How'd that happen? Photo depicts double snow line on Canadian mountains
Last week's snow event had some complex temperature alignments toward the end of the snow when warm air began to move back into the region. But up near the Fraser River Valley, cold air continued to blow in from chillier locales farther north into British Columbia interior. It made for three levels where it was very cold aloft, warmer in the mid levels that mild Pacific air began to encroach, but still cold at the surface due to the Fraser Wind.
James Lepp was up in Abbotsford, B.C. and was treated to a rather stark visualization of the effect when he noticed the "stripe of warmth" on the side some of the local mountains. You can clearly see where that warm layer sat what fell as rain.
Lepp said the snow in the bottom layer had fallen earlier in the day, and now he was dealing with freezing rain, which would make sense. Freezing rain is caused in this exact setup, where snow falls into a warmer layer, melts to rain, and then freezes when it reaches the freezing layer of air near the ground.
Thanks for the unique photo!