Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 180923

Area Forecast Discussion
National Weather Service Boise ID
323 AM MDT Sun Mar 18 2018

.SHORT TERM...Today through Monday...Upper trough situated over
the area this morning continues to support snow showers, mainly in
the Boise/West Central Mountains where a Winter Weather Advisory
is in effect until noon. Additional accumulations of 1 to 3
inches are expected, putting storm total amounts of around a foot
in McCall. Scattered showers will continue across the remainder of
southwest Idaho with little additional accumulation. The Winter
Weather Advisory for the Southwest Highlands and Owyhees has been
cancelled. A weak upper ridge with drier conditions in southeast
Oregon will move into southwest Idaho this evening. Snow showers
may linger in the west central Idaho mountains but little
additional accumulation is expected. Limited moisture within a
northwest flow aloft will be enough for a chance of snow showers
over the higher terrain Monday afternoon, mainly in the north. The
departing trough and weak ridging will result in a warming trend
through Monday, although temperatures will remain slightly below

.LONG TERM...Monday night through Sunday...Our unsettled pattern
continues in the extended model runs. A weak upper level trough
pushes through our northern most zones Tuesday with a much deeper
and more potent low impacting us mid-week. Moist southwesterly
flow out ahead of the main trough axis will begin impacting us
late Tuesday into Wednesday with widespread precipitation. Snow
levels still climb up near 7000 feet MSL leaving snowfall to the
highest elevations. As the main trough axis pushes through Friday,
snow levels plummet down to valley floors. Model agreement after
Friday continues to lack consistency between runs leaving low
confidence in the forecast for the start of the weekend.


.AVIATION...Mostly VFR. Showers continue through mid-morning on
the Idaho side with persistent snow showers at KMYL causing
MVFR/IFR conditions. Isolated showers during the afternoon hours,
mostly in the higher elevations near the ID/NV border and central
Idaho mountains. Surface winds, westerly 5-10kts except from KMUO
southeastward with winds 15-20kts with afternoon gusts 20-25kts.
Winds aloft to 10k feet MSL, westerly 10-20kts.


ID...Winter Weather Advisory until noon MDT today IDZ011-013.



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