Avalanche Advisory Archive Pre-2016
| Date Issued: | 2014-01-27 |
|---|---|
| Danger: | 1 |
| Trend: | 3 |
| Probability: | 0 |
| Size: | 1 |
| Problem: | 0 |
| Discussion: | The National Weather Service Forecasts- TODAY...MOSTLY CLEAR EARLY IN THE MORNING THEN BECOMING PARTLY TONIGHT...MOSTLY CLOUDY. CHANCE OF RAIN. LOWS AROUND 34. LIGHT TUESDAY...RAIN LIKELY. HIGHS AROUND 40. LIGHT WINDS. Temperatures continue to remain quite warm after our 9\" of rain in the last two weeks. The snowpack settled and consolidated quite a but during this event over that time and is quite stable now. Temperatures overnight last night stayed above 46 degrees both at the Mt Roberts Tram Summit and at the Eaglecrest Summit. The cooler air has been lying in the valley's. Avalanche danger is LOW at this time. Be aware that during the later part of the day on SSW facing slopes danger will increase slightly with the chance of small wet spring avalanches. Mostly in the point release form. Also be aware that there is a tremendous amount of glide activity on all aspects. If you are playing in the mountains be cautious on slopes that have signs of glide activity. Avoid lingering under glade cracks. Glade avalanches are very hard to predict and yet are still occurring. Get out above the fog and enjoy another great day! |
| Tip: | Glide: When the entire snowpack slowly moves as a unit on the ground, similar to a glacier. Glide avalanches: Glide occurs when the entire snowpack slowly slides as a unit on the ground, similar to a glacier. Don't mistake glide for the catastrophic release of a slab avalanche that breaks to the ground. Glide is a slow process, that usually occurs over several days. Glide occurs because melt water lubricates the ground and allows the overlying snowpack to slowly \"glide\" downhill. Usually, they don't ever produce an avalanche but occasionally they release catastrophically as a glide avalanche. So the presence of glide cracks in the snow do not necessarily mean danger. It's often difficult for a person to trigger a glide avalanche but at the same time it's not smart to be mucking around on top of them and especially not smart to camp under them. We tend to find them in wet climates and when they occur in dry climates they do so in spring when water percolated through the snow or sometimes during mid winter thaws. When do they come down? Like an icefall, they come down randomly in time--when they're good and ready--not before. You would think that they would come down during the heat of the day or when melt water running along the ground reaches its maximum. But oddly enough, they tend to release just as often with the arrival of cold temperatures following melting as during melting itself. It's hard to play a trend with glide avalanches. They come down when they're good and ready and it's impossible to tell when that is. Just don't spend much time underneath them. |
