Nassau County crews and first responders are on standby, and the Office of Emergency Management will be activated later today in preparation for a storm expected to bring heavy downpours and damaging winds to Long Island today.

The National Weather Service has issued a flood watch, coastal flood warning and high wind warning for Nassau County. The watch and warnings are in effect from Tuesday evening through Wednesday.

Storm Watch Team Meteorologist Rich Hoffman says the strong storm will bring heavy rain, damaging winds and coastal flooding this afternoon into Wednesday morning to Long Island.

MORE WEATHER: Latest forecast information from Storm Watch Team meteorologists

Nassau County Executive Bruce Blakeman is urging everyone to stay prepared.

"Make sure you have plenty of water. Charge the batteries in your phone and your iPad. Keep a flashlight. If you need to use candles during the day, make sure they are extinguished if you leave the house," Blakeman said.