Isolated thunderstorms are possible Wednesday afternoon — mostly in western areas including Nassau — and could bring up to three quarters of an inch of rain in poor drainage areas, forecasters said.

“Most of it [the thunderstorms] will probably be in the western areas — Nassau and Queens,” Jay Engle, a meteorologist with the National Weather Service’s Upton office, said shortly before 1 p.m. “The chances decrease as you go east and into Suffolk.”

Engle said that at least a half inch of rain could fall in affected areas.

Thunderstorms were causing flight delays at both Kennedy and LaGuardia airports Wednesday afternoon, according to the Federal Aviation Administration website, which urged travelers to check with their airlines about specific flights.

News 12 Long Island meteorologist Matt Hammer also said isolated showers are possible and added that any storms will be “few and far between” in the afternoon or early evening.

Daytime high temperatures on this partly sunny Wednesday and through the rest of the week should be in the low to mid-80s, according to the weather service.

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The nighttime low Wednesday will be near 70, and in the low to mid-60s for the rest of the week, the weather service said.

With William Murphy