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Avalanche Forecast

Archived

Feb 22nd, 2015–Feb 23rd, 2015

Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Mt Hood.

A low avalanche danger is expected in all three elevation bands at Mt Hood on Monday, but we aware of small loose wet avalanches in isolated terrain.

Detailed Forecast

Generally light winds and warmer temperatures are expected Monday as freezing levels rise to 8000-9000 feet. 

As a result, small loose wet avalanches are possible in isolated terrain Monday, generally steeper solar slopes near and above treeline in the late morning or early afternoon hours.

Also, give cornices above treeline, even if small relative to this time of year, a wide berth with the warming temperatures Monday. 

Due to the low snowpack, especially below treeline, watch for terrain hazards such as open creeks, partially covered rocks and vegetation. Many areas below treeline do not have enough snow (new or existing) to pose an avalanche hazard. 

Snowpack Discussion

Since the wet start to February, fair weather through mid-February has lead to generally thick surface crusts and further consolidation of the snowpack, as well as further deterioration of the snow cover below treeline.

A few weather disturbances passed through in NW flow aloft the latter half of the week, bringing an inch or two of new snow near and above treeline for Mt. Hood. 

On Saturday, NWAC observer C.J. Svela was on the south side of Mt. Hood traveling in the near and above tree-line zones out of Timberline. He found overall low avalanche hazard, a firm surface on the upper mountain, and the solar effects limited by moderate NE winds. Check out his photos on Instagram.  

Mt. Hood Meadows reported early Sunday morning that although E-NE winds were strong, there was minimal snow available for transport even on the upper mountain. 

The mid and lower snowpack at Mt Hood snow consists of layers of stable consolidated rounded grains or melt forms and crusts from multiple warm periods this winter.

Problems

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.