A significant September nor’easter is potentially heading toward Massachusetts and the Boston area this weekend, coinciding with the official arrival of fall. While nor’easters are coastal storms most commonly associated with late fall, winter, and spring, this upcoming system is driven by a strong ocean storm and a severe dip in the jet stream that will cause it to linger.

Key details from the forecast include:

• Timing and Duration: The brunt of the rain and wind is expected to arrive starting Saturday, with the system potentially sticking around and spinning off the coast for several days, possibly lasting into early next week.

• Winds and Impacts: The highest impacts will be concentrated near the coastline, stretching from the North Shore of Massachusetts down through the Cape and Islands. Northeasterly wind gusts are expected to ramp up to 45–55 mph right at the coast, and could peak between 50 and 70 mph over the Cape and Islands.

• Coastal Concerns: Offshore swells could reach over 10 feet, coinciding with rising monthly tides early next week. This setup brings a high risk of major beach erosionparticularly along northeast- and east-facing beachesalong with areas of minor coastal flooding over multiple consecutive high tides.

• Rainfall: While exact rainfall amounts remain tricky to predict depending on the exact storm track and duration, eastern Massachusetts could see several inches of rain between Saturday and Tuesday.

Forecasters note that it is still early in the forecast cycle and details may change, but coastal residents are advised to prepare for potential high winds, beach erosion, and minor flooding, while those with weekend plans should keep an eye on incoming weather updates.