No weather forecast is perfect, particularly when it comes to predicting pow. But if you start to recognize your fellow addicts in line for first chair at whatever ski area happens to be boasting the morning's biggest snowfall, you can thank — or blame — Joel Gratz and his Open Snow app for blowing it out. Download the free app for iOS or Android, then subscribe to Gratz's Colorado Daily Snow and set powder alerts for all of your favorite mountains. Gratz tends to really nerd out on all the relevant weather science and computer storm models, which you'll appreciate as you check the app obsessively every night and again every morning when the 5 a.m. snow-stake tallies go live. Whether he got it right or wrong, it'll give you something to chat about on the chairlift.