What is hurricane season? Plain-English meaning

Short definition: Hurricane season is the designated portion of the year when ocean temperatures and atmospheric conditions are most favorable for the formation of tropical cyclones, including hurricanes.

Plain-English explanation

Hurricane season is a calendar period set by weather agencies to help people prepare for the time of year when hurricanes are most likely to form. It is not a guarantee that storms will happen only during that window; instead, it marks the months when conditions in the ocean and atmosphere are most likely to produce these powerful storms. The season varies by region because it depends on ocean temperatures and wind patterns, which change with the Earth's tilt and its orbit around the Sun. For example, the Atlantic hurricane season typically runs from June 1 to November 30, while the eastern Pacific season starts on May 15. Knowing the season helps communities, businesses, and residents plan ahead for possible storms.

Why it matters

Understanding hurricane season matters because it tells you when to be alert and prepared. If you live in or travel to a coastal area that can be affected by hurricanes, knowing the season helps you plan travel, secure property, and follow local safety guidance. It also helps you interpret weather forecasts and news reports, so you can tell the difference between a normal weather pattern and a real threat.

Concrete example

A family planning a beach vacation in the Caribbean in August should be aware that this month falls within the Atlantic hurricane season. They might choose to buy travel insurance, check the forecast before booking, and have a backup plan in case a storm forms during their trip.

Common confusion

People often confuse hurricane season with a single storm or with a warning. Hurricane season is a long period of heightened risk, not a specific event. A hurricane watch or warning is issued for a particular storm that is approaching a specific area, usually only a few days in advance.

Related terms

tropical cyclone, tropical storm, hurricane warning

Practical tips

Array

Common questions

Array

Key takeaways

Array

Step by step

Array

More context

Hurricane season varies by ocean basin; the Atlantic season is the most widely known in the United States, but the Western North Pacific has typhoon season year-round with peaks in summer. The National Hurricane Center names storms from a rotating list to improve communication. On average, the Atlantic sees about 14 named storms per year, but this number can vary widely due to natural climate oscillations like the Atlantic Multidecadal Oscillation.

Additional background

The concept of a defined hurricane season emerged from records showing that tropical cyclones in the North Atlantic occur almost exclusively between June and November due to warm ocean waters and low wind shear. The official season dates were established to focus public awareness and preparation efforts. However, in recent decades, storms have occasionally formed before June 1, prompting discussions about extending the season. Hurricane seasons are measured by the number of named storms, hurricanes, and major hurricanes, with an average season producing about 14 named storms, 7 hurricanes, and 3 major hurricanes (based on 1991-2020 averages). The most active season on record was 2020, with 30 named storms, which exhausted the alphabetical naming list and forced the use of Greek letters. Climate change is expected to increase the intensity of the strongest storms and the amount of rainfall they produce, though the total number of storms may not increase. Preparedness campaigns, such as National Hurricane Preparedness Week, help educate the public on risks and actions. Understanding the science behind hurricane formation and the historical patterns of activity is essential for coastal residents and emergency managers alike.