After a month of bringing blistering heat to the Southwest, the southern Plains and the Gulf Coast, the relentless "heat dome" that has caused an outbreak of extreme temperatures is about to expand across even more of the country.
The heat over the coming week won't be as intense as it was in the Southwest last week, but will cover a lot more territory. In other words, on balance, this will be the hottest week of the year so far for the Lower 48.
The heat is forecast to be most pervasive on Wednesday and Thursday, when more than 250 million people in the United States will experience heat indexes — a measure of how hot it feels, factoring in humidity — over 90 degrees. Temperatures are predicted to be above normal in all regions but the Pacific Northwest.
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