After some nice sunshine on the first day of summer, later Wednesday afternoon is bringing a 30 to 40 percent chance for scattered showers and thunderstorms, forecasters say.

Shortly past 5 p.m., a thunderstorm was cruising along the North Shore of Nassau County, “inching into northwest Suffolk,” said Jay Engle, weather service meteorologist based in Upton. The weather service issued a notice saying there’s a possibility that northern Nassau and western Suffolk could see winds of more than 30 mph, along with brief but heavy rain.

Storms that do materialize could bring isolated but damaging winds, along with the potential for a heavy downpour, said Carlie Buccola, National Weather Service meteorologist based in Upton.

More of the pop-up variety, as opposed to widespread, the showers and storms can be expected from around 5 to 8 p.m., she said.

Wednesday also brings a high risk of rip currents through the evening hours at ocean beaches along the Suffolk coast, the weather service said.

Gusty offshore winds and rough seas prompted a small craft advisory for Long Island waters.

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The advisory is in effect until 2 a.m. Thursday from the Fire Island Inlet to Montauk Point, and from noon to 8 p.m. Wednesday for Long Island Sound and the southern bays.

Thursday should be mostly sunny and Friday should be sunny with a chance of afternoon showers and thunderstorms, the weather service said. The high temperature both days will be in the low 80s, the weather service said.