Skip to main content
U.S. flag

An official website of the United States government

USGS has released the final Flood and Storm Tracker (FaST) map for Hurricane Ian.

A map of Florida indicating the possible spread of Cuban treefrogs due to Hurricane Ian floodwaters and storm surge. Text on the left side explains the map and provides a citation and species information.
The USGS Nonindigenous Aquatic Species (NAS) database produces a Flood and Storm Tracker (FaST) map after major storm events to provide information to managers on the possible spread of aquatic non-native species. This map reflects the possible spread of Cuban treefrogs due to Hurricane Ian's floodwaters and storm surge. 

An estimated 186 non-native aquatic species could have been spread to new areas by Hurricane Ian’s floodwaters, according to a recently released USGS online map.


Storm surge and flooding caused by hurricanes and other storms can carry non-native plants and animals to new locations. Once established, they can be difficult to eradicate and can damage infrastructure and harm native ecosystems.


To help resource managers prepare for possible introduction of new non-native species, the USGS Nonindigenous Aquatic Species (NAS) team creates a Flood and Storm Tracker (FaST) map after large storms or flooding events to demonstrate the number and extent of non-native species’ possible spread.


The FaST maps are created by combining information from USGS streamgages, such as water levels, flow, and storm surge heights, with records of known non-native species from the NAS database. The NAS database tracks the distribution of non-native aquatic plants and animals across the U.S. The maps provide resource managers an early warning, helping them prepare for the removal of possible invasive plants and animals before they spread further.


A preliminary map is created within days of the storm’s initial impact. The NAS team then revises the map once flooding data becomes available. The final map is created approximately one year after the storm.


Hurricane Ian made landfall in southwest Florida in September 2022 as a Category 4 storm, making it the strongest storm to hit Florida since Hurricane Michael in 2018.

Get Our News

These items are in the RSS feed format (Really Simple Syndication) based on categories such as topics, locations, and more. You can install and RSS reader browser extension, software, or use a third-party service to receive immediate news updates depending on the feed that you have added. If you click the feed links below, they may look strange because they are simply XML code. An RSS reader can easily read this code and push out a notification to you when something new is posted to our site.