Event
Northwest Pacific Heat Wave June 2021
United States
The most severe heat wave in the history of the Pacific Northwest and Canada gripped the region in all-time record-breaking triple-digit heat at the end of June. The heat wave was due to a major heat dome, or sprawling zone of high pressure, and bulging jet stream that sent hot air flowing into the region for several days. Both the record temperatures and record-strong high pressure system have strong ties to human-caused climate change.