Parts of Arizona, Texas and South Florida are forecast to see dangerous temperatures again after a weekend of extreme heat. Forecasters warn against spending time outdoors.
Heavy rain spawned extreme flooding in New York's Hudson Valley that killed at least one person and forced road closures as much of the rest of the Northeast U.S. began bracing for heavy rainfall.
The National Weather Service has warned people in several cities, including Phoenix and Miami, to avoid the sun over the coming days as temperatures climb to life-threatening numbers.
Dangerous heat and elevated risks of wildfires are present in parts of the West, with climate change and El Niño both playing a role. Meanwhile, thunderstorms threaten the Midwest and the East Coast.
The National Weather Service warned flooding could be "life-threatening," with numerous impassable roads, overflowing creeks and streams and flooded basements across the Chicago area.
In Madison, Wis., the air quality was measured at 242 Thursday morning— a "very unhealthy" purple alert rating that many other communities shared, particularly in the Midwest.
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