A) Top Surface Melting is most strongly driven by warm wind. A 24 hour, 50 degree thaw with winds in the 20-30 mph range can melt a couple inches or more of ice. Holes of several types and sizes are also common after a windy thaw. Heavy rain over 24 hours with only moderate wind will result in about an inch of ice loss. Most of that is from the warm air.
There are 30 calories in a 1 cup popped serving of Orville Redenbacher's Movie Theater Butter Popcorn. Calorie breakdown: 49% fat, 46% carbs, 5% protein.
If you share an unbuttered (8-cup) small with a fellow moviegoer, each of you will walk away with about 200 calories (seasoned with 340 milligrams of sodium). That's the best you can expect from movie theater popcorn, unless you ask the theater to pop you a batch without salt.