A cold front due to bring steady rain to Long Island has been slow in coming, making for a drier-than-expected Friday evening commute, forecasters said.
A "broad area of precipitation" should hit Nassau in the 8 p.m. to 9 p.m. range, later in Suffolk County, National Weather Service meteorologist Adrienne Leptich said.
Showers, including stretches of downpours, and potential flooding, were expected for Long Island into Saturday morning, forecasters said.
The Upton office said rain will linger over Nassau and Suffolk counties, with up to 11/2 inches possible in some spots.
A flash flood watch is in effect until 6 a.m. for Nassau County's north and south shores, the weather service said.
Add to that the possibility for minor coastal flooding Friday night in spots on the South Shore of Nassau and western Suffolk, the service said. That's due to the convergence of southerly winds, heavier rainfall and high astronomical tide, the service said.
An incoming cold front extending from the Great Lakes to the Gulf Coast states will slowly pass through Friday night and moves out of the area by Saturday.
Southeast winds Friday from 18 mph to between 28 and 35 mph also will be an issue, the service said.
Skies should clear after noon Saturday, with highs in the low 70s and west winds 8 to 11 mph.
There's a small chance for showers Saturday night, but Sunday is mostly sunny, with highs in the low 70s and winds from the northwest at about 10 mph.