What is a nor’easter? Why it can blow like a hurricane

A nor’easter is an East Coast storm named for northeasterly winds. It can produce hurricane-force gusts without being a hurricane.

That sounds contradictory until you separate a storm’s type from the strength of its wind. The National Weather Service describes a nor’easter as a strong low-pressure system affecting the Mid-Atlantic and New England. NOAA uses the term for storms along North America’s East Coast.

Why is it called a nor’easter?

The name points to the direction the strong coastal winds come from: the northeast. It does not mean every nor’easter brings snow, or that it only happens in winter. The National Weather Service says these storms can occur at any time of year; they are most frequent and severe from September through April.

Nor’easter vs. hurricane

Both systems have winds that spiral around low pressure, but they form differently. A hurricane is a tropical cyclone that forms over tropical or subtropical water. NOAA calls it a hurricane when its maximum sustained winds reach 74 mph (119 km/h).

A nor’easter is a different kind of East Coast storm. NOAA says its wind gusts can even exceed hurricane-force. That describes a gust’s strength; it does not turn the storm into a tropical cyclone. A gust and maximum sustained wind are also different measurements.

Will it bring snow, rain or flooding where you are?

That depends on the storm’s track and local temperatures. One system can bring rain in one place, snow in another, and strong surf or coastal flooding farther along the shore. “Nor’easter” names a kind of storm; it does not tell you what will happen at your address.

Check the National Weather Service forecast for your location and destination, including the alert area, start and end time, wind gusts, and any coastal or flash-flood warning. Follow the latest local instructions. The storm label alone is not a safe-travel decision.

Remember: “Hurricane-force” compares wind strength. It does not classify the storm. Check your local forecast for the hazard that applies to you.

This guide explains U.S. East Coast weather terms; alert names and thresholds differ by country. It is not a live forecast.

Sources: NOAA, What Is a Nor’easter? · National Weather Service, Nor’easter safety · NOAA, What Is a Hurricane? · National Weather Service glossary.