Following a surge of unusual warmth in the northeastern U.S., a round of soaking rain will arrive during late week and a blast of chilly air will follow.
"A powerful storm system will develop across the Ohio Valley and will result in big changes in the weather pattern," AccuWeather Meteorologist Brett Rathbun said.
This storm will track from the Ohio Valley into the Northeast Thursday and Friday and eventually into Quebec over the weekend. Along this track, a swath of soaking rain and strong winds will develop.
The heaviest rain will likely fall on the backside of the system from eastern Ohio to western and northern New York, far eastern Ontario and into Quebec.
"Between 2 and 4 inches of rain can fall in this corridor," Rathbun said.
Intermittent rain will fall across New England as well as this system pulls in moisture from the Atlantic Ocean. As a result, pockets of heavy rain may occur on Friday.
The amount of rain that falls will depend on a potential tropical system in the Atlantic, which may become Tropical Storm Otto.
"There is a chance that some additional moisture could be pulled in from a brewing tropical system," Rathbun said. "This could enhance rainfall across New England."
Any outdoor activities Thursday and Friday will be greatly impacted and may be postponed or canceled.
Those heading to Friday night high school football games will need umbrellas and ponchos to help stay dry.
Motorists will likely face tough driving conditions in the heavy rain. Lowered visibility and localized flooding will slow traffic on area roadways.
While the rain will bring a risk for localized flooding, it will also prove to be beneficial to the region. Drought is gripping the region, with the worst conditions focused across New England. Rainfall deficits in parts of New England are greater than 15 inches since the beginning of the year.
The storm will also drive strong winds across the eastern Great Lakes and Northeast Thursday night through Saturday. Wind gusts to 45 mph will batter the region with locally higher gusts possible along the New England coast.
This will likely bring down a lot of leaves in the area, especially across New England where fall foliage will be at or past peak. Unfortunately, this will ruin leaf-peeping opportunities.
Motorists will need to be aware of fallen leaves on streets. Wet leaves bring slippery conditions and they also clog storm drains, which can slow water drainage and lead to flooding.
Chilly air to arrive over the weekend across Great Lakes, Northeast
As the storm system tracks through Quebec on Saturday, a strong northwesterly wind in its wake will help pull some of the coldest air felt since early May into the region.
Daytime highs on Saturday will only rise into the 50s F for most of the Northeast. Along the Interstate 95 corridor, temperatures will struggle to reach into the 60s.
"Some locations across the interior Northeast may not even reach 50 on Saturday," Rathbun said.
With the cold air moving over the relatively warm Great Lakes, clouds and lake-effect showers will impact areas downwind across Ontario and northeastern Ohio through Upstate New York on Saturday.
"Surface temperatures will remain warm enough that precipitation will fall in the form of rain," Rathbun said. "However, higher elevations could have a few snowflakes mix in."
Temperatures will likely run 5 to 10 degrees below normal during the afternoons this weekend. This may extend into next week as well, but typical roller-coaster swings in temperature will continue through the autumn.
"Overall, temperatures look to remain above normal despite periodic cooler days," AccuWeather Long-Range Meteorologist Ed Vallee said. "We continue to monitor a variety of long-range information that points to perhaps a more significant cooldown by the middle of November."