A Nor'easter Blows From the Northeast but Moves Up the Coast

The wind comes one way, the storm another

Here is the part that sounds backwards. A nor'easter is built around a center of low pressure sitting just off the coast, and in the Northern Hemisphere air circles a low counterclockwise. Stand on a beach to the northwest of that center and the air arriving at your face has come in off the ocean from the northeast. That wind gives the storm its name.

The storm itself usually travels the other way. NOAA's satellite service says nor'easters begin forming within 100 miles of the coast between New Jersey and Georgia, and the Weather Service describes them moving northeastward toward New England. So a storm named for a northeast wind is generally born to your south and walks north toward you. The name describes the weather on the porch. It says nothing about the route.

This storm had a helper. The Philadelphia Inquirer reported on September 25, 2026 that a strong high-pressure system to the north was supplying the cold air, its clockwise winds already blowing from the northeast. Air spins one way around the high and the opposite way around the low, so along the coast between them both push in the same direction. That squeeze is a big part of how a nor'easter can keep pressing on the same beaches for days.

Franklin's missing eclipse

Franklin told the whole story in a letter to his friend Jared Eliot, dated February 13, 1750. He had assumed that a storm arriving from the northeast must have hit Boston first. Then the Boston papers printed an account of someone there observing the very eclipse he had missed. He wrote to his brother in Boston, who told him the eclipse had been over an hour before the storm began.

Put plainly, the storm started downwind and worked its way upwind, against the very breeze it was making. Franklin did not trust one lucky observation. He spent years questioning travellers and reading newspapers from New England to South Carolina before calling it a constant fact.

Then comes the part I find most endearing. He admitted that his explanation was only conjecture, and he reached for household comparisons to make it. When a fire burns in a chimney, he wrote, air flows from the door toward the fire, yet the motion begins at the chimney and spreads backward to the door. Open the gate on a mill-race and the water nearest the gate moves first, while the far end of the race moves last.

His theory about sun-heated air over Florida and the Gulf does not match the modern picture of these storms. His observation holds up. And the family kept the story going: a footnote in the collected letters credits Alexander Dallas Bache with fixing the eclipse to the evening of October 21, 1743, on the Old Style calendar, in an 1833 paper for the Journal of the Franklin Institute. Bache was Franklin's great-grandson, and he later ran the United States Coast Survey, the agency charting the very shoreline those storms walk up. NOAA's hurricane research lab dates the storm itself to November 2, 1743 on the modern calendar.

What feeds a nor'easter

The engine is a temperature contrast. NOAA's satellite service puts it this way: the polar jet stream pushes cold air out of Canada toward the ocean, the Gulf Stream keeps the Atlantic warm, and where the two meet a low pressure system forms. The Weather Service calls the gap between mild air over the water and cold air over land the fuel that feeds these storms.

What that engine delivers depends on the month. In deep winter it can be heavy snow. In late September it is mostly rain, wind, pounding surf and high water at the shore.

Is late September nor'easter season?

Sort of, and I think the tension is worth knowing about. NOAA says nor'easters can happen any time of year but are most common between September and April, and most severe in winter. By that calendar, a late-September storm is standing on the front step of the season. The Weather Channel still called this one early-season, since these storms tend to cluster in late fall and winter, and Boston's mayor, Michelle Wu, was blunter, as quoted by NBC News.

Both things are true. September sits inside the window, but a strong nor'easter that early is uncommon enough to catch people off guard. WeatherBug meteorologist Madison Ryke flagged one reason the timing matters: the trees are still fully covered in leaves. A leafy crown catches far more wind than a bare one, so the same gusts ask more of a September maple than of a January one.

Then there is the moon. The Weather Channel noted that a full moon coincided with this storm, adding to tides that were already running 2 to 4 feet above normal at high tide in places. It may be the least romantic thing a full moon does all year.

Reading the next forecast like Franklin would

• Notice the wind direction, not just its speed. With your back to a steady northeast wind, the storm's center is roughly off to your left and ahead, out over the water to the southeast.
• Watch the high-tide times. The worst coastal flooding in a nor'easter tends to arrive with high tide, and a full or new moon adds to it.
• Plan for duration. The Inquirer notes that nor'easter winds can persist for days, which is what does the slow work on beaches.
• Treat your local National Weather Service office as the final word on warnings for your own town.

One thing we could not confirm is whether this particular storm deepened fast enough to earn the formal label bomb cyclone; that distinction is its own story. What is certain is that the next time the wind swings to the northeast and the grey comes up from the south, you will know which way the weather is really travelling. Franklin never did see that eclipse. He got a storm track instead, pieced together from letters and newspapers, and I would take that trade any night.