The low of 80° at Washington, however, appears to be holding for a new daily high minimum (old record 79° in 1999).
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 RECORDEDAlso, the 7 consecutive hours of 100°+ temperatures tied the previous record:
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
THE MOST NUMBER OF CONSECUTIVE HOURS OF 100F OR BETTER IN WASHINGTONFor Baltimore,
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.
THE EARLIEST REPORTED READING OF 100F IN A CALENDAR DAY WAS RECORDEDHourly temperature records extend back to August 1921 in Washington and August 1927 in Baltimore.
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.
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°.