After weeks of warmer-than-average weather, millions across the eastern U.S. could get an early taste of winter this week. A surge of cold air and developing storms are poised to bring high winds, frigid temperatures, rain, and potentially accumulating snow to parts of the Mid-Atlantic and Northeast.

Thanks to a deep dip in the jet stream, an intrusion of cold air from Canada will send temperatures plummeting across the eastern half of the country by late Wednesday or Thursday morning, according to the National Weather Service. Between Wednesday and Friday, forecasters at The Weather Channel expect daytime highs to plunge 20 degrees Fahrenheit (11 degrees Celsius) from Chicago to Atlanta.

Enjoy the milder temperatures across the East because colder air is on the way 🥶. The next storm system will usher in high temperatures in the 40s and 50s, along with rain and blustery conditions. pic.twitter.com/y33xbgbTPu

Meanwhile, a developing storm system will migrate from the northern Plains into the Appalachians, intensifying and expanding to bring high winds to much of the eastern U.S. by Thursday morning. When the storm meets the surge of cold air, rain could turn to wintery precipitation. The upper Great Lakes could see wet snow by Thursday morning, NWS forecasters say.

By Thursday night, a nor’easter may form off the Eastern Seaboard, The Weather Channel reports. That system could bring a wintery mix or snow to the Mid-Atlantic and New England over the weekend.

Those are the big questions right now. The forecast is still solidifying, so expected snowfall totals and locations are still largely uncertain.

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