Avalanche Forecast Banff Yoho & Kootenay National Park

Saturday 2nd February 2019

Avalanche Danger Ratings Sat 2nd Feb 4:00PM Danger Ratings Alpine: Considerable Danger Ratings Treeline: Considerable Danger Ratings Below Treeline: Moderate 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

Frigid arctic air will win the battle for the weekend with temperatures down to -30C for the weekend and highs below -20C.  Winds will diminish as we switch to an E/NE flow with no snow in the immediate forecast. 

Snowpack Summary

25-40cm of new snow with moderate to strong variable winds. Up to 65cm sits over the Jan.17 surface hoar which has been found up to 2300m. The mid-pack is quite dense above the Dec 10 interface down 80-160 cm. In shallower areas weak facets and depth hoar exist below the Dec 10 interface. In deeper snowpack this basal weaknesses is less pronounced

Avalanche Summary

Local ski hills reported avalanches up to size 2 within the storm snow. No other avalanches were observed or reported with limited visibility.

Confidence

Storm Slabs Storm Slabs

Likelihood

Likely - Possible

Expected Size

1 - 2.5

25-40cm of new snow has fallen under warmer temperatures at all elevations which will be reactive in the short term. The Jan. 17th layer is buried up to 65cm deep and consists of surface hoar, facets or crust and can be found up to 2300m.

Use caution in lee areas in the alpine and treeline. Storm snow is forming reactive slabs.

Aspects: All aspects.

Elevations: All elevations.

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Deep Persistent Slabs Deep Persistent Slabs

Likelihood

Possible

Expected Size

2 - 3

The new snow load may start waking up the deep persistent facet weakness down 80-160 cm. This is of greatest concern in shallow snowpack areas where the basal facets are weakest.

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

Aspects: All aspects.

Elevations: Alpine, Treeline.

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