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Avalanche Forecast

Feb 19th, 2013–Feb 20th, 2013
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Sea To Sky.

Confidence

Fair - Timing, track, or intensity of incoming weather is uncertain on Friday

Weather Forecast

Wednesday: Freezing Level: 250m increasing to 800 in the afternoon. Wind: Light SW.  No significant precip.Thursday: Freezing Level: 500m increasing slightly during the day.  Wind initially light SW increasing to strong SW in the afternoon.  5 - 10 cm of snow expected during the day.Thursday Night: Freezing Level: 900m, 20 -40 cm expectedFriday: Freezing Level: Initially 900m, falling throughout the day. 10 – 25 expected during the day.

Avalanche Summary

We continue to receive observations of isolated small soft slabs in the alpine that are sensitive to skier triggering.

Snowpack Summary

Relatively small pockets of wind slab which exist at higher elevations are expected to be mostly unreactive. but may be triggered by skiers in isolated pieces of terrain near ridge crest. In shaded areas at treeline and below the new snow may overlie surface hoar which is reported to be reactive in the Meager Group (upper Lillooet). Several crusts can be found in the snowpack, especially on solar aspects; however, reports indicate these interfaces have settled out fairly rapidly in most areas. The mid and lower snowpack layers are generally strong and well settled.Total snow depths vary from around 400 cm in the south to around 180 cm in the north.

Avalanche Problems

Wind Slabs

You may find the odd small wind slab in isolated terrain in the Alpine. Watch for triggering in gullies and in the lee of ridge crests too.
Be careful with pockets of wind slab near ridge crest.>Plan escape routes and identify safe zones before committing to your line.>

Aspects: North, North East, East, South East.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 2