A weak tornado was spotted near Mattituck Wednesday afternoon, meteorologists said.

“Based on a survey conducted by [the National Weather Service], NWS Doppler weather radar data, emergency management, and trained Skywarn spotters, the . . . service confirmed a weak EF0 tornado in Mattituck at 4:25 p.m. EDT this afternoon,” the service said.

“As a severe thunderstorm moved southeast across eastern Suffolk County, it produced a small weak short-lived tornado in Mattituck. Most wind damage was concentrated between Main Road and New Suffolk Avenue close to the corridor from Cardinal Drive southeast to Blossom Bend, where the tornado lifted before reaching New Suffolk Avenue. Wind damage was confined mainly to trees, where several trees were snapped in half,” the service said.

Unsettled weather continued in Long Island throughout the afternoon and evening Wednesday.

A flash flood warning had been issued for eastern Suffolk County, lasting through 7 p.m. Wednesday, as Doppler radar “indicated thunderstorms producing heavy rain moving onto the North Fork and moving southeast,” the National Weather Service said.

More rain is possible Wednesday night, and the heat and humidity return Thursday, along with potential spotty storms, forecasters said.

Thursday’s temperatures on Long Island are expected mostly to reach the upper 80s, flirting with 90, but feeling more like the mid-90s, thanks to the humidity, forecasters say.

Thursday and Thursday night bring around a 20 percent chance for isolated showers and thunderstorms, some of which could result in heavy rainfall.

This “warm and humid air mass” is expected to stay in place into the weekend.

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A heat advisory is in effect through 8 p.m. Saturday for New York City, with Friday and Saturday “feels like” temperatures possibly reaching 105 degrees, the weather service says.

On Long Island, temperatures will be about five to eight degrees above normal going into the weekend, said News 12 meteorologist Rich Hoffman.

There will be an “on and off rain threat going into the weekend and it will be very humid, with a tropical air mass over the Northeast.”