Periods of soaking rainfall will drench portions of the northeastern United States from midweek through Friday.
Enough rain can fall during the second half of the week to slow travel, dampen outdoor events and cause localized flooding from Detroit to Washington, D.C., New York City and Buffalo, New York.
The rainfall late in the week will give the region a thorough soaking.
The rain is expected to ramp up late on Wednesday afternoon into Wednesday night across the mid-Atlantic before expanding into the interior Northeast.
Rounds of soaking rainfall will then continue due to a stalled system over the Ohio Valley through Friday. The rain may reach southern portions of New England late on Thursday into Friday.
There may be areas of substantial rainfall around this system, according to AccuWeather Chief Meteorologist Elliot Abrams.
The heaviest rain is expected to focus across Virginia, West Virginia, Maryland, Pennsylvania, western New York and eastern Ohio.
"Moisture from the Gulf of Mexico and Atlantic Ocean will be incorporated into this system, which will result in a widespread 1 to 3 inches of rain from northern Virginia to southern New York," AccuWeather Senior Meteorologist Matt Rinde said. "Local amounts up to 5 inches are possible."
"This will likely lead to flooding in some communities, especially in poor drainage areas," he said.
Motorists should be aware of standing water on side streets and the heightened risk of hydroplaning at highway speeds.
Residents will want to be sure to have an umbrella or rain jacket handy for the remainder of the week.
Despite the widespread nature of the rainfall, some areas may still be missed by the heaviest rain. Parts of New England, especially across the northern tier, may experience little to no rainfall into the weekend.
How far north the system crawls will determine whether more significant rainfall reaches Boston; Burlington, Vermont; and Portland and Bangor, Maine.
Even where the rain holds off for a time, plenty of clouds and a chilly breeze off the Atlantic will make for a dreary end of September.
Any non-flooding rainfall will be beneficial to drought-stricken areas of the Northeast.
According to the latest U.S. Drought Monitor released on Sept. 22, nearly 40 million Northeast residents are being affected by drought conditions. The most extreme drought conditions have focused on southern New England and into western and central New York over the past few months.
The clouds and rain will keep temperatures near or slightly below average for the remainder of the week, Rinde explained.
Highs will predominately remain in the 60s F and lower 70s across the region.