Temperatures at 2 p.m. Tuesday. (Weather.com)

(This post, originally published Tuesday afternoon, was updated Wednesday morning.)

It’s not all that common but the hottest weather in the nation lined up along the Interstate 95 corridor from the District to Boston on Tuesday afternoon. More than 15 locations set record highs.

The region’s temperatures were hotter than those in the desert Southwest as well as the Southeastern United States. Only parts of the Southern Plains could match its heat.

Temperatures into the mid-90s were widespread. Factor in the humidity, and it felt more like 95 to 100.

HRRR model forecast of heat index at 4 p.m. Tuesday.

It was the third-straight day with temperatures of at least 90 degrees in the Northeast, which officially met the criteria of a heat wave.

In Boston, the heat wave was the second of the year, the earliest on record that the city posted two such events.

To the south, the District’s temperature soared to 95 degrees, one degree off the record high of 96 for the date, set in 1954.

Dulles International Airport climbed to 95 degrees, breaking the previous record of 94 set in 1994.

Baltimore soared to 97 degrees, tying the record set in 1956.

In addition to Dulles and Baltimore, more than a dozen additional locations in the Northeast set daily high temperature records Tuesday:

Tuesday marked the second straight day of record-challenging heat.

On Monday, the District hit 95, tying the previous daily record set in 2002, 1986, 1942, 1938, 1914  and 1880.

Other cities that set record highs Monday included Atlantic City, Allentown, Providence  and Worcester.

The District’s temperature, both Sunday and Monday, was hotter than Death Valley, Calif. — often the nation’s hot spot.

Tuesday was expected to be the last day of record heat in the Northeast as a backdoor cold front slipped southward Wednesday.

GFS forecast of temperature change between 5 p.m. Tuesday and 5 p.m. Wednesday.

The forecast high temperature in Boston on Wednesday is just 73 degrees, some 20 degrees cooler than Tuesday.

During a heat wave the body has to work harder to maintain a normal body temperature. Here are five facts to keep in mind when dealing with intense heat. (Claritza Jimenez/The Washington Post)