Western Washington braced for what the National Weather Service in Seattle called “catastrophic” conditions Wednesday as an atmospheric river drenched the state.

A powerful magnitude 7.6 earthquake near Hokkaido prompted Japan to issue a tsunami warning, highlighting both strong ground shaking and immediate coastal hazards for Sapporo and nearby communities. Details in the post are limited, but the alert suggests authorities anticipated potentially dangerous waves following the mainshock.

About 20,000 households were without power late Saturday afternoon, from Glacier View to Knik Goose Bay Road. Some railroad crossings were disabled due to wind damage.