Flash flooding forced Greenwich police to close five roads and partially close a sixth Sunday, Sept. 13, as heavy rain hit the region through the morning.

Full closures were reported at 20 Riverside Lane, 220 Henry St., 1 East Weaver St., 1 and 7 Benjamin St. and 49 Mallard Drive. Sound Beach Avenue near No. 90 was partially closed, according to Patch. Police also flagged flooding hazards at 1 Bolling Place and 1 Jones Park Drive.

Flooding hit I-95 southbound between exits 6 and 5 by about 9:30 a.m., leaving only one lane open.

The National Weather Service (NWS) issued a flash flood warning for southern Fairfield County and southern Westchester County, in effect until 11 a.m. Sunday. Thunderstorms were producing 1 to 2 inches of rain per hour, according to Greenwich Free Press.

First Selectman Fred Camillo urged drivers to stay off Greenwich roads, especially in low-lying and flood-prone areas. The town warned that drivers who must travel should turn around immediately at any flooded road, saying most flood deaths occur in vehicles.

Authorities also warned that even a few inches of moving water can sweep away a vehicle, WTNH reported.

Old Greenwich flooded too. Water was reported around Binney Park.

The Weather Prediction Center placed much of Connecticut at a Level 2 out of 4 risk for excessive rainfall. WTNH meteorologist Zack Duhaime reported widespread totals of 1 to 3 inches were expected across the flood watch area, with some towns potentially receiving 5 to 7 inches.

Neighboring departments issued similar warnings. Stamford police urged residents to avoid unnecessary travel. Norwalk police said the city was under a flash flood warning and told drivers not to travel through standing water.

Rain was forecast to taper off by mid-afternoon Sunday, with skies clearing by late afternoon.