Hours before it hit land, Hurricane Idalia rapidly intensified due to warm seas in the Gulf of Mexico, a condition that experts predict will happen more frequently as the world warms.
Idalia’s winds increased by 55 mph in just one day as it swept over the Gulf on Tuesday, going from a Category 1 hurricane to a Category 4 storm by early Wednesday. A few hours later, it made landfall in Florida’s Big Bend, close to Keaton Beach, as a Category 3 storm, having somewhat diminished from its initial strength.
Idalia’s escalation in intensity as it neared the Florida shore, however, is “to be expected with hotter ocean temperatures,” according to Jeff Masters, an earlier hurricane scientist at the National Oceanic and Atmospheric Administration who is now a meteorologist for Yale Climate Connections.
In recent months, the world’s seas have broken records for temperature, with certain bodies of water, such as the North Atlantic, the Gulf of Mexico, and the Caribbean Basin, experiencing extreme marine heat waves.
Levi Cowan, a tropical cyclone forecaster, examined sea surface temperatures and reported them on his website, Tropical Tidbits. The majority of the eastern Gulf of Mexico was 2 to 4 degrees Fahrenheit warmer compared with average, with a few isolated locations along the coast, close to where Idalia made landfall, being up to 5 degrees above average.
Masters cited a string of hurricanes that have intensified quickly since 2017.
“We’ve seen this movie a lot,” he remarked. “We witnessed this with Hurricane Ian last year, despite the fact that it weakened slightly just before making landfall. This happened in Louisiana the previous year during Hurricane Ida. Laura and I witnessed it. Harvey and I witnessed it. So, shortly before landfall, there are lots of quick intensifiers.
FEMA Administrator Deanne Criswell stated during a White House briefing on Wednesday that hurricanes in recent years have intensified quickly due to increased ocean temperatures.
The difficulties experienced by local officials in the hours and days before storms have increased as a result of these incidents.
The local disaster management professionals have less time to issue warnings, order evacuations, and get people to safety since these storms are intensifying so quickly, according to Criswell.
Warm oceans, weak upper-level winds, and an abundance of atmospheric moisture are the three key factors that might cause a storm to intensify quickly.
“Rapid intensification” is defined by the National Hurricane Center as an increase in sustained winds of at least 35 mph over a period of 24 hours.
Idalia’s development into a Category 4 hurricane, which was exactly what experts had anticipated as the storm traveled through the warm waters of the eastern Gulf, was described as “impressive” by Jill Trepanier, an associate professor & climate scientist at Louisiana State University.
Idalia also passed through a pocket of minimal wind shear, which is the term used to describe the alteration in wind direction and speed at various atmospheric altitudes. Large storms may be disrupted by strong wind shear, which may cause them to weaken or disintegrate totally.
Idalia effectively did that when it got closer to the Florida shore, which assisted in downgrading the storm before it made landfall.
According to Corene Matyas, a professor in the geography department at the University of Florida, “A hurricane, which builds at the bottom up, disrupts its circulation when it moves into a zone wherein the upper-level winds are really strong.”
Even though Idalia dropped to a Category 3 hurricane prior to making landfall, considerable damage is still anticipated along the coast.
For those who were further inland, I’m delighted it started to diminish soon, but an event that is intensifying as it approaches the coast is more dangerous, Trepanier wrote in an email. “I am terrified by the images of what happened.”
According to experts, climate change may cause rapid intensification to occur more frequently.
Computer simulations and climate models were utilized in a 2019 report that was published in the journal Nature Communications to research the development and growth of tropical cyclones from 1982 to 2009. The study’s findings suggest that the development and intensification of tropical cyclones were likely fueled by warmer ocean temperatures brought on by human-caused climate change.
Since 2010, a number of significant hurricanes have rapidly intensified, notably Dorian in 2019, whose peak winds rose from 150 mph to 185 mph in just nine hours. Two periods of rapid intensification preceded Hurricane Ian’s landfall in southwest Florida the previous year.
Idalia is now one of 10 storms since 1950 that have reached an intensity of at least 40 mph in the 24 hours prior to touching down in the United States, according to Masters.
“Sobering to see five of these storms happened over the past seven years,” he tweeted on Wednesday. “The likelihood of rapid intensification is increased by climate change.”
While the broad factors that lead to rapid intensification are known, additional research is still needed on the process itself. A portion of the issue is that there is simply not enough data available to make precise predictions about how and when this phenomenon will manifest itself.
“You need data right near the center of the cyclone over the ocean, but our ability to observe there is limited because hurricane cameras can’t fly that low. It’s not secure,” stated Masters.
However, scientists are aware that higher-than-normal sea surface temperatures are a crucial component.
According to Masters, warmer oceans will create the conditions for storms to strengthen more quickly in the future.
You haven’t noticed anything yet, he added, “because we’re still warming the ocean.”