Weather service: Flash Flood Watch in effect for Nassau County

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A Flash Flood Watch is in effect for all of Nassau County from Thursday night into midday Friday, when Tropical Storm Elsa is predicted to blow across the region, bringing with it high winds and steady rain, according to the National Weather Service.

The NWS is predicting one to three inches of rain, with strong wind gusts possible. The storm is expected to taper off tomorrow afternoon, with a 30 percent chance of rain Saturday evening. 

Below is the NWS's forecast for Long Island's South Shore:

This Afternoon
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a temperature falling to around 76 by 5 p.m. South wind 8 to 16 mph.
 
Tonight
Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 71. Southwest wind 11 to 14 mph, becoming southeast after midnight. Chance of precipitation is 100 percent. New rainfall amounts between 1 and 2 inches possible.
 
Friday
Showers and possibly a thunderstorm, mainly before 2 p.m., then a chance of showers and thunderstorms after 2 p.m. Some of the storms could produce heavy rainfall. High near 83. Breezy, with a north wind 16 to 21 mph, becoming southwest 8 to 13 mph in the afternoon. Chance of precipitation is 100 percent. New rainfall amounts between three quarters and one inch possible.
 
Friday Night
A 30 percent chance of showers, mainly before 8 p.m. Mostly cloudy, with a low around 69. Southwest wind 5 to 9 mph becoming light after midnight.
 
Saturday
Mostly sunny, with a high near 82. North wind 3 to 7 mph.
 
Saturday Night
Mostly cloudy, with a low around 68.
 
Sunday
A chance of showers, with thunderstorms also possible after 2 p.m. Mostly cloudy, with a high near 80. Chance of precipitation is 40 percent.
 
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Chance of precipitation is 50 percent.
 
Monday
A chance of showers, with thunderstorms also possible after 2 p.m. Partly sunny, with a high near 84. Chance of precipitation is 40 percent.
 
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Chance of precipitation is 40 percent.
 
Tuesday
A 30 percent chance of showers. Partly sunny, with a high near 82.
 
Tuesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 70.
 
Wednesday
Partly sunny, with a high near 84.