The summit received 28.5 cm (11.2 in) of snow in the past 24 hours with a density of 10.7%, or 107 kilograms per cubic meter. Snow is expected to continue in the mountains with another 8 cm (3+ in) or more anticipated. Snow began at the higher elevations around 10 am yesterday morning from the south. Winds shifted to the west during the early evening where they are currently holding. Winds remained light through the shift which has had a significant bearing on the current slab instabilities. Initially snow fell onto the old surface as loose snow and a very light slab. As winds increased through the evening denser more cohesive slabs began forming over the low density snow beneath. This weak interface between the old surface and new snow should be the primary location for slab fracture today. West winds increased last night and are forecasted to be between 100-115 kph (60-70 mph) with higher gusts today. As the day progresses winds are expected to shift to the NW which is an ideal scenario to load and cross load most slopes and gullies in the Ravines. I expect natural avalanche activty to occur today and possibly fill back in to reload for another cycle. If the weather forecast plays out the summit may see close to a total of 45 cm (15 in) before tapering off tonight. High westerly winds will load slopes with significant new snow today, tonight, and into tomorrow. Expect an elevated avalanche danger through the weekend for many areas in the Ravines. If you are out digging in the snow this weekend it may be interesting to look for faceting near the old surface layer beneath the new snow due to the extreme temperature gradients. If this develops into a problem we will mention it in the weekend advisories.

In addition to avalanche concerns climbers should expect running water and ice dams. As temperatures continue to drop anticipate the ice dam dragons to be raising their heads once again. Ice dams can vary in size and impact. They can range from a slight annoyance by getting your gloves wet to a significant problem flushing you down slope with a couple hundred gallons of water. Be cautious and use appropriate protection.

The John Sherburne ski trail has once again been hit hard by rain and warm weather. Expect new snow over areas of ice, some blowouts, abrupt water bars, open holes, and running water.

THE LION HEAD WINTER ROUTE IS OPEN. This is a steep and challenging route. Ice axe, crampons, and the skill to use them well is necessary for safe travel. Remember, it is always easier to go up than come down.

AS ALWAYS, THIS ADVISORY IS ONE MORE TOOL TO HELP YOU MAKE YOUR OWN DECISIONS IN AVALANCHE TERRAIN. It should be used along with your own snow stability assessments, knowledge of safe travel techniques, skill in reading mountain weather's effect on the snowpack, and avalanche rescue.