Monday and Tuesday the West Central Mountains got hammered by some pretty gusty winds around 30 MPH that transported snow and created drifts and wind slabs in upper elevation terrain. Some of the surfaces that the newer snow was deposited onto were slick rain crusts, and or Sun crusts, and are going to take some time to bond. Be on the lookout for signs of wind slab formation like etching in the snow surface, drifts, pillows, and hollow sounding snow, or shooting cracks.
Upper elevations have picked up around 12 inches in the last 72 hours that may take some time to bond to the Sun and rain crusts that have formed. Loose dry avalanches up to a foot deep are possible on steep slopes.
Granite MTN Weather Station 7700 FT
PAC will issue 3 Advisories per week through April 5.
Your Observations are extremely helpful and appreciated by all backcountry users. If you have not checked our our Observations page, it is really easy to add snow or avalanche info. Drop down menus and prompts will lead you through it and it is easy to add photos.
Please be aware that there are areas that are CLOSED to motorized traffic in the McCall, Goose Lake and greater West Mountains area. Just because there are tracks in some areas, does not mean they are open. Please respect all users and closures. See the Payette Winter Travel Maps for clarification. Both the East and West maps can be downloaded on the Avenza app on your phone or are available at trailheads and local shops. IT IS YOUR RESPONSIBILITY TO KNOW WHERE YOU ARE AND WHERE THESE CLOSURES EXIST.
|0600 temperature:||21 deg. F.|
|Max. temperature in the last 24 hours:||29 deg. F.|
|Average wind direction during the last 24 hours:||E|
|Average wind speed during the last 24 hours:||3 mph|
|Maximum wind gust in the last 24 hours:||13 mph|
|New snowfall in the last 24 hours:||NA inches|
|Total snow depth:||NA inches|
Area Forecast Discussion
National Weather Service Boise ID
316 AM MDT Fri Mar 29 2019
.SHORT TERM...Today through Sunday...A slow-moving upper low will
continue across the region today. There will be enough breaks in
the clouds for patchy fog this morning in the northern valleys,
including McCall. Showers associated with the low will be
isolated this morning, but the coverage will increase during the
afternoon. There will be some support for isolated afternoon
thunderstorms as well. The convection will be generally limited to
the higher elevations with little or no activity expected in the
Treasure/Western Magic Valleys. Snow levels will remain around
5000 feet with light snow accumulations possible in the mountains.
The showers will diminish this evening as the low weakens and due
to loss of daytime heating. Another weaker upper low will move
into the northern Rockies and extend into our area on Saturday.
The shower coverage is expected to be much lower, mainly over the
higher terrain of southwest Idaho during the afternoon. The low
will also weaken and be replaced with drier northwest flow aloft
on Sunday. Temperatures will be a few degrees below normal today,
near normal on Saturday, and a few degrees above normal on Sunday.
Winds will be generally light through Saturday, with the
exception of locally breezy winds east of Mountain Home this
.LONG TERM...Sunday night through Thursday...Weak ridging aloft
brings a brief period of drier conditions into Monday.
Precipitation ahead of the next storm system will spread into
southeast Oregon by Monday afternoon and southwest Idaho by
Tuesday morning. This is a dynamic and moist system with
precipitable water values in the 90th percentile. Mild southwest
flow ahead of the system will raise snow levels to 6500-7500 feet
Monday night into Tuesday. The potential for moderate rainfall on
the remaining mid-elevation snowpack will warrant monitoring for
hydrologic impacts through midweek. Snow levels drop to 4500-5500
feet Tuesday night into Wednesday as the upper low crosses the
region. Conditions remain unsettled into Thursday under a
progressive westerly flow aloft. Temperatures are near normal
.AVIATION...Mountains will see local MVFR and terrain obscuration
in rain/snow showers today with VFR in lower valleys. Isolated
thunderstorms this afternoon across southeast Oregon and in
vicinity of ID/NV border will bring potential for small hail and
gusty winds. Will see VFR conditions most areas after 30/03Z,
exception being local IFR in mountain valley fog. Surface winds to
15 kts with higher gusts in Snake Plain and ID/NV border region.
Winds aloft to 10k feet MSL: north-northwest 15-25 kts becoming 15
kts or less after 30/06Z
This avalanche advisory is provided through a partnership between the Payette National Forest and the Payette Avalanche Center. This advisory covers the West Central Mountains between Hard Butte on the north and Council Mountain on the south. This advisory applies only to backcountry areas outside established ski area boundaries. This advisory describes general avalanche conditions and local variations always occur. This advisory expires at midnight on the posted day unless otherwise noted. The information in this advisory is provided by the USDA Forest Service who is solely responsible for its content.