Endless Summer IX: Day 66 of 90°+ Temperatures; Heat Records Set in 10 States from North Carolina to New Hampshire

5:30 PM Update: The preliminary high temperature at Washington is 99°, 5° above the old record (1970) and 22° above the climatological average. This is 16 days later than the previous latest date with a temperature of 99° or higher (100° on Sept. 8, 1939).

The high of 97° at Dulles also smashes the 1970 record by 5°.

Baltimore's high of 95° ties the record, also from 1970.

Martinsburg WV's high of 95° is 1° below the 1970 record.

Other highs around the region:

Baltimore Downtown 97
Charlottesville VA 97
Hagerstown MD      95 

Other records set or tied (previous in parentheses):

Richmond VA    96 (95,1970)
Norfolk VA     96 (90,1970)
Salisbury MD   95 (91,1930)
Wallops Is. VA 90 (87,2009)
Blacksburg VA  87 (tie,1970)
Beckley WV     86 (85,2007)
Raleigh NC     96 (91,1945)
Greensboro NC  93 (92,1941)
Atlantic Cty NJ 93 (89,1970)
Georgetown DE  97 (95,1970)
Wilmington DE  92 (91,1970)
Mt. Pocono PA  85 (84,1970)
Avoca PA       90 (88,1970)
Binghamton NY  88 (84,1970)
Syracuse NY    90 (88,1970)
Worcester MA   85 (tie,1914)
Concord NH     90 (88,1908)  

5 PM Update: Washington National is still 97°, Dulles is up another degree to 97° also.

4 PM Update: Washington National has backed off to 97°, Dulles is up to 96°. The latest report from both Culpeper VA and College Park MD is 99°.

3 PM Update: Washington National reports a remarkable jump to 98° as the wind has shifted to the southwest. If correct, it would be not only a new daily record (old record 94° in 1970) but also the highest temperature so late in the season. Other stations in the region reporting similarly high temperatures:

Culpeper VA        99
Patuxent River MD  98
Fredericksburg VA  98
Frederick MD       97
Leesburg VA        97
Manassas VA        97
College Park MD    97
Stafford VA        97
Ft. Belvoir VA     97
Andrews AFB        96
Baltimore Downtown 95  

Dulles is up to 95°.

Richmond, Raleigh new records added below.

2 PM Update: The high temperature so far is 93°. Washington Dulles has already broken its daily record with 94°, 2° above the old record set in 1970.

The 96° so far at Richmond has broken its previous record of 95° also set in 1970. Richmond records extend back to 1897.

Raleigh has reached at least 95°. This breaks the 1945 record by 4°, although Raleigh records extend back only to 1944.

Original post:
At 1 pm today, the temperature at Washington reached 91°, bringing the total number of 90° days for 2010 to 66, one short of the record number in 1980.

Richmond (94°) and Raleigh (93°) are continuing to add to their records.

Images (click to enlarge): Washington/Baltimore and Mid Atlantic regional surface temperatures at 4 pm EDT, September 24, 2010, from MesoWest; Cumulative annual number of days with temperatures 90° or higher in Washington, CapitalClimate chart from National Weather Service data