Double caution about avalanches. Not only stay off those steep slopes, but be aware that the runout from an avalanche can go a long way, often across a steep-sided valley and partway up the other side. Cornices can be particularly hazardous--if you're on them, they break loose, and if you're under them, they can come down on you. For those in the Pacific NW, we have the Northwest Weather and Avalance Center, which provides avalanche forecasts and has some useful general info. Other areas have such centers, too. If you're going to travel in avalanche country (basically any place that isn't flat), check the forecast before you go and learn how to assess snow conditions while you're there (for which a shovel is needed). If there is any kind of winter camping or snow safety or avalanche safety class offered in your area, please take advantage of it. If you're in a group, each person should have a shovel, probe and avalanche transceiver and know how to use them. They are not a substitute for avalanche avoidance, but at least provide a small chance of getting people out. If you're alone, such gear (except the shovel, which has other uses) won't help, so stick to flat areas.

Holing up in tree wells can be fine in the Rockies, where there's dry, fluffy, light snow and less of it on the trees, but, as Jim says, it's highly dangerous with our soggy Northwest "cement" ready to come down on you. Falling into a tree well in deep snow is also not advisable; you may not get out!

Especially here in the Pacific NW, with our soggy snow and often rain even at higher altitudes, keeping dry is super important. Strip down to minimal layers, even just a base layer, while you're moving so you don't get sweaty. Sweat (which will freeze when you stop) can be just as dangerous as wet snow or rain. Take extra precautions at all times to keep your insulation dry. Extra dry clothing--at least a base layer--to wear inside your sleeping bag is a good idea.

Thank you, Jim, for reminding us of these winter safety issues. I took a really good snow class once (three hours' lecture and two days practicing up in the snow), but that was 25 years ago! Since I plan to get out at least a few times this winter (due to being laid up last summer), I need to review!