A severe summer heatwave, coupled with an ozone high pollution advisory, is expected to impact large parts of Arizona starting Monday and lasting through the weekend.
Authorities have issued strict public safety warnings in response.
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The Grand Canyon region below 4,000 feet is under an Extreme Heat Warning from Monday to Wednesday, with an Extreme Heat Watch extending through Saturday.
Meteorologists predict the warning may be extended.
Regional experts have declared ABC15 Weather Action Days from Tuesday to Thursday to address dangerous atmospheric shifts across the Valley.
An Ozone High Pollution Advisory is set for Tuesday, posing risks to individuals with respiratory conditions.
Elevated ozone levels can trigger asthma attacks, worsen bronchitis or COPD, and weaken the immune system against respiratory infections.
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Health officials advise residents to limit outdoor activities, reduce vehicle use, carpool, use public transit, and refuel vehicles after dark to reduce ozone buildup.
They emphasize taking breaks in air-conditioned spaces and staying hydrated, as heat is the deadliest weather hazard in Arizona.
The high-pressure ridge causing the extreme heat is also pulling moisture into the state, bringing possible spotty showers and thunderstorms to the Mogollon Rim, White Mountains, and southeastern Arizona.
Official weather records at Sky Harbor show a severe rainfall deficit for 2026, with total precipitation at 0.32 inches—2.72 inches below average.
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Monsoon rainfall for 2026 remains at 0.00 inches.
