A severe thunderstorm watch remains in effect for Suffolk County through 10 p.m., with the severe watch for Nassau canceled, the National Weather Service said, as a line of showers and thunderstorms moves from west to east across the area.
It looks to be "a quick-hitting event," dropping from one-half to three-quarters of an inch of rain on western Nassau and around one-quarter of an inch closer to the East End, with the possibility of heavier localized rainfall, said the weather service and David Stark, meteorologist in the Upton office.
The watch indicates that "the potential exists for the development of thunderstorms, which may produce large hail or damaging winds," according to the weather service.
A severe thunderstorm warning for Nassau and Suffolk counties expired at 5:30 p.m. The warning was issued as radar indicated a line of severe storms capable of producing winds of more than 60 mph, the National Weather Service said.
The line of storms, moving northeast at 50 mph, extended from Centerport to Plainview to Long Beach, with another line going from Huntington to Plainview to Long Beach, the service says.
Also expired is a special weather statement issued for Nassau County and Western Suffolk, reporting that, at 4:26 p.m., radar was tracking strong thunderstorms expected to impact parts of the area, the National Weather Service said.
The storms, which were capable of bringing gusting winds up to 50 mph, were spotted along a line that went through Great Neck and Kennedy Airport and were moving northeast at 55 mph, the weather service said.
People in those areas were advised to monitor the weather and listen for possible warnings.
Behind the storms is a cold front, he said, bringing less humidity and highs of 66 to 68 Tuesday into Wednesday: "much nicer fall-like weather," he said.
Some flight arrivals at LaGuardia Airport were being delayed an average of just over two hours, with some arrivals delayed around an hour and three-quarters at Kennedy Airport, according to the website of the Federal Aviation Administration.
Some departures there and from Long Island MacArthur Airport, Ronkonkoma, were affected, and the FAA advised travelers to check with their airlines.