The National Weather Service's excessive heat advisory has been extended until 8 p.m. tonight after several days of record high temperatures and the death of a 67-year-old Germantown man that waspartially heat-related.

The incident marks the 5th heat-related death in Philadelphia this summer so far.

Philadelphia's Department of Public Health advises residents to stay hydrated, rest often, remain indoors between 10 a.m. and 2 p.m. and use a fan or air conditioner. If cooling devices are unavailable, visit a shopping mall, library or friend that has air conditioning.

The city also urges residents to check on elderly neighbors. Serious signs of heat stroke include

rapid heartbeat, muscle cramps, confusion or anger and respiratory problems. If these symptoms are present, call 911.