A dangerous heat wave continues to scorch a large part of the United States, with more than 130 million people under extreme heat watches and warnings from South Dakota to Florida as temperatures in some cities are expected to exceed 100 degrees,

We're in the middle of summer, and that means thermometers are working overtime around the country. It's normal to be warm everywhere this time of the year, but some portions of the United States are experiencing extreme heat.

Extreme heat and humidity are expected to hammer the New York City area to start the week. We could see our second heat wave of the season, with three consecutive days above 90 degrees.CBS News New York's First Alert Weather team has issued a string of First Alert Weather Days due to the threat of intense heat.