Washington Record Set For Earliest Time of 100° Temperature; Philadelphia All-Time Highest Minimum Nearly Falls

Midnight Update: Several hours of easterly winds have helped lower the Philadelphia temperature to 80° at midnight. The record does not fall.

The low of 80° at Washington, however, appears to be holding for a new daily high minimum (old record 79° in 1999).

Original Post:
The National Weather Service has reported that the observation of a 100° temperature in Washington before noon daylight time yesterday was the earliest ever recorded by time of day for reaching triple digits:

THE EARLIEST REPORTED READING OF 100F IN A CALENDAR DAY WAS RECORDED
YESTERDAY JULY 6 2010...JUST BEFORE 12 PM NOON EDT...OR 11 AM IN
EASTERN STANDARD TIME...EST. PREVIOUSLY THE EARLIEST RECORD OF A
100F READING IN WASHINGTON DC WAS AUG 21 1930 AT NOON EST...OR 1 PM
EDT. 

Also, the 7 consecutive hours of 100°+ temperatures tied the previous record:

THE MOST NUMBER OF CONSECUTIVE HOURS OF 100F OR BETTER IN WASHINGTON
IS 7 HOURS. THIS HAS OCCURRED TWICE...ONCE ON JULY 21 1930 FROM NOON
TO 6PM EST...OR 1 TO 7 PM EDT. THE OTHER WAS YESTERDAY JULY 6 2010
FROM NOON TO 6 PM EDT. 

For Baltimore,

THE EARLIEST REPORTED READING OF 100F IN A CALENDAR DAY WAS RECORDED
ON JULY 10 1936...AT 10 AM EST...OR 11 AM EDT. PREVIOUSLY THE
EARLIEST RECORD OF A 100F READING IN BALTIMORE MD WAS AUG 21 1930 AT
NOON EST...OR 1 PM EDT.

THE MOST NUMBER OF CONSECUTIVE HOURS OF 100F OR BETTER IN BALTIMORE
IS 9 HOURS...ON JULY 10 1936 FROM 10 AM TO 6 PM EST. YESTERDAY...
JULY 6 2010...THERE WERE 7 CONSECUTIVE HOURS OF 100F OR BETTER AT
BWI AIRPORT FROM 1 PM THROUGH 7 PM EDT. 

Hourly temperature records extend back to August 1921 in Washington and August 1927 in Baltimore.

Another all-time record poised to fall in this heat wave is the highest minimum temperature at Philadelphia. With only 3 hours left to go, the morning low of 83° is still above the previous record of 82° last hit on Aug. 8, 2001. The 10 pm temperature at Philadelphia is 86°.