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Fox News Weather Center

Moisture From Patricia to Fuel Soaking Rain in Midwest, East

As October winds down, the stretch of dry weather across the Midwest and East Coast will also come to an end as rain overtakes the region at midweek.

Dry weather has prevailed for much of this month, with many locations well below their normal rainfall.

The United States Drought Monitor shows 46 percent of the Midwest as abnormally dry and 11 percent in a moderate drought. In the Northeast, over a quarter of the region is either abnormally dry or coping with moderate drought conditions.

Major Travel Delays in the Northeast Wednesday

Several factors will come together to produce a wet few days for the eastern half of the country. Moisture will stream northward from Tropical Rainstorm Patricia, which has spread flooding rain from Texas and Mississippi into the Florida Panhandle.

"A developing system over the Upper Midwest will aid in pulling this moisture up from the Gulf before pushing it into the eastern part of the country," AccuWeather Meteorologist Tyler Roys said.

Rain will creep slowly north throughout the day Tuesday, reaching St. Louis during the morning hours and Chicago by the early afternoon. It will be a wet evening commute from Chicago to Washington, D.C., on Tuesday.

The northward push of rain will persist into Wednesday, with rain reaching Philadelphia and New York City by the early morning hours.

Rainfall amounts will generally average around 1-2 inches across the Midwest and East; however, some locations across the Ohio Valley could receive double that.

While the rainfall will be very beneficial in helping to ease the drought conditions, it will also have some negative impacts on roadway conditions.

"Rainfall will combine with a plethora of fallen leaves that will become soggy and flow into storm drains. These drains can easily become clogged, which will likely lead to flooding on roads," AccuWeather Chief Meteorologist Elliot Abrams said.

Motorists should take caution when traveling on side streets and parkways, as well as when exiting the highways.

"Slippery leaves can sneak up on you and cause car tires to slip on the wet roadway," Abrams said.

As colder air meets with this midweek storm, there is the potential for snow to fall on Wednesday night across far northern portions of the Upper Midwest.

"A mix of rain and snow will fall across the Arrowhead of Minnesota, with any accumulating snow staying confined to higher terrain. Those in southwest Ontario will see rain change to snow for a time on Wednesday night," Roys said.

A fresh batch of colder air will be surge into the Northeast on Thursday, with temperatures falling to a few degrees below seasonable. Trick-or-treaters headed out on Friday or Saturday night will want to bundle up, with low temperatures tumbling into the 30s across the Northeast.