PHILADELPHIA — With temperatures forecast to head deep into the 90s for the next several days and with a heat advisory in effect through Sunday — when it might hit 100 — Philadelphia has declared its first “heat health emergency” of the season. The Public Health Department announced the emergency declaration would be in effect from noon to 8 p.m. Thursday but could be extended if conditions warrant during what might become the region’s longest heat wave in nine years. By 9 a.m. Thursday the heat index already had crept up to 95 on what the National Weather Service says is going to be the most-…
