On the getaway Friday evening of Memorial Day weekend, an urban flood advisory is in effect for southwestern Nassau County but has expired for the rest of Long Island, the National Weather Service said.
Thunderstorms moving at around 15 mph Friday night had dumped heavy rain at rates of up to 1 inch per hour, the weather service said: "This is expected to cause minor flooding of poor drainage and low lying areas."
The advisory is in effect until 10 p.m. for southwestern Nassau.
The weather is otherwise supposed to cooperate for a pretty pleasant Memorial Day weekend.
"By the time we get to Monday, we're going to have a pretty nice day," said Joey Picca, a meteorologist with the National Weather Service's Upton office.
Monday highs could reach near 80 in some parts of Long Island, with clear, sunny skies.
Friday's wet weather was causing arriving flights at LaGuardia Airport to be delayed more than two hours, according to the Federal Aviation Administration.
Departures and arrivals at Kennedy Airport were lasting 15 minutes or less, the FAA said.
Friday night into Saturday, rain remains in the picture, with showers and thunderstorms likely before 4 a.m.
Saturday brings scattered showers, mainly after noon, as the chance of rain during the day falls to 30 percent and then 20 percent Saturday night.
Mostly, temperatures for the two days will be in the mid 60s.
"The trend hasn't changed much," Picca said of the weekend forecast. "Likely some rain on Saturday, and the longer we get into the weekend the better the weather gets."
By Sunday, the rain system moves out and daily temperatures should climb into the low to mid 70s and linger there until midweek.
For this unofficial kickoff to summer, trends are indicating temperatures in the mid 70s to 80 range on Monday for much of the Island and lower 70s for the forks and coast, said David Stark, a meteorologist with the weather service. No rain is expected on Memorial Day.
The state park beaches are ready, and the annual Bethpage Air Show at Jones Beach is set to take flight over the holiday weekend.
Organizers of the two-day Bethpage Air Show at Jones Beach will have their eyes on the skies.
Hopes are for about 150,000 to 200,000 attendees a day, which is "good attendance and not overwhelming," said George Gorman, deputy regional director of state parks.
An estimated 36.1 million Americans, up from last year's 35.5 million, are planning holiday weekend getaways of 50 miles or more from home, according to an annual AAA travel forecast. That's the second-highest volume of travelers since 2000, AAA said.
As for visitors to Long Island, "we have been anticipating an excellent Memorial Day weekend," said R. Moke McGowan, president of the Long Island Convention & Visitors Bureau and Sports Commission.
Despite the harsh winter, "we had no significant erosion to the beaches," which "are in great condition," Gorman said. Robert Moses experienced some erosion that was not significant, and 300,000 cubic yards of sand were placed "on the beach south of the Robert Moses Water Tower for additional protection," he said.
Lifeguards go on duty this weekend at Jones Beach, Robert Moses, Sunken Meadow and Hither Hills.
As for getting there, state Department of Transportation data show that for the past two years Saturday has been the long weekend's heaviest day for traffic to and from Long Island. Last year's eastbound traffic count for the Long Island Expressway, measured near the Nassau-Queens border, was 92,856, with westbound, 90,155. In 2012, the Saturday eastbound count was 98,162, and westbound, 92,818.
The Long Island Rail Road is adding eight eastbound early afternoon trains on four branches Friday, departing Penn Station in the 2:08 to 3:48 p.m. range, the MTA said. On Monday, Memorial Day, trains will operate on a Sunday schedule.
As for air travel, the Port Authority said it's expecting a 3.4 percent increase in this weekend's passengers over last year, with about 728,800 traveling though Kennedy and 345,000 through LaGuardia airports.
With Ellen Yan