Why do we publish avalanche forecasts at 4:00 p.m.?

We talk with Avalanche Canada forecaster Ari Hanna about the reason why we publish at 4:00 pm, what uncertainty that adds to the forecasting, how they collect data, and what happens if something unexpected happens overnight. Long story short: check the forecast the night before you're planning to go out into the backcountry, and then again the morning of!