Issued: Mon, Apr 09, 2018 at 11AM

Expires: Thu, Apr 12, 2018

Above 2,500ft Considerable

1,500 to 2,500ft Considerable

Below 1,500ft Low

Degrees of Avalanche Danger ?

1. Low
2. Moderate
3. Considerable
4. High
5. Extreme

Avalanche Danger Rose ?

Avalanche Problems ?

Problem Details

Problem #1: Wet Avalanches

Location: Steep E-S-W aspects below 5,000ft. Temperatures continue to rise, with daytime freezing levels rising up to 4,500ft (even higher if the sun comes out). Melting and softening will increase the danger of human-triggered wet slabs and large, dangerous wet sluffs. We’ve have been getting only shallow overnight freezes below 4,500ft, which increases the likelihood of wet slides during the day. Restrict travel on these aspects to the early-morning hours when the snow is still frozen. If the snow softens to ankle-deep or more, it’s time to get off those steep sunny slopes. Keep an eye on our weather stations, watch the temperature trends, and plan accordingly.

Problem #2: Wind Slab

Location: Wind loaded E-S-W aspects, above 5,000ft. North winds last week formed recent wind slabs up to 8″ thick on slopes that are lee to the north wind. Keep an eye out for wind loaded slopes where these recent surface slabs may be thick enough to sweep a person down into high-consequence terrain.

Fresh soft slab sensitive to human weight. Mt. Ripinsky, Thursday March 29th.

 

Recent Avalanche Activity

Isolated natural wet-loose avalanches occurred this weekend in afternoon hours on steep, rocky South and Southwest aspects. These slides were mostly size 1-2.

Recent Weather

Temperatures are pretty steady this week, with the freezing level around 3000ft at night, rising to 4500ft during the day. Clouds and light rain/snow will continue Tuesday-Wednesday, with nicer weather returning Thursday.

 Snow Depth [in] Last 24-hr Snow/SWE [in] Last 3-days Snow/SWE [in]  Today’s Freezing Level [ft]  Today’s Winds Next 24-hr Snow/SWE
Mount Ripinsky @ treeline
56″ 0″ / 0.05 0″ / 0.05 4,500 light, N 0″/ 0.20 *
Flower Mountain @ treeline
 42″ 0″ / 0.00 0″ / 0.00 4,500 light, NW 0″/ 0.10*
Chilkat Pass @ 3,500ft
 20″* 0″ / 0.00 * 0″ / 0.00* 4,000 light, NW 0″/ 0.00 *

( *star means meteorological estimate )

Additional Info & Media

If you get out on the snow, send in your observations!

Posted in Transitional Zone Forecasts.
Erik Stevens

Forecaster: Erik Stevens