HOUSTON (AP) — Sweltering heat more commonly seen in the throes of summer than in the spring was making an unwelcome visit this week to a large portion of the U.S. – from the Dakotas to Texas and other parts of the South – and putting millions of Americans on alert for potentially dangerous temperatures.

In Austin, forecasters warned that the early heat wave could break a century-old record for May of 104 degrees Fahrenheit (40 degrees Celsius).

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