Plenty of ski and weather apps provide snowfall estimates, but if you want specifics—like which resort, Vail or A-Basin, got the bigger dump in the last storm—Skireport.com's is your best bet. If you have an iPhone, this tidy app can give you powder alerts by text or tweet for depths up to 14 inches. At the resort, Maprika offers maps of most U.S. ski areas and lets users share their location in real time, so you can find the rest of your group after you mistakenly ski down to the wrong lift. Free; Android and iPhone.
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