Transcript for Sizzling Temperatures Spark Heat Warnings
We'll turn now to the dangerous heat moving in tonight. 30 million Americans, 16 states already under heat advisories and warnings and with the humidity factored in, the heat index hitting triple digits from Texas all the way up to philly, New York, and Boston. Ginger, you were saying the real concern is that the heat will last for days. Right. We talk about the cumulative effect of heat on people's bodies and the heat is not going anywhere overnight. The heat advisories, the current heat index, way above 110 for St. Louis. Memphis is going to stay in excess ef heat warning on our Wednesday. Tomorrow, the Numbers are in the 90s all the way up the east coast. Boston, you'll hover around 90 degrees, it will come from Tallahassee. Heat and humidity ahead of the storms, but storms possible from Des Moines to Cedar Rapids. And finally that ridge of high pressure out west, a huge concern. Sacramento, 107. It's dry, hot and windy, terrible for fires. And we'll get more on that
This transcript has been automatically generated and may not be 100% accurate.