It’s going to be soggy and scorching in the U.S.

California’s extreme heat is expected to break Saturday

CNN News Wire | 7/5/2013, 12:02 p.m.
There are two words that summarize the July Fourth holiday that was and the weekend ahead: hot and soggy.
NOAA GOES 13 satellite captures a view of the eastern half of the U.S at 9:31AM ET on Friday, July 5, 2013. The National Weather Service forecasts a persistent flow of tropical moisture will bring showers and thunderstorms across the Southeast and into the Tennessee and Ohio Valleys on Friday and into the weekend. Some of the showers and thunderstorms will be capable of producing heavy rain, bringing a threat of flash flooding. Meanwhile, the excessive heave wave in the West will continue to shrink. NOAA NASA GOES Project

On Thursday, the heat caused 120 people to receive medical evaluations at Independence Day celebrations on the city’s Esplanade, said Jim Hooley, chief of Boston Emergency Medical Services. Four people were taken to a local hospital as a precaution, he said. Temperatures along the Charles River reached into the 90s on the holiday.

In light of the terror bombings at the Boston Marathon in April, security was very tight for the July Fourth events.

“I think it’s going very well, for the most part,” State Police Col. Timothy Alben told the The Boston Globe. “The public has cooperated tremendously. There are always going to be some people who don’t like [tight security]. We understand that. But I think it’s the world we live in.”

Feeling hot in Philadelphia and New York City

Meanwhile on Friday, the heat continued to oppress Philadelphia. The city was under an excessive heat watch, with temperatures expected in the lower to middle 90s, Lefevre said.

And New York City will be a steamer. A heat advisory remains in effect until 8 p.m. Sunday for all five boroughs. Temperatures are expected in the lower to middle 90s, the National Weather Service shows.

Cooling centers will be open Friday through Sunday throughout the city, New York City Office of Management spokesman Nancy Greco said. Public areas with air conditioning, such as senior centers and libraries, will house cooling centers for those who don’t have air-conditioned homes, she said.

New Yorkers can call 311 or go online to find a center near them.

CNN’s Morgan Winsor and Gabrielle Rodman contributed to this report.

Ashley Fantz | CNN