A rare variety of storm began dumping heavy rain across most of America’s East Coast Friday, according to USA Today.
The National Weather Service said that the weather system is a “cool-season nor’easter” rather than the more typical summertime pattern.
Nor’easters are reportedly storms that strike the East Coast in fall, winter and spring, at times resulting in heavy snow and howling winds across the region.
USA Today reported that Friday’s storm, which has conditions more common in autumn, will range from most of the mid-Atlantic and the southern coast of New England.
Some Twitter users on Friday expressed wonder at the weather pattern, which will reportedly cause serious rain, flooding and unpleasant conditions in impacted areas Friday.
Imagine if this was snow from the anti-winter nor'easter— Eric Allen (@THE_Eric_Allen) July 28, 2017
AccuWeather said that thick rain, low clouds and fog will likely cause significant airline delays at major hubs like Baltimore, New York City and Washington, D.C.
Driving will also reportedly prove difficult in states like Delaware, Maryland and Virginia due to persistent downpours, excess water on roads and bad visibility.
AccuWeather also issued flash flood warnings for parts of the Ohio Valley and mid-Atlantic regions as part of the storm’s fallout.
The weather service noted that up to five inches of rain may pour on the central Appalachians eastward to the northern mid-Atlantic coast through Saturday.
Some areas will reportedly experience major downpours, with rain fall rates possibly exceeding 2 inches hourly.
The Storm Prediction Center added that temperatures in the regions hit by the storm will likely be cooler than average for a few days.
The weather service noted that enough dry air should have mixed into the storm by Sunday to cause some sunlight further inland, while coastal areas may still have clouds and rain showers.