Electricity was restored today to more than 13,000 metropolitan area customers whose service was interrupted last night and early today when a thunderstorm downed power lines, a spokesman for the Baltimore Gas and Electric Co. said today.

A utility spokesman said the customers all had their power returned by 7 a.m. Residents in the Marriottsville area of Howard County were the last to have their service restored.

Art Slusark, a BG&E; spokesman, said the storm interrupted power to about 6,000 customers in Baltimore County, 2,900 in Harford County, 1,000 in the city, 600 in Howard and about 500 in Westminster.

He said most outages were caused by tree limbs falling on wires.

In Sudbrook Park, Pikesville, a cable problem at a BG&E; substation was blamed for plunging 1,500 customers there into darkness.

At Cub Hill east of Towson, outages were reported among several large apartment complexes and single-home developments about 9:30 p.m. Power to the Cub Hill customers was restored in a few minutes, Slusark said.

While temperatures yesterday exceeded 90 degrees, they did not set a record, a forecaster said.

"We didn't break a record in the city, but we tied a record at BWI," said Ken Shaver, a forecaster at Baltimore-Washington International Airport.

The temperature in the city soared yesterday to 93 degrees, 2 degrees short of the record set in 1881, Shaver said. At BWI, the high was 91 degrees, tying the record set in 1956.

"It's a little unusual to get this warm this time of year," Shaver said. "Seventy-three to 74 degrees are the normal highs."

Shaver said warm air coming from the Gulf of Mexico triggered the heat, which combined with humidity to provide for an uncomfortable day.

"It was a 3-H day," Shaver said of yesterday's weather: "Hazy, hot and humid."

And the National Weather Service predicted more of the same for today -- hazy sunshine, highs in the mid- to upper 80s, afternoon thunderstorms. Tomorrow is to be slightly cooler.