On an afternoon more typical of July in northern Arizona, the official temperature in Philadelphia is challenging a record for the second consecutive day.
At 3 p.m., the thermometer at the airport was reading 89.1 degrees, or 0.9 degrees shy of the all-time high set in 1929. Yesterday's high, 87, tied the record for the date.
And that air out there is bone dry. The relative humidity at 3 was a very un-Philadelphia-like 20 percent -- about what it was at Grand Canyon, Ariz.
The dry air plus brisk southwest winds moved the National Weather Service to post a "red flag" alert for fire danger. The weather service warned that any brush fire could spread in a hurry under these conditions.