An empty Jones Beach after the Air Show rehearsal was...

An empty Jones Beach after the Air Show rehearsal was cancelled do to heavy fog and poor weather conditions. (May 25, 2012) Credit: Newsday/J. Conrad Williams, Jr.

Areas of dense fog and heavy rain created some travel delays Friday, the kickoff to the Memorial Day weekend and the unofficial start of summer.

The day started with "very dense fog" and visibility of less than a quarter of mile, said Tim Morrin, meteorologist with the National Weather Service in Upton. Expect the cloud ceiling to start breaking up and improved visibility to about six or seven miles, though the day will remain mostly cloudy, he said.

The service is also predicting a slight chance of showers and thunderstorms for Friday afternoon.

The Federal Aviation Administration warned that the weather was impacting holiday-weekend getaway air travel in the metropolitan area.

At about 4:30 p.m. Friday the FAA was reporting average delayed arrivals of one hour and 12 minutes, at LaGuardia Airport; one hour and 58 minutes, at Newark; and 51 minutes at Kennedy.

Flights to Newark from Kennedy, LaGuardia and Long Island MacArthur airports were facing that average hour- and-58-minute delay, according to the FAA.