Slick roadways and high water could snarl traffic Friday as Tropical Storm Andrea works its way through the Washington area.

Latest forecast

Rain that fell overnight created a high water hazard on the outer loop of the Capital Beltway near Eisenhower Avenue in Fairfax County, Virginia. Crews are working to pump the pooling water, but the area could be a problem throughout the day as more rain falls.

On the inner loop, between the exits for Route 355 (Wiscondin Avenue/Rockville Pike) and Connecticut Avenue, an overturned tractor-trailer is creating delays. Authorities said a tow truck was moving the vehicle from the roadway using the shoulder. It is unclear if the accident was weather-related, but authorities urge motorist to use extra caution this morning.

A flash flood watch is in effect for most of the D.C. area. The heaviest rains are expected to arrive in the region between midday and the early evening hours, which could impact the commute, according to the Capital Weather Gang.