Millions of Americans from the Gulf Coast of Texas to California's San Francisco Bay area were warned to curb outdoor activity and stay well-hydrated during a major pre-summer heat wave expected to roast much of the Southwestern U.S.
Forecasters attributed the excessive heat to a strong ridge of atmospheric high pressure parked over the region, with temperatures expected to soar above 100 degrees Fahrenheit across several states.
Phoenix, Arizona's state capital, could see highs reaching 115 degrees Fahrenheit, with the heat wave expected to peak over California's Central Valley before expanding into the Desert Southwest.
Residents were advised to stay in air-conditioned indoor areas, drink plenty of fluids, and check on neighbors and relatives during the heatwave, as widespread temperature records were expected to be tied or broken across the affected areas.
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