Overview

• The National Weather Service issued extreme heat warnings and advisories across parts of California, Oregon, Washington and Idaho, with some locations challenging daily records.
• Portland and surrounding areas remain under an extreme heat warning until 11 p.m. Tuesday, with highs of 90–98°F and overnight lows holding at 60–70°F.
• Nearly 8 million people are under heat alerts, and the NWS cautions there will be little nighttime relief, a risk the CDC links to hundreds of U.S. deaths each year.
• AccuWeather expects the strong upper ridge to hold through Tuesday before weakening on Wednesday, leading to gradual cooling that still leaves temperatures above average.
• Hot, dry conditions are elevating wildfire danger where fires are active, including California’s Pickett Fire and Oregon’s Flat fire.