Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 172032

Area Forecast Discussion
National Weather Service Missoula MT
232 PM MDT Sat Mar 17 2018

.DISCUSSION...A mid level low pressure systems continues to
strengthen over central Idaho this afternoon, pulling moisture
north through portions of the Northern Rockies. The snow that fell
across north-central Idaho today, has largely melted on area
roads. However, overnight tonight, the low will continue to gain
strength aiding in further enhancement of snow. We still expect
portions of north-central Idaho, including the Camas Prairie, to
receive several inches overnight. A narrow band of enhanced
precipitation is also forecast to develop after sunset tonight and
move over west-central and southwestern Montana. That will bring
accumulating snow to the mountains and valleys, where a few inches
of snow are expected by morning. Area advisories remain in place
through the night, and can be found by visiting, for further details.

Scattered snow showers will remain in the forecast for all of the
Northern Rockies during the day tomorrow, with the development of
a northwesterly flow pattern interacting with moisture wrapping
around the departing low to the east. Only a trace to 1 inch of
snow is expected, and should melt soon after each shower passes.

Spring like weather is expected on Monday into Tuesday, with
primarily mountain showers continuing, especially across northwest
Montana and through the Clearwater Mountains of Idaho. High
pressure begins to nudge into the region Tuesday into Wednesday,
which should bring a brief trend towards drying and warming.

A change begins for Thursday as an approaching cold front begins
to spread showers into the region. Initially, warm conditions will
keep snow levels pretty high (around 5000-6000 feet). However,
this will change as the cold front moves through sometime Thursday
evening into Friday morning. Unsettled and cooler conditions then
linger for Friday into the weekend.


.AVIATION...A mid level low pressure system over central Idaho
will continue to spread moisture north through much of the
Northern Rockies. KMSO, KBTM, and KSMN can expect periods of
light to moderate snow overnight, after 18/0300Z. Low visibility,
low ceilings, along with 1 to 3 inches are expected to impact
these terminals. Snow will quickly melt after sunrise tomorrow.
The Northern Rockies will continue to see lingering snow showers
throughout the day tomorrow. Though, little accumulation is


MT...Winter Weather Advisory until noon MDT Sunday
     Bitterroot/Sapphire Mountains...Butte/Blackfoot Region.

     Winter Weather Advisory from 9 PM this evening to noon MDT
     Sunday Missoula/Bitterroot Valleys.

ID...Winter Weather Advisory until 11 AM PDT Sunday ABOVE 3000 FEET
     for the Lower Hells Canyon/Salmon River Region...Northern
     Clearwater Mountains...Orofino/Grangeville Region...
     Southern Clearwater Mountains.

     Winter Weather Advisory until 6 AM MDT Sunday Eastern Lemhi
     County...Western Lemhi County.


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