Tomorrow should be wonderfully comfortable once again, and we strongly advise everyone to savor it, or bottle it if possible.
The heat is coming on sooner than expected, and evidently will be more intense than foreseen earlier.
The National Weather Service has seen enough to post an "excessive heat watch" for the period from Friday afternoon through Sunday night, with the potential for 100 degree heat-index readings.
Thursday's forecast high has been bumped up to 92, and it appears that the second heat wave of the season is going to be longer -- perhaps twice as long -- as the first.
The forecasts highs for Friday, Saturday, and Sunday are all in the 95 range, with temperatures failing to get below 70 in Philly at least through Tuesday morning.
The weather service says that a stalled frontal boundary during the weekend might set off a few showers, however those would be isolated.