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City-employed crews removed debris from roadways, directed motorists at nonfunctioning traffic lights and cleared downed trees.

D.C. Mayor Vincent C. Gray monitored the situation during his flight back from China, where he spent the past week on business, his spokesman said. A joint emergency command continued to direct recovery efforts from the D.C. Homeland Security and Emergency Management Agency’s Southeast headquarters throughout the weekend.

Meanwhile, the D.C. government advertised cooling centers through the city for people without power, including five libraries in select locations around the city, six recreation centers and three churches that volunteered to take in residents.

The District Department of Transportation reported that 69 trees had fallen on public space, although not in roadways. Nearly half of them, or 31, were in Ward 3, officials said.

According to the National Weather Service, Monday temperatures are expected to be slightly cooler, with highs in the low 90s.

Matthew Cella, Tom Howell Jr. and Megan Poinski contributed to this report.