Drenching rains and potent winds are bringing a dramatic end to the heat wave, with the National Weather Service warning of the potential for flooding and gusts to 60 m.p.h. on the final day of the Democratic National Convention.

A severe thunderstorm watch is in effect for the region until mindnight, as was a flood advisory. A flash flood watch begins at 6 p.m.

A severe thunderstorm warning was issued earlier for parts of Chester County, and later for Philadelphia, as a strong storm with damaging winds hammered the area. Thunderstorm wind damage was reported in Embreeville and West Bradford Township, the National Weather Service said.

The National Weather Service says up to 3 inches of rain could fall Thursday and Friday.

At 1 p.m., the official temperature reached 91 degrees at Philadelphia International Airport, making this the sixth day -- and evidently final -- of the heat wave.

Chances of thunderstorms and rain are in the forecast through Sunday, but high temperatures will fall to the mid 80s.

The threat of rain forced Hillary Clinton's campaign to move a rally planned for lunchtime Friday from Independence Mall to an indoor setting at Temple University.