It's a relatively small avalanche but I'd never seen one before. They are the stuff of legend, especially in the minds of those who don't live in snow country. I can't place a particular TV drama from the sixties but I know that where I first heard the shout "Avalanche!".
We were out about two hours on a trail leading from Lake Louise towards the Victoria glacier. It was very cold but sunny. We had been told to expect avalanches with the sun warming up the ledges. The trail leads to the Plain of Six Glaciers. The avalanche we saw was snow falling off the top of the Lefroy Glacier.
Everywhere you see evidence of avalanches past such as this one.