Science & EnvironmentPacific Northwest heat wave was a freak, 10,000-year event, study findsBy Monica Samayoa (OPB)Sept. 29, 2022 12:18 a.m.Scientists say last summer’s heat wave was extremely rare and made worse by climate change.📨 Daily news in your inboxSign up today for OPB’s “First Look” – your daily guide to the most important news and culture stories from around the Northwest.EmailPlease leave this field blankSign up