Issued: Sun, Apr 22, 2018 at 8AM

Expires: Sun, Apr 22, 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

Observations from Friday/Saturday were mixed, with some areas containing slabby new snow that wants to propagate with human weight. Other areas (protected from the wind) were less reactive with great riding. In general, the recent snow is starting to bond, but there remain areas of wind slab where human triggered avalanches will be likely. Avoid wind loaded areas with cohesive surface slabs.

Problem #1: Storm Snow

Location: All aspects 30 degrees and steeper, above 2,000ft. 6-12″ of new snow fell Thursday, with strong south winds. The new/old snow interface underneath is crusty/icy on sun-exposed aspects, and facetted/weak on shady north aspects. Bonding of the new snow to this old surface is fair, and slowly improving. Still, recent soft slabs (up to 60cm thick in wind-loaded areas) may propagate across slopes given the slick/crusty surface underneath. Look for signs of wind loading (drifts, rounded wind pillows, cornices, etc), and avoid these areas. If you sense hollow, slabby, or cohesive surface snow it would be a good idea to find safer, less wind-affected terrain to ride. Hand shears, small test slopes, and cautious ski cuts will be good ways to  evaluate and manage this danger in the field.

 

Recent Avalanche Activity

Isolated natural wet-loose avalanches have been occurring over the last week, in the afternoon hours on steep, rocky South through West aspects. These slides have been mostly size 1-2 so far.

Recent Weather

6-12″ of wet snow fell above 2,000ft Thursday (highest amounts in the Lutak Zone and lowest at the Pass). South winds were moderate-strong. Sunday will bring increasing precipitation with snow levels near 1,500ft. Rain/snow will become heavy over night into Monday, with 1.5 – 2″ of precipitation total. 

 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
60″ 1″ / 0.10 14″ / 1.10 1,500 light, S 12″/ 1.00 *
Flower Mountain @ treeline
 42″ 1″ / 0.10 12″ / 0.70 1,500 light, SE 12″/ 1.00 *
Chilkat Pass @ 3,500ft
 20″* 1″ / 0.10 * 7″ / 0.50* 1,000 light, SE 10″/ 0.75 *

( *star means meteorological estimate )

Additional Info & Media

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

Posted in Chilkat Pass Forecasts.
Erik Stevens

Forecaster: Erik Stevens