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Hurricane Season - The terminology you must know

12:30 PM
September 28, 2025

Hurricane Season
The terminology you must know

Hurricane Lee as seen on satelliteHurricane Lee as seen on satellite - © NASA

It can be a lot and sometimes confusing. What better time than to review or learn the season’s lingo? It will help you understand our tropical weather forecasts and get a better sense of when a situation becomes more urgent.

Subtropical storms

Subtropical storms are often seen before the season starts and over the northern Atlantic waters. They are like tropical storms as they can develop over tropical or subtropical waters with a temperature of at least 70 F. They also have a closed circulation, but the difference is in their organization. Usually, their maximum winds occur well far from the center (at more than 60 nautical miles from it) and tend to be messy or, asymmetric. Its rains are usually shifted to the side.

Eye

The center of the storm. If you are in the eye, you can see the stadium effect -- where the clouds stack up like a stadium. It is the calmest part of the storm. You can even see the blue sky during the day and stars at night.

Eyewall

The eyewall is the most dangerous portion of the storm. This is the only area where you will find the winds that are the "strength" of the hurricane, or maximum sustained winds. Winds in this area are measured by Hurricane hunters’ dropping sondes or by satellites if the storm is far away.

Hurricane-force winds

Hurricane-force winds weaken the farther you move away from the eye. In just a few miles you can drop a whole category.

Tropical-storm-force winds

Tropical-storm-force winds usually are felt throughout a large swath of a hurricane. But they do not stretch as far as the outer edge of the clouds. These winds are still dangerous but are not the worst of the storm.

Outer bands

These are bands that spiral out of the storm like a pinwheel with water on it. These lines of storms are where tornadoes typically form. It is also where flooding can occur. The bands can create a "training" effect where it just continues to rain in the same place. We saw this in Houston for days after Harvey in 2017.

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