The National Weather Service has issued a flood watch that covers all of New Haven County and Middlesex counties.
Some 2 to 4 inches of heavy rain is expected overnight, with locally higher amounts possible in some areas during the storm, the NWS reports.
This will "likely cause flooding of urban, low-lying and poor drainage areas, and flooding of small streams and rivers," the meteorologists warn in their report.
Coastal Flood Advisory
In addition, a coastal flood advisory has also been issued for southern New Haven County.
Tidal departures are expected to be about 1 to 2 feet above normal.
The overnight high tide at New Haven's harbor is expected to peak at 12:18 a.m.
The rain clouds will continue to hover over the region through to Thursday. But sunnier skies and warmer temperatures are on tap for this weekend.
Here's the NWS's forecast for the rest of the week:
- Wednesday - Showers. High near 50. East wind 14 to 16 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.
- Wednesday Night - Showers, with thunderstorms also possible after midnight. Some of the storms could produce heavy rainfall. Patchy fog after midnight. Temperature rising to around 52 by 4am. East wind 15 to 17 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
- Thursday - Showers, mainly before 2pm. Patchy fog before noon. High near 67. South wind 9 to 13 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
- Thursday Night - A chance of showers, mainly before midnight. Mostly cloudy, then gradually becoming mostly clear, with a low around 49. Chance of precipitation is 40%.
- Friday - Mostly sunny, with a high near 65.
- Friday Night - Partly cloudy, with a low around 45.
- Saturday - Partly sunny, with a high near 63.
- Saturday Night - Mostly cloudy, with a low around 45.
- Sunday - Mostly sunny, with a high near 64.