Avalanche Forecast Jasper National Park

Friday 1st February 2019

Avalanche Danger Ratings Fri 1st Feb 4:00PM Danger Ratings Alpine: High Danger Ratings Treeline: High Danger Ratings Below Treeline: High Storm Slabs Storm Slabs Deep Persistent Slabs Deep Persistent Slabs

Parks Canada Forecaster: jasper snow safety

Date Issued:

Valid Until:

Highway 93N, Icefields Parkway is Closed from Athabasca Falls to Sask River Crossing. Expected opening for both: Saturday at 18:00. (low confidence) Check Alberta511 for latest updates

Weather Forecast

Periods of snow, at times heavy. Accumulation in Icefields: 18cm overnight Thursday, with a further 20cm on Friday; 8 -10cm Saturday. Temps drop over the day Saturday with an overnight low of -28. Valley bottom freezing levels. Mostly light SW winds, gusting at ridge tops. A detailed mountain weather forecast is available from Avalanche Canada.

Snowpack Summary

Forecasted storm snow over this weekend, 18cm at the time of report, (potentially a further 30cm), will change everything. The existing upper snow pack continues to settle over surface hoar, now down 30cm. Solar aspects have buried surface sun/temperature crusts at TL and below. Below that, a strong mid-pack sits over a deep persistent weakness.

Avalanche Summary

Poor visibility through the forecast region. No new avalanches observed or reported. Help forecast - share observations HERE, on the Mountain Information Network!

Confidence

The weather pattern is stable

Storm Slabs Storm Slabs

Likelihood

Likely

Expected Size

1 - 2.5

Avoid avalanche terrain until the storm subsides and the snowpack can settle.

Avoid exposure to avalanche terrain, large avalanches may reach the end of run out zones.Avoid avalanche terrain during periods of heavy loading from new snow and wind.

Aspects: All aspects.

Elevations: Treeline, Below Treeline.

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Deep Persistent Slabs Deep Persistent Slabs

Likelihood

Likely

Expected Size

1.5 - 3.5

New snow may overload the deep persistent weakness. Avoid avalanche terrain.

Avoid avalanche terrain during periods of heavy loading from new snow and wind.Avoid exposure to overhead avalanche terrain, large avalanches may reach the end of run out zones.

Aspects: All aspects.

Elevations: All elevations.

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