| Posted: 11:19 a.m., Tuesday, December 9, 2003 |
Huntington Ravine has CONSIDERABLE, MODERATE, and LOW avalanche danger. Damnation has Considerable avalanche danger. Natural avalanches are possible and human triggered avalanches are probable. Unstable slabs are probable on steep terrain. Be increasingly cautious in steeper terrain. North, Yale, Central, Pinnacle, and O'Dells have Moderate avalanche danger. Natural avalanches are unlikely and human triggered avalanches are possible. Use caution in steep terrain. South and the Escape Hatch have Low avalanche danger. Natural avalanches are very unlikley and human triggered avalanches are unlikley. Use normal caution.
North winds peaking at 98 kph (61 mph) loaded Southern aspects through most of yesterday. Natural avalanche activity occured in Damnation yesterday between 8:30am and 1:30pm. A fracture line was visible 5 or 6 meters (16-19 feet) below the horizon spanning the entire start zone. It ran the full distance of the gully. I suspect cornice fall triggered the class 2 avalanche. On the butress east of Damnation cornice fall cleaned out a track of loose snow down 3/4 of the way to the fan. Currently Damnation is at Considerable due to more cornice fall potential. With light winds and sunny weather, raditional heat is being absorbed within the corniced area weakening the tensile strength. The areas from Right Gully to Lion Head also picked up significant loading on Monday. Evidence of avalanche activity was witnessed here as well. Snowfields now exist from Lion Head towards Right gully just south of the Lion Head trail. So be aware that you can enter avalanche terrain very quickly if you get of the summer trail.
Freezing rain and rain is forecasted to begin tomorrow night into Thursday. Expect it to be a hard hitting and fast moving weather maker potentially bringing 1.75 to 2.5 cm (.70 to 1 inch) of water. This should create havoc with snow in avalanche terrain, on the trails, and in your driveway. Move all the snow you want to move by tomorrow or expect to replace your shovel with a backhoe.
You absolutely need skis or snow shoes to travel off the beaten path. Even with them expect your trip to be slow and difficult. With rain coming severe crusts may develop in the woods and unpacked trails. We will begin traveling on the Sherburne today to avoid this crust scenario.
THE LION HEAD SUMMER TRAIL IS CLOSED. THE WINTER ROUTE IS OPEN. THE UPPER WINTER SIGN WILL NOT GO UP UNTIL IS POSSIBLE FOR US TO GET UP THERE.
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.
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Avalanche Advisory Archives.
United States Avalanche Danger Descriptions.
Échelle Canadienne de risque d’avalanche.
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