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Early Season Heatwave Grips The Southwest,West

April 11,2025

An unusually strong upper-level ridge is allowing a springtime heat dome to settle over the Southwest and stretch into the Rockies—bringing summerlike temperatures well ahead of schedule. Dozens of April daily high temperature records are at risk this week,from Tucson,Arizona,to Billings,Montana. Triple-digit heat is possible across parts of the Southwest,including Phoenix and Palm Springs. Overnight lows will offer little cooling relief in the desert,though mornings will be notably cooler across higher elevations in the Rockies.

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