The North Atlantic basin was extremely active in September 2017. Four tropical cyclones formed, all of which became hurricanes, and three of those four became major hurricanes, NWS National Hurricane Center in Miami, Florida said in their Monthly Tropical Weather Summary issued October 1, 2017.
Hurricane Irma was also present in the basin as a major hurricane during the month, although it formed in late August. Both Irma and Maria reached category 5 intensity during the month of September.
Based on a 30-year climatology (1981-2010), the number of named storms forming in the basin during September was near average, but the numbers of hurricanes and major hurricanes were both well above average.
GOES-16 clean window view of Atlantic hurricanes August/September 2017. Loop shows storms Franklin through Maria using the 10.3-micron imagery from Goes-16. Credit: CIMMS Satellite Blog
In terms of the Accumulated Cyclone Energy (ACE), which measures the combined strength and duration of tropical storms and hurricanes, September 2017 was the most active month on record, easily breaking the previous record of September 2004. Overall, this September was about 3.5 times more active than an average September from 1981-2010.
From a seasonal perspective, activity in the Atlantic basin so far in 2017 is well above average, and this season is the 3rd most active on record to date in the basin, behind 1933 and 2004.
* Denotes a storm for which the post-storm analysis is complete.
Featured image: Hurricanes Katia, Irma and Jose – September 2017. Credit: NOAA/GOES-16
If you value what we do here, create your ad-free account and support our journalism.
Producing content you read on this website takes a lot of time, effort, and hard work. If you value what we do here, select the level of your support and register your account.
Your support makes this project fully self-sustainable and keeps us independent and focused on the content we love to create and share.
All our supporters can browse the website without ads, allowing much faster speeds and a clean interface. Your comments will be instantly approved and you’ll have a direct line of communication with us from within your account dashboard. You can suggest new features and apps and you’ll be able to use them before they go live.
You can choose the level of your support.
Stay kind, vigilant and ready!