UPDATE, 3:45 p.m.: The mercury touched 99 at 2:34 p.m. according to observers at Reagan National Airport, breaking the record for the date.
From 1:40 p.m.: At 12:49 p.m., Reagan National Airport (DCA) - the official observing location for Washington, D.C. - sizzled to 98 degrees, tying the record high for June 21, shared with 1998 (and some previous years).
This morning’s low at DCA of 78 is also likely set a record for warmest minimum temperature (unless it drops below that prior to midnight). The previous record was 76 set in 2010.
Washington, D.C. remains among the top destinations for hot temperatures along the East Coast and for the whole country when you factor in humidity.
As I discussed yesterday, the mid-Atlantic and Northeast coincide with the center of an area of high pressure at upper levels - compressing and heating the air. Lower down in the atmosphere, high pressure is situated to the southeast, circulating humid air from the Atlantic and Gulf of Mexico in a clockwise loop passing over this same region.
So far today, here are records that have been tied/broken in the East:
Boston: 96 (previous record 95, 1949)
Nantucket: 92 (previous record 84), also new monthly record!
New York City (JFK): 96
Hartford: 96 (tie with 1953)
Burlington: 97 (previous record 95, 1953)
A number of cities, primarily in the Northeast and New England set record highs Wednesday, including:
New York City (JFK): 94 (previous record 93, 1995)
New York City (LaGuardia): 98 (previous record 96, 1953)
Newark: 98 (previous record 97, 1953)
Hartford: 97 (previous record 96, 1995)
Burlington: 95 (previous record 94)