40M Under Heat Alerts as Southwest Tops 100°
40M Under Heat Alerts as Southwest Tops 100°
US · Published Mar 18, 2026
A historic heat wave is impacting the Southwest, with temperatures 20-35°F above average.
Nearly 40 million people are under Extreme Heat Warnings and Advisories.
The heat wave may accelerate snowmelt, strain water supplies, and extend wildfire season.
Early heat wave triggers warnings for millions
A historic early-season heat wave is currently impacting the Southwest region of the United States, triggering Extreme Heat Warnings and Advisories for nearly 40 million individuals.
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