A Flash flood watch is in effect for Nassau and Suffolk counties through Sunday morning.

Flash flooding is not imminent or guaranteed unless a warning is issued.

Sunday is expected to see a warm and muggy start. Conditions will be mostly cloudy, but News 12 meteorologists say the day will not likely be a washout.

Scattered thunderstorms are possible, with highs in the low-80s.

Wet weather will continue until Wednesday of next week.

Stay with News 12 Long Island for the latest forecast information, and download the News 12 app for weather updates on the go.