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Story summary
- Martinez Lake, Arizona, recorded 110 degrees Fahrenheit, setting a U.S. March record.
- The heat wave spread across the Southwest, with California locations at 108 degrees.
- Phoenix reached 105 degrees, marking the earliest triple-digit day in 40 years, with trails closed due to heat illness risks.
- Las Vegas recorded 95 degrees, surpassing its previous record.
- The National Weather Service forecasts continued above-normal temperatures with a slight decline starting Sunday.
