Heat wave causes deaths in Baltimore and Philadelphia . The heat is expected to continue through the weekend as temperatures reach 100 degrees Fahrenheit or higher across much of the country. Heat advisories are in effect until Wednesday evening in the Northeast . New York sets up cooling stations , warns not to open fire hydrants without spray caps .
Heat wave causes deaths in Baltimore and Philadelphia . Several cities from Raleigh , North Carolina , to Newark , New Jersey , hit triple digits . Heat advisories are in effect until Wednesday evening in the Northeast . New York sets up cooling stations , warns not to open fire hydrants without spray caps .