CHICAGO (AP) -- A summer thunderstorm that swept over Chicago on Thursday afternoon is bringing only temporary relief from the heat.

Chicago's O'Hare International Airport saw a dramatic temperature swing from a record-breaking 103 degrees at 2 p.m. to 84 degrees by 2:45 p.m.

National Weather Service meteorologist Richard Castro says the Chicago area is headed for another record-breaker on Friday, with 103 degrees predicted for the high.

Rockford and Chicago both broke records for the hottest July 5 that were set in 1911. Chicago's 103 degree temperature on Thursday bested the 1911 record of 102.

Rockford's 101 degree temperature broke the record of 100.

An extreme heat warning is in effect until 10 p.m. Friday.