Bollettino valanghe

Mt Hood

Northwest Avalanche Center
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Pericolo valanghe

Tue
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
2 · Moderato
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In sintesi

730AM Update: Avalanche danger lowered with less precipitation than forecast overnight.  Low likelihood/high consequence wet snow avalanche are still possible, limit your exposure to large avalanche paths on the upper mountain.  Strong afternoon winds will form new wind slabs at middle and upper elevations. 

Problemi valanghivi

  • Wet Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    3

    Limit your exposure to areas where very large avalanches can start, stop and run.  4-5" of largely liquid water has entered the snowpack below 8000', with the precipitation tailing off Sunday evening. 

    Wet slabs are highly unpredictable, failing as water runs through the snowpack and pools on crusts or weak layers in the snowpack. A very large wet slab avalanche would be unsurvivable. These may initiate in middle or upper elevation start zones and could run to valley flats and down canyon drainages.  While the likelihood of natural avalanches should tick down a notch Monday,  your best bet is to avoid all terrain connected to upper elevation start zones.

    Natural wet loose avalanche activity may have peaked already at lower elevations, however, a soggy, wet snowpack still requires your respect.  Steer around very steep slopes with deep wet snow, and use extra care around terrain traps.  Around the rain/snow line, you may see a higher likelihood of wet loose avalanches as the snow level bumps around. Cornices are likely to be weakened and may fail naturally.  Don't travel on or below slopes with large overhanging cornices. 

    Example: A very large D3 avalanche in Heather Canyon. running down to and along the canyon bottom.

    Photo: Joe Dellaporta

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–2

    Bouts of strong W-SW winds will load lee slopes at upper and mid elevations as the snow level dip this afternoon and precipitation increases.   If you find cracking in the freshly drifted snow, avoid nearby steep slopes.  New wind slabs could grow to be large as winds and snow increase later today and tonight. 

    (2/1/2025)

    Look for cracking in the snow as a sign you may trigger a wind slab avalanche on nearby slopes. 

    Photo: Joe Dellaporta

Avalanche Discussion

It's wet and windy!  Over 4" of mostly liquid water has entered the snowpack below 7000-8000' since Saturday afternoon.  Due to the storm, observations outside of weather stations are extremely limited.  At mid-elevations,  Mt Hood pro-patrol reported wet, saturated snow extended down at least 2' from the surface Sunday morning.  

The last significant snow event brought 6-10" of snow accompanied by strong W-NW winds, producing some impressive wind slab activity. A very large natural avalanche failed on an E aspect in White River Drainage. Multiple size 2-2.5 (large) avalanches were triggered by MHM patrol on E and SE aspects, including this one. This activity likely involved the 2/13 interface, which may wake back up over this storm cycle.

In the gallery, we're including a variety of the types of wet avalanche activity that may have happened over the weekend. A crown profile from a recent large wind slab also shows the potential for structural weaknesses in the snowpack that can be exploited by rainwater moving through the snowpack and triggering wet slabs.

You can contribute to the avalanche forecast! Let us know what you see by submitting a public observation here. 

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