Thank you for a great season! Regular avalanche forecasts have ended. This most recent update is from 7 AM on Monday, April 28, 2025. We will be issuing intermittent updates through May 1st. You can submit observations and avalanches HERE, and check out the most recent observations and avalanches HERE.
During the spring, there are typically three different avalanche problems:
Wind can rapidly load snow onto steep slopes, making those slopes more prone to avalanching. Avoid slopes greater than 30° in steepness if you see signs of wind-drifted snow, such as rounded and pillowy features, and shooting cracks. In some cases, wind-drifts can sound hollow like a drum.
When cold, dry snow becomes wet for the first time, it almost always means wet sluffs (loose snow that fans outward as it descends).
Larger wet slab avalanches can happen when melt water percolates through a layered, winter snowpack for the first time especially after multiple days of warm temperatures combined with no refreeze at night.
Glide avalanches occur regularly in spring as the entire snowpack slides slowly on the ground like a glacier until they suddenly release into a full-depth avalanche. These occur periodically on steep rock slabs and occasionally on steep grassy slopes. Avoid crossing under any slopes with cracks to the ground in the snowpack. Remember, they come down randomly, even at night.
Warning signs may include:
These signs mean it's time to head home or change to an aspect with cooler snow. Remember, even "smaller" slides can be dangerous in high-consequence terrain, such as above a terrain trap, trees, rocks, cliffs, or a long, large avalanche path.
We almost always get winter-like snow storms well in the spring. Treat each storm just like you would in winter. Avalanches can occur within the new snow typically from 1) low-density layers deposited during the storm, 2) high precipitation intensity during a storm, and 3) from wind slabs created during the storm.
It's easy to test the new snow as you travel by jumping on small test slopes to see if they avalanche or dig down with your hand to see how well the new snow is bonding. Snow can change dramatically in both space and time, so never let your guard down. Avoid any steep slope with recent wind deposits.
Practice good backcountry protocol:
If you are looking to travel uphill at the ski areas then check out the UAC Uphill Travel Policypage before heading out.
Researchers Sara Boilen and Ian McCammon are developing an open-source tool to help individuals mitigate risk in avalanche terrain. The project's first stage involves interviewing backcountry recreationalists who have been traveling in avalanche terrain for at least one season. All participants will be entered to win prizes. Please encourage taking 1-2 minutes to fill out their initial survey. Link HERE
Did you know the UAC has a podcast? Check out the most recent episode detailing the history of the Friends group HERE.
We will continue to post avalanches and observations. You can submit what you're seeing HERE, and check out all recent avalanches and observations HERE.
The weekend storm under-performed with a trace to 1" of new snow reported. We should see a couple of disturbances this week with light precipitation. Click HERE to get to our weather page for up-to-date weather station data that will help with planning your tour based on new snow, temperature, wind speed, and direction.
Our partners at the National Weather Service put out a weather discussion HERE and the mountain weather forecast will continue to be updated twice a day through the last week of April.
CLICK HERE FOR MORE GENERAL INFO AND FAQ
This information does not apply to developed ski areas or highways where avalanche control is normally done. This forecast is from the U.S.D.A. Forest Service, which is solely responsible for its content. This forecast describes general avalanche conditions and local variations always occur.
