For some parts of the U.S., those planning outdoor activities for Memorial Day weekend might have to come up with a plan B. A rare nor’easter is underway in New England on Thursday, bringing strong winds and heavy rainfall.

Memorial Day weekend marks the unofficial start of summer for many in the United States, but it won’t feel like that in the East leading up to the holiday thanks in part to a rare May nor’easter.

A soggy Tuesday with possible severe storms, cooler temps, and a slow warm-up through the holiday weekend—get your full Chicagoland forecast here.

A slow-moving system means rain could force those planning outdoor activities in the central and southern U.S. this holiday weekend to come up with a Plan B on one or more days.