Bollettino valanghe

Mt Hood

Northwest Avalanche Center
Vedi sulla mappa

Pericolo valanghe

Tue
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
3 · Marcato
Open full map
Non aggiornato — questo bollettino è scaduto 4 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

New snow and wind will create dangerous avalanche conditions on Monday. As new snow piles up, consider any slope greater than 35 degrees as suspect. Stick to simple terrain and reduce your exposure to avalanche-prone slopes. 

Problemi valanghivi

  • Wind Slabs

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

    West winds will be at work drifting new snow into reactive drifts at mid and upper elevations. These slabs will build in size and distribution across the terrain as new snow piles up. By later day, these wind-drifted slabs could be large enough to bury you. 

    Use visual clues such as blowing snow and fresh drifts to help you identify slopes of concern. Look for these pillow-like slabs to be forming on the leeward side of ridges and canyon walls, under cornices, and peppered in the alpine. High wind speeds may push these slabs further down slope than usual, so dont be surpsied if you find reactive drifts at lower elevations or mid-slope. 

     

    (1/17/2023)

    Shooting cracks - a red flag that should not be ignored.  Avoid wind loaded slopes if you notice signs like this. 

    Photo: Joe Dellaporta

  • Storm Slabs

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

    We’ll be getting enough snow that any steep terrain should be considered suspect. Some of these steep slopes may even avalanche naturally. The best policy is to simply limit your exposure to slopes greater than 35 degrees.  Don’t ignore obvious signs of instability such as shooting cracks under your skis/sled, hard over soft layering, or snow sliding easily on test slopes. These are in-your-face signs telling you to move to lower-angle terrain. 

    (12/20/2022)

    An example of a small storm slab. 

    Photo: Public Observation

Avalanche Discussion

Monday is shaping up to be a stormy day for the Mt Hood zone. We’re expecting significant precipitation accompanied by strong to extreme wind speeds. As the day progresses expect rising avalanche danger. By the later afternoon hours, we may be flirting with high avalanche danger at upper elevations, which means natural avalanches are likely. So with that, be ready to take a big step back with your travel objectives on Monday. It will be best to keep it simple and let the storm run its course. 

Sunday warmed up! The Cascade Express weather station at 7300’ recorded a high temperature of 46 degrees. Additionally, the Mt Hood Meadows Pro Patrol reported widespread moist surfaces. Meaning even northerly aspects got warm and now have wet snow at the surface. New snow should bond well with these moist surfaces, but you’ll still want to check how the new snow is bonding as you travel. 

If you get out into the storm, let us know what you see by submitting an observation.

Regioni coperte