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Heavy rain expected on Long Island on Saturday night into Sunday, with flood watch in effect for Nassau

This NOAA satellite image taken Saturday, June 20,

This NOAA satellite image taken Saturday, June 20, 2015, at 12:45 a.m. shows tropical depression Bill over the Tennessee Valley moving into the Ohio River Valley. Credit: AP

Tropical depression Bill may be the unwanted guest for Father's Day brunch.

Mother Nature is throwing Long Island dads a curveball and forcing families to rethink their outdoor plans as heavy rain is expected to start around midnight Saturday across Long Island and last through the early afternoon.

A flood watch is in effect for western Suffolk County from 2 a.m. Sunday through early Sunday evening.

Most parts of northwestern and southwestern Suffolk County are expected to see about 1 to 2 inches of rain, with a third inch possible during a heavier downpour and chances of flash flooding.

"A lot of rain in a short period of time could lead to localized flooding on area roads," said News 12 Long Island meteorologist Samantha Augeri. "Late tomorrow morning into the afternoon, we dry out pretty quickly with sunshine and warmer temperatures."

A cold front will pass by the region Sunday evening with another spot shower or storm possible, Augeri said.

Summer officially begins at 12:38 p.m. Sunday, but sunshine might be scarce. Temperatures are still expected to reach 81 degrees in the warm, humid rain.

Winds are expected to pick up to 14 mph in the afternoon with showers and thunderstorms lingering into the evening.

Monday may dry out from the storm with high temperatures in the mid-80s. Additional showers are possible on Tuesday and Thursday.

The region is in need of showers to keep up with annual rain totals and avoid moderate drought. The storm's arrival may cure rainfall totals, which are about .55 inches below normal this time of year, as measured in Central Islip.

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