
Weather Advisories have been issued for those with the highest
chances of seeing additional snow, wind, and cold wind chills. It
is possible that the Highway 93 corridor will see periods of snow
during the evening with isolated snow accumulations. Increased
winds tonight and Thursday morning may also produce isolated
impacts from blowing snow in the Flathead/Mission/Missoula

Snow generally tapers off during Thursday; although, conditions
look favorable for lake effect snow on Flathead Lake Thursday

Friday morning will be another cold one for those with clear

Another active period of unseasonably cold and snowy weather is
anticipated to begin late Friday through early next week. Light
snow will develop in NW Montana on Friday and gradually spread
across most of the region Friday night and continue on Saturday
with minor road impacts.

The next surge of arctic air is set to come over the Divide
Saturday night into Sunday morning along with another round of
light snow. Wind gust of 35-45 mph will create blowing snow and
wind chill issues in the favored areas such as Badrock Canyon, the
northern Flathead Valley, and further south around Helmville,
Garrison Jct westward to Hellgate Canyon. Travelers should plan
for periods of changeable, slick roadways and difficult travel.
Those expecting newborn livestock will continue to experience
problematic times.

The general pattern thereafter remains favored for more snow and
additional cold temperatures as arctic air ebbs and flows over
the Divide while interacting with moisture streaming off the
Pacific. Expect at least periods of light to moderate snow
accumulations for all elevations. Some forecast models favor a
period or two of heavy snow early next week but differ
considerably on timing and location but the general focus appears
to be from I-90 southward. Stay tuned as this could be a major
snow event for valleys and mountains, if it comes together.


.AVIATION...Snow, causing lowered ceilings and visibility continue
in north-central Idaho and are expected to remain for much of the
night. The next push of cold air is poised to move west across the
Divide during this evening. Obscured terrain and at least a period
of light snow is expected with the front. Easterly winds will
develop during the evening with 25 to 35 knot winds overnight.
Winds and light snow will linger through Thursday morning.


MT...Winter Weather Advisory until 8 AM MST Thursday Butte/Blackfoot
     Region...Potomac/Seeley Lake Region...West Glacier Region.

ID...Winter Weather Advisory until 7 AM PST Thursday Lower Hells
     Canyon/Salmon River Region.

     Winter Weather Advisory until 7 AM PST Thursday
     Orofino/Grangeville Region.


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