Travel in the upper foothills and mountains is expected to be seriously affected Friday as a snowstorm blankets the Sierra Nevada. Whiteout or near-whiteout conditions are predicted in the mountains until the National Weather Service’s winter storm warning expires at 11 p.m. Friday. Homewood Mountain Resort and Squaw Valley Alpine Meadows each reported 16 inches of snow Wednesday, bringing them up to 34 and 28 inches, respectively, since the first of two storms began Monday night. Kirkwood, Tahoe Donner and Sierra-at-Tahoe have reported 2 feet of so far this week.