Avalanche Forecast Little Yoho

Saturday 2nd February 2019

Avalanche Danger Ratings Sat 2nd Feb 4:00PM Danger Ratings Alpine: Considerable Danger Ratings Treeline: Considerable Danger Ratings Below Treeline: Considerable Storm Slabs Storm Slabs Deep Persistent Slabs Deep Persistent Slabs

Parks Canada Forecaster: stephen holeczi

Date Issued:

Valid Until:

Great ski quality in sheltered areas. Give the new snow time to settle before committing to bigger terrain features with consequence.

Weather Forecast

Arctic air has moved in and temperatures will see lows to -30C and highs around -20C for the next few days.  Winds have switched to the NE and will become light on Sunday.  Only trace amounts of new snow are in the forecast.

Snowpack Summary

30-40cm of new snow with moderate to strong variable winds are building slabs in lee areas of the alpine. In locations up to 2200m a thin but reactive layer of surface hoar and/or crust is found down 60-70cm. The mid and lower snowpack have few weaknesses, however concern remains for the weak facets below the Dec 10 interface in shallow areas.

Avalanche Summary

Skied were obscured all day Saturday in the Little Yoho area so no observations were made.

Confidence

Storm Slabs Storm Slabs

Likelihood

Likely - Possible

Expected Size

1 - 2.5

Expect storm slabs to be reactive in the short term on many aspects. Especially watch areas where the buried Jan. 17th surface hoar and/or crust layer is present . This has been found below 2200m and where found, was reactive before this last storm.

Aspects: All aspects.

Elevations: All elevations.

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Deep Persistent Slabs Deep Persistent Slabs

Likelihood

Possible - Unlikely

Expected Size

2 - 3

In isolated shallow snowpack areas of Little Yoho the new snow load may wake up the deep persistent facet weakness.

Use conservative route selection, choose moderate angled and supported terrain with low consequence.Avoid thin, rocky or unsupported slopes.

Aspects: All aspects.

Elevations: Alpine, Treeline.

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