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South Coast

South Coast

Date Issued
Tuesday, 09 March 2010 04:00 PM
Valid Until
Friday, 12 March 2010 04:00 PM
Next Update
Wednesday, 10 March 2010 04:00 PM

Sea-to-Sky

Wednesday Thursday Friday
Alpine 2 Moderate 4 High 4 High
At Treeline 2 Moderate 3 Considerable 4 High
Below Treeline 1 Low 1 Low 2 Moderate

Duffy Lake & Inland Areas

Wednesday Thursday Friday
Alpine 2 Moderate 3 Considerable 4 High
At Treeline 2 Moderate 3 Considerable 3 Considerable
Below Treeline 1 Low 2 Moderate 2 Moderate

Primary Concerns

Persistent Slab

  • Which Slopes?

    The orange segments show which aspects are most affected by the primary concern. If the icon is completely orange, this means the primary concern exists on all slopes.

  • What Elevation Zone?

    Alpine, Treeline and Below Treeline are separate zones with distinct characteristics. The arrow points to the zones most affected by the primary concern. For more information on elevation zones, click here.

  • When?

    Indicates the time of day where the primary concern is likely to be a problem. Avalanche conditions can change between shady, cool mornings and sunny, warm afternoons. If both icons appear, it means the primary concern is present all day.

In the southern Chilcotin Mountains there are a number of different buried surface hoar layers. The distribution of the surface hoar is widespread and exists right to mountain top and in unsuspecting wind exposed terrain. Despite that fact that the surface hoar is slowly strengthening and not reacting as readily as a few weeks ago, you still cannot be sure that a slope won't slide. Experience with surface hoar shows it often surprises even the best of the best after it appears to be dormant and the danger is Moderate. You will probably not get any snowpack warning before an avalanche occurs. Avoid riding on steep convex rolls, steep planar slopes, and morraines at treeline and in the alpine.

Wind Slab

  • Which Slopes?

    The orange segments show which aspects are most affected by the primary concern. If the icon is completely orange, this means the primary concern exists on all slopes.

  • What Elevation Zone?

    Alpine, Treeline and Below Treeline are separate zones with distinct characteristics. The arrow points to the zones most affected by the primary concern. For more information on elevation zones, click here.

  • When?

    Indicates the time of day where the primary concern is likely to be a problem. Avalanche conditions can change between shady, cool mornings and sunny, warm afternoons. If both icons appear, it means the primary concern is present all day.

Isolated pockets of wind slabs in the alpine were built from periods of southeasterly wind on Sunday.

Confidence: Good

Weather Forecast

A series of Pacific storms will give us that long awaited return to true winter conditions. Get psyched.Wax your skis and / or wrench on your sled. Precipitiation really gets going on Wednesday night.

Wednesday: Expect light snow off and on through the day. The freezing level should remain near 700m. Light westerly winds.

Thursday: Heavy snow. 20-30 cm. The freezing level rising to near 1000m. 60-80 km/hr westerly winds.

Friday: Heavy snow. 15-30 cm.

Updated March 7

Avalanche Activity

Avalanche activity is low. As discussed in the primary concerns, avalanche potential remains in the southern Chilcotin Mountains.

Travel Advisory

This is for Coastal areas and the Coquihalla area. For the southern Chilcotins read the 1st primary concern.

Terrain to watch: Steep slopes near mountain top or exposed ridgelines that have small lenses of wind slab on them.

Techniques to manage hazard: Ski cut terrain features before you commit to them.

Snowpack

In the Southern Chilcotins, recent compression tests gave moderate sudden results on two different surface hoar layers down 25-35cm and 45cm. On the west side of the Bridge-Lillooet divide these surface hoar layers down 50cm and 60cm. In the Duffy Lake area, surface hoar that was buried near the end January is down 30-50 cm.

Prepared by Greg Johnson

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