Shallow wind slabs are still lingering close to the ridgelines. Keep your eyes open for drifted, or pillowy looking deposits on E, NE, N or NW aspects if you are in steep, wind affected terrain. Most of the drifts are very shallow and formed Friday night and Saturday morning. Some of these shallow drifts may be camoflaging older, stiffer wind slabs below. Hollow, or drummy feeling or sounding snow is a red flag for wind slab.
Cornices have failed over the last few days as well and there are still some large cornices dotting the ridgelines. Give overhanging cornices a wide berth right now as they will continue to fail as the snowpack warms up again early this week or if you get too close to the edge.
The snowpack is doing a great job refreezing and healing itself right now. The upper portion of the snowpack got saturated and 2 days of cooler weather have allowed the rain soaked portion of the snowpack to refreeze. Some areas have a 2-3 inch crust that is sitting on less consolidated snow below but yesterday our pit tests showed little potential for triggering anything below the crust. Skis are not penetrating this crust and snowmobiles are able to penetrate it in some areas but not in others. If the sun or a combination of sun and warmer temperatures materialize tomorrow, expect the solar aspects to start shedding snow again in the form of small loose/wet avalanches. So far over the last 2 days, the high temps in the mountains did little to soften the crust even in the afternoon.
|0600 temperature:||14 deg. F.|
|Max. temperature in the last 24 hours:||21 deg. F.|
|Average wind direction during the last 24 hours:||WSW|
|Average wind speed during the last 24 hours:||8 mph|
|Maximum wind gust in the last 24 hours:||32 mph|
|New snowfall in the last 24 hours:||NA inches|
|Total snow depth:||63 inches|
SHORT TERM...Today through Monday...Showers associated with an
upper level trough have already moved north out of Nevada and are
affecting areas of the Snake Plain, Mountain Home towards the
Magic Valley at about 3 AM MDT. As the trough swings through the
Intermountain West today, moisture will wrap around the northern
portion of its associated surface low. At this time, models are
still in agreement that a band of moisture will develop, draping
across the Boise Mountains, through Canyon and Ada Counties and
west across the Owyhee Mountains. Snow levels will be near valley
floors and temperatures will be in the low 30s; this will be cold
enough for snow. Snow is expected to be light, generally less
that an inch, with higher amounts expected in the Boise Mountains,
across the Southern Highlands and the Owyhee Mountains, and in
southern Harney County. With a cold pool aloft and an unstable
environment associated with the upper level trough axis, a slight
chance for afternoon thunderstorms cannot be ruled out and remain
in the forecast. Temperatures will be about 10 degrees below
normal today, with a warming trend expected Monday in the trough`s
wake. As the upper level trough slides farther east tonight, a
moist northwest flow will anchor in for the near-term, for light
.LONG TERM...Monday night through Saturday...Persistent northwest
flow will keep a chance of showers across the east- central
Oregon and west-central Idaho mountains though Thursday. An
embedded shortwave will extend the chance of showers into the
southern Idaho mountains on Wednesday. Showers return to the
mountains on Saturday as another weak wave moves into the Pacific
NW. The Snake Plain and southeast Oregon remain dry through the
period. Temperatures are within 5 degrees of normal with Friday
likely being the warmest day.
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.