Watch for a weak freeze Sunday morning to prime conditions for poor travel and likely an avalanche cycle Sunday through Tuesday as a ridge brings warm air and sunny skies.
Summary
Weather Forecast
A weak freeze is expected Sunday morning as warm air invades from the south through the day. Watch for SIGNIFICANT HEATING as calm winds and clear skies allow strong solar effect combined with freezing levels in excess of 3500m. With no freeze expected Monday or Tuesday expect the heating effects to compound each day as freezing levels reach 3800m.
Snowpack Summary
We are into a spring cycle for most of the Little Yoho area except in high north facing alpine. Occasional pockets of deep instability may still be encountered and triggered from shallow locations during warm periods of the day. 5cm of recent snow that is sitting on crusts every but above 2600m on North aspects became moist today with solar heating
Avalanche Summary
Loose wet activity to sz 2 on steep solar slopes with the surface snow failing over the melt-freeze crusts.
Confidence
Problems
Loose Wet
All avalanche terrain should be avoided later in the day when the crust on top of the snowpack breaks down due to daytime heating. A weak freeze is expected Sunday Am and NO FREEZE is expected Monday or Tuesday.
- Travel early on frozen crusts before the heat of the day.
- Watch for clues, like sluffing off of cliffs, that the snowpack is warming up.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Cornices
Watch for cornices to become active Sunday through Tuesday as the freezing levels reach their highest point yet this spring.
- Pay attention to overhead hazards like cornices.
Aspects: North, North East, East, South East, South.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Apr 17th, 2016 4:00PM
