Button up. The forecast calls for near-record cold tonight, with lows in the mid-20s, and continued cold through Saturday.

Yesterday's high of 42 degrees at Baltimore-Washington International Airport was the coldest maximum temperature ever for a Nov. 4. The reading, taken just after midnight, broke the old record of 48 degrees, set in 1966 and 1983.

The overnight low today was 26 degrees at BWI, reached at 4:25 a.m. That was 1 degree colder than the old record set in 1952.