Austin Brodmerkel and Theresa Travers, both of West Islip, paddle their...

Austin Brodmerkel and Theresa Travers, both of West Islip, paddle their way through the waters of Stony Brook Harbor on Monday. Tuesday's forecast calls for more nice weather with clear skies and highs in the low-80s. Credit: Newsday/Thomas A. Ferrara

The weather service has issued a small craft advisory from midday Tuesday through Wednesday morning because of conditions that could be hazardous to small crafts.

The forecast for Long Island on Tuesday calls for clear skies and high temperatures in the low-80s, according to the National Weather Service in Upton.

But for the Atlantic Ocean waters from Sandy Hook, N.J., to Montauk Point, northeast winds of nearly 25 mph. and waves of up to six feet expected.

The advisory is in effect from 2 p.m. Tuesday until 8 a.m. Wednesday.

"Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions," the advisory stated.

Mostly sunny skies and moderate temperatures are in store for Long Island this week, according to the forecast from the weather service.

Though there’s a slight chance of showers Wednesday, forecasters are calling for a lot of sun with temperatures in the low 80s to begin the week — and sunny skies and temperatures into the mid-80s to end it.

The additional good news for the week is that the chance of showers Wednesday is just 20%.

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