Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 181635
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
935 AM MST Sat Nov 18 2017

.DISCUSSION...Dry with just some high clouds and light winds over
the forecast area through today. On Sunday, some isolated fog in
the morning in the mountain valleys, then increasing clouds and
increasing winds ahead of the system that will impact the area on
Monday. Current forecast looks on track and no updates expected.
&&

.AVIATION...VFR. Scattered high level clouds. Surface winds
generally southeasterly 5-10kt. Winds aloft at 10kft MSL: westerly
15-25kt.

Sunday Outlook...VFR with SCT-BKN mid and high level clouds. Patchy
fog in the mountain valleys possible during the early morning.
&&

.PREV DISCUSSION...
SHORT TERM...Today through Sunday...Generally dry conditions
expected today with high pressure present. Patchy fog will be
possible across low-lying areas for this morning, with otherwise
benign conditions. A weak disturbance looks to move through the
area late tonight, but the main impacts look to be brief shift in
winds. Dry conditions will persist through Sunday. Temperatures
expected to be slightly below normal values for today, with a
few degrees of warming expected for Sunday.

LONG TERM...Sunday night through Friday...Clouds will stream into
the region Sunday night ahead of a fast moving upper level trough.
With a west to east trajectory and a deep moisture tap from the
Pacific, precipitation will spread across the region with high QPF
amounts beginning early Monday morning. Due to the westerly flow
aloft, little in the way of shadowing is expected along the Snake
River Plain. This event will begin with snow levels near 4.5-5.5k
feet across Baker to Valley counties, increasing to about 6.5k feet
along the Nevada border. Daytime high temperatures will be within a
few degrees of normal. A moist southwest flow will anchor itself
over the region in the trough`s wake, bringing continued unsettled
weather through the end of the week. A warm front will pass through
the region Wednesday for the next round of increased precipitation.
By this time, even the highest peaks will receive rain as snow
levels will have increased to about 10k feet. Daytime highs will
have warmed to about 10 degrees above normal. By Thursday morning,
the front will have moved north and drier, warmer conditions will
briefly set in. The next round of moisture and decreasing
temperatures will accompany the next system, due to pass through the
region at the end of the week.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.
OR...None.

&&

$$

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DISCUSSION...TB
AVIATION.....KA
PREV SHORT TERM...KB
PREV LONG TERM....AB



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