Juneau Area Avalanche Advisory
2006-05-07
Mt. Stewart
by Bill Glude, SAAC Observer
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We went up high on Mt. Stewart today to check the stabilization of the snowpack over the days since our last unusually late-season avalanche cycle. That cycle was the largest of the season, triggering big slabs regionwide.

The weather has been warmer since the 4th, helping the new snow from last week bond and stabilize. Heavy rain has reached 800m and light rain has reached 1000m over the last few days, triggering the slopes that were ready to release and settling those that did not slide. Even on the higher elevation north aspect that we tested today, our blocks were quite strong, and we saw no signs of instability.

The snowpack should be generally solid now unless we get quite a bit more new snow. The higher elevations that have stayed dry so far will probably still have some activity when they thaw.

So spring is very late this year. When we usually expect warm sun and perfect corn snow, we instead have fresh powder up high and cold rain at the trailheads. Conditions are quite good, but you will have to pass through the rain zone to get to the good snow up high, and the snow can rapidly become sticky or heavy as the freezing level fluctuates.

Field Notes
Photos
Our test block site at 900m in the North Bowl of Mt. Stewart today. On a 42° slope, we had three blocks release on multiple hard jumps at average shear quality with an 85 Kg tester (RB6Q2, CAK6Q2, AK6Q2) and one release with a 75Kg tester on the second, harder jump as a fast, clean shear (AK5Q1). These are generally strong results, and we saw no signs of instability today. The avalanche cycle of last week is over.
Nathan Adams enjoys the descent. The snow quality was surprisingly good for the first week in May, slightly moist but fluffy and easy to turn in.
Nathan slaloms through the trees in heavy snowfall. Though the base layers below about 600m were obviously slushy, the snow stayed good until it became wet and sticky down at 500m.
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