Short lines, steep runs, 700+ inches
Flat light in January, wet snow
Full disclosure here: for whatever it is worth, this is my hometown resort and I love this place, and have grown to love it even more after skiing some resorts in the Lower 48. The top of Alyeska has lots of steeps that will burn your quad like few other resorts (compare with Whistler-Blackcomb). While I can ski Lower 48 resorts all day without taking a break (munching sandwiches on the lifts), I need to take a couple of breaks a day while skiing the top of Alyeska because of the combination of steep runs (like the North Face, South Face, High Traverse, and Max's) and snow that often has high moisture content. The bottom of the mountain has skiing for beginners, and both mid-mountain and upper-mountain have lots of options for intermediate skiers. If you ski Alyeska in January, bring goggles for flat light conditions because the low angle of the sun in January doesn't rise above the neighboring ridge. By Februrary and March, however, blue bird skies become increasingly common.