Anthony Cupaiuolo has been skiing the Sierra Nevada backcountry near Lake Tahoe since 1997. But over the last decade, he’s noticed some changes. “Outside of last year, which really sticks out as an anomaly, we haven’t seen [snow] coverage down at lower elevations nearly as much as we would in the late ’90s and early 2000s,” said Cupaiuolo, who usually skis at least 80 days every winter, with a majority of them spent in the backcountry.