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A coastal flood advisory is also in place for 8 p.m. Wednesday until 2 a.m. Thursday for areas along the shoreline of Long Island Sound during high tide, the Weather Service said.
"A tropical mass is likely to move into the area and bring some tropical downpours" by Wednesday evening, said Gary Lessor, assistant to the director of the meteorological studies and the Weather Center at Western Connecticut State University in Danbury. "It looks like substantial rainfall is likely. ... Looking at radar, it looks like it's coming."
The system dropping the heavy rain "is the northern edge of the system that brought the deadly tornadoes to the Mississippi Valley," Lessor said.
The tide could be 1 to 1.5 feet above high tide, with minor beach erosion possible. Widespread minor flooding is possible due to onshore winds, rain and high tides.
As heavy rains and strong winds buffeted Fairfield County, a flood watch went into effect at 2 p.m. Wednesday for coastal areas, the National Weather Service said.
The Flood Watch will remain in effect as "rain with an approaching frontal system should become heavy by late day Wednesday," according to the National Weather Service.
"Flooding of urban, low-lying and poor drainage areas is possible as early as the Wednesday evening rush hour, with one to 2 inches of rain expected by that time," the National Weather Service said. "As the heavy rain continues Wednesday night, storm total rainfall will increase to 2.5 to 3.5 inches with locally higher amounts, increasing the threat of widespread, significant urban, low-lying and poor drainage flooding, as well as flooding of small streams and rivers."
Rain will become heavier into Wednesday evening, with high temperatures reaching only the mid-40s, where they should stay overnight.
The latest front is expected to clear from the area overnight on Thursday, but a chance of rain continues through the weekend.
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