A supermoon lunar eclipse is set to dazzle stargazers tonight, but expected cloud cover could curtail the show over Long Island.

A lunar eclipse occurs when Earth's shadow falls on the moon, turning its usually silvery surface a dark, coppery red. This happens when the Earth moves between the moon and the sun.

When a new or full moon is at its closest to the Earth, it's dubbed a supermoon. It's rare that both lunar events align.

Unfortunately for Long Islanders, tonight's forecast calls for increasingly cloudy skies. News 12 Long Island meteorologists say there may be breaks in the clouds during the eclipse, so keep your eyes on the skies for a chance to see it.

The partial eclipse will begin at 9:07 p.m. The total eclipse will begin at 10:11 p.m. and will continue to be visible until 11:23 p.m.

The next supermoon eclipse won't come until the year 2033.