Forecast high temperatures Wednesday through Friday by National Weather Service (WeatherBell.com)

The entire eastern half of the U.S. is awash in warm air. In some areas, temperatures have reached their highest levels in early November in decades.

An amazing 40 percent of the Lower 48 is forecast to be at least 70 degrees today.

Over the next four days, this spell of Indian summer will erode from west to east, but not before a number of high temperature records fall.

Record highs near eastern Great Lakes today


Wednesday’s forecast highs. Locations where forecast is within one degree of a record are circled. (WeatherBell.com)

Parts of the Great Lakes and Ohio Valley will experience the biggest temperature differences from normal today and locations like Buffalo and Detroit are forecast to close in on high temperature records.

Even a bit farther west, locations like Chicago and Madison will approach records:

In Minneapolis, the mercury has a chance to reach 70 for the third straight day for the first time in November since 1975.

More warmth on Thursday, but shy of records in most spots

Warm weather persists Thursday in many of the same areas as Wednesday, but few records are forecast as somewhat pervasive cloud cover shaves a few degrees off forecast highs in many areas.


Forecast cloud cover Thursday afternoon (WeatherBell.com)

Unusually hot in Florida

Much of the Florida peninsula is forecast to have highs in the mid-to-upper 80s through Saturday, which will challenge records in quite a few areas.


Friday’s forecast highs. Locations where forecast is within one degree of a record are circled. (WeatherBell.com)

Record highs eye D.C., I-95 corridor Friday


Wednesday’s forecast highs. Locations where forecast is within one degree of a record are circled. (WeatherBell.com)

Washington, D.C., Baltimore, New York, Providence, and Boston are all forecast to flirt with record highs on Friday.

In D.C. and Baltimore, forecast highs are near 80 degrees, whereas records at the three local airports, Reagan National, Dulles, and BWI are 78, 78, and 77.

Capital Weather Gang’s Ian Livingston points out 2003 was the last time D.C. hit at least 80 in November.

By Saturday and especially Sunday, temperatures over much of the eastern U.S. will have returned to near normal – even in the Sunshine State.