Heat wave causes deaths in Baltimore and Philadelphia . Heinrich said the waterpark is reminding visitors via its loudspeakers to drink fluids -- and making it easier for them to do so . Several cities from the American Society for the Prevention of Cruelty to Animals , North Carolina , to North Carolina , Philadelphia , hit triple digits . Heat advisories are in effect until afternoon in the Northeast . Philadelphia sets up cooling stations , warns not to open fire hydrants without spray caps .
Heat wave causes deaths in Baltimore and Philadelphia . Several cities from the American Society for the Prevention of Cruelty to Animals , North Carolina , to North Carolina , Philadelphia , hit triple digits . Heat advisories are in effect until afternoon in the Northeast . Philadelphia sets up cooling stations , warns not to open fire hydrants without spray caps .