As Hurricane Irene brought increasingly heavy rains to the Baltimore region, accumulating water prompted road closures and detours.

The National Weather Service office in Sterling, Va., had extended a flash-flood warning for southeastern Howard County, southeastern Montgomery County, Northcentral Anne Arundel County and Northern Prince George's County, southeastern Baltimore County, parts of Harford County and the city of Baltimore until 3:15 a.m. Sunday morning.

The conditions also increased the uncertainty that the Maryland Transit Administration would be able to resume local bus and Metro service by 6 a.m., said MTA spokesman Terry Owens. The Light Rail's schedule normally begins at 11 a.m. Sundays, and officials hope to be able to start service then as usual.

However, "much will depend on what we find when we wake up in the morning," Owens said.

Riders were encouraged to call the information line 410-539-5000 or to check mtamaryland.com before venturing out for the latest updates.

The following roads were reported closed Saturday night due to standing water:

Smith Avenue and Kelly Avenue in Baltimore;

Harford Road and Gorsuch Avenue in Baltimore;

Golden Ring Road at North Point Boulevard in Dundalk;

Old Battle Grove Road in Dundalk;

Dorsey Road between Central Avenue and Baltimore-Annapolis Boulevard in Glen Burnie;

Mountain Road and Blue Waters Farm Lane in Pasadena;

Route 450 (Defense Highway) at Rutland Road west of Annapolis;

Central Ave and Mayo Road in Londontowne;

Solomons Island Road and Central Avenue in Londontowne;

The following bridges were closed because of high winds spawned by the hurricane:

Chesapeake Bay Bridge;

Route 450 bridge over the Severn River;

Nice Bridge.

The State Highway Administration is also keeping a list on its website of traffic signals that have been knocked out.

If you see high water in your community, email us about it at newstips@baltimoresun.com.