The cold front that delivered rain, including scattered thunderstorms, to most of Long Island early Monday is expected to leave behind at least three days of clear, sunny weather, the National Weather Service said.
The Upton-based service said a Canadian high-pressure system is trailing the cold front, meaning mostly clear weather and temperature highs in low 70s through Thursday.
Morning commuters awakened to rain, heavy in spots, and a flood advisory was issued for most of Nassau and western Suffolk counties until 9:30 a.m., the service said.
The rain is expected to linger in spots until about 10 p.m., with total rainfall amounts ranging from three-quarters of an inch to slightly more than an inch. The heavier amounts are expected for central Suffolk and the East End.
The flood advisory warned of flooding, "particularly across coastal sections," the weather service said in hazardous weather outlook.
The weather, especially low visibility, was causing some arriving flights at LaGuardia Airport to be delayed nearly 90 minutes, the Federal Aviation Administration said.
At Kennedy and Long Island MacArthur airports, general arrival and departure delays related to the weather were 15 minutes or less.