Lake Tahoe is showing some severe impacts from the changing climate. Indicators released Thursday in the annual “State of the Lake” report packed a few surprises, even for scientists.

For one thing, the lake has been warming faster than ever recorded. In 2015 the lake’s average temperature rose 0.48 degrees Fahrenheit — and over the last four years, the rise was 15 times faster than the lake’s historic warming rate. “That came as a surprise to me,” says Geoffrey Schladow, a UC Davis freshwater scientist and lead author of the report.