- The 2018 hurricane season begins June 1.
- Most forecasts predict that the number of hurricanes will be slightly above average, but more or fewer are always possible.
- The National Oceanic and Atmospheric Administration (NOAA) predicts a 75% chance of a normal or above-average hurricane season.
- Last year predictions were similar, but we had one of the most disastrous, extremely active hurricane seasons on record.
The 2018 hurricane season begins June 1.
Most initial forecasts project that the number of storms will be higher than average, and several forecasts indicate an above-average likelihood that a major hurricane will make landfall in the Caribbean, the Gulf Coast, or the US East Coast.
That includes the newly released forecast by the National Oceanic and Atmospheric Administration (NOAA), which projects a 75% chance that the season will be near or above normal in terms of hurricane activity.
The season may even kick off with an early storm before June 1. The latest projections from the National Hurricane Center say there’s a 90% chance that a tropical cyclone will form within the next five days, with the weather system likely to impact the Gulf Coast between Florida and Louisiana.
What to expect for 2018
An average hurricane season is based on the 30-year average from 1981 to 2010. By that definition, an average season includes 12 named storms and six hurricanes, with three of those being major hurricanes – storms that qualify as category 3 or higher on the Saffir-Simpson scale.
Before the 2017 hurricane season started, forecasts from NOAA, Colorado State University’s Tropical Meteorology Project, and The Weather Channel had pegged that year as likely to be above average but not extreme. It turned out to be one of the most disastrous, extremely active hurricane seasons on record.
So it’s important to remember that the current forecasts are still preliminary and will be updated at the start of the season and during the season.
The forecasters at NOAA say there’s a 40% chance the coming season will be near normal, and a 35% chance the season will be above normal. They predict 10 to 16 named storms. Of those, they expect five to nine to be hurricanes, with one to four of those being major hurricanes.
The researchers at Colorado State’s Tropical Meteorology Project issued their extended range forecast for the 2018 season on April 5, predicting 14 named storms. Of those, they forecast seven hurricanes, three of which could be major.
The Weather Channel’s early predictions suggest a more average year, with 13 named storms and six hurricanes, two that qualify as major hurricanes. A team at North Carolina State announced April 16 that it predicted 14 to 18 named storms, seven to 11 of them hurricanes. Of those, the team expects three to five to be major.
Hurricanes in the Atlantic are formed by a confluence of global conditions, including ocean temperatures in both the Atlantic and the Pacific (which can affect winds), long-term ocean currents, and atmospheric winds. Right now, the western Atlantic is abnormally warm, but the eastern and northern Atlantic are abnormally cool. A weak La Niña event in the Pacific (which means that waters are cool) is expected to transition to a state of “ENSO-neutral,” meaning there won’t be any La Niña or El Niño conditions. That was the situation last year as well. A weak El Niño is also possible.
It takes just one storm
No matter how many storms end up forming in the coming months, it takes only one hurricane hitting a populated area to make a season “active” for coastal residents.
Even storms that don’t qualify as major hurricanes can still have major consequences. Harvey qualified as a tropical storm, not a hurricane, when it dumped record-setting rains on Houston and other parts of the Gulf Coast, causing the majority of the $US125 billion worth of damage.
A study published earlier this month found that in recent years, storms have become more intense in a short period of time, undergoing rapid intensification. That was the case for several of the most destructive storms of last summer and fall. Researchers also say that as the world gets warmer, we can expect to see more intense storms that dump more rain, causing floods.
Even though hurricane season starts soon, the season typically becomes more active later in the summer, reaching a peak in September.
For residents of the still-storm-battered Caribbean, the hope is for a respite in 2018. But it’s time to start preparing.