In some ways, it was the Florida Man of storms – not quite knowing when to say when.
Usually, thunderstorms fizzle out after they run out of rain or get cold air sucked in. They run out of gas. But not Wednesday, when the storm that hit Fort Lauderdale had a gas station nearby -- the warm and moisture-rich Gulf Stream.
The end result was more than 25 inches of rain drenching and flooding Fort Lauderdale in six to eight hours. That ranked among the top three in major U.S. cities over a 24-hour period, behind Hilo, Hawaii’s, 27 inches in 2000 and Port Arthur, Texas’s 26.5 inches in 2017, according to weather historian Chris Burt.
While it could happen in other places in coastal America, Florida has the right topography, plenty of warm water nearby and other favorable conditions, said Greg Carbin, forecast branch chief at the National Oceanic and Atmospheric Administration’s Weather Prediction Center.
Just two days before the downpour, Weather Prediction Center forecaster David Roth told colleagues that conditions were lining up similar to April 25, 1979, when 16 inches of rain fell on Fort Lauderdale, Carbin said.
What parked over Fort Lauderdale on Wednesday was a supercell — the type of strong thunderstorm that can spawn killer tornadoes and hail and plows across the Great Plains and Mid-South in a fierce, fast-moving but short path of destruction, several meteorologists said.
Airplanes sit on the runway due to flooding at Fort Lauderdale Hollywood airport Thursday, April 13, 2023 in Fort Lauderdale, Fla. Nearly a foot of rain fell in a matter of hours in Fort Lauderdale – causing widespread flooding, the closure of the city’s airport, all public schools and the suspension of high-speed commuter rail service. (Joe Cavaretta /South Florida Sun-Sentinel via AP)
Airplanes sit on the runway due to flooding at Fort Lauderdale Hollywood airport Thursday, April 13, 2023 in Fort Lauderdale, Fla. Nearly a foot of rain fell in a matter of hours in Fort Lauderdale – causing widespread flooding, the closure of the city’s airport, all public schools and the suspension of high-speed commuter rail service. (Joe Cavaretta /South Florida Sun-Sentinel via AP)
Travelers are left stranded at Fort Lauderdale Hollywood airport, Thursday, April 13, 2023 in Fort Lauderdale, Fla. Nearly a foot of rain fell in a matter of hours in Fort Lauderdale – causing widespread flooding, the closure of the city’s airport, all public schools and the suspension of high-speed commuter rail service. (Joe Cavaretta /South Florida Sun-Sentinel via AP)
Travelers are left stranded at Fort Lauderdale Hollywood airport, Thursday, April 13, 2023 in Fort Lauderdale, Fla. Nearly a foot of rain fell in a matter of hours in Fort Lauderdale – causing widespread flooding, the closure of the city’s airport, all public schools and the suspension of high-speed commuter rail service. (Joe Cavaretta /South Florida Sun-Sentinel via AP)
City of Miami Community Response Team Member Eddy Hernandez uses a shovel to scoop debris from a drain following heavy rain at the Bay of Pigs Memorial Park on Wednesday, April 12, 2023, in Miami, Fla. (Matias J. Ocner/Miami Herald via AP)
Exit 2 off of the MacArthur Causeway floods over the road and onto the sidewalk during a rain storm, Wednesday, April 12, 2023, in Miami. A torrential storm bought heavy showers, gusty winds and thunderstorms to South Florida on Wednesday and prompted the closure of Fort Lauderdale-Hollywood International Airport and the suspension of high-speed commuter rail service in the region.(Alie Skowronski/Miami Herald via AP)
A surfer walks at the Bal Harbour Lighthouse on Wednesday, April 12, 2023, in Bal Harbour, Fla. According to the National Weather Service, rip current risk remains in effect until Thursday evening. (David Santiago/Miami Herald via AP)
Cars go through the flooded road cause by heavy rains at North Bay Rd and 179th Dr. in Sunny Isles Beach, Fla., Wednesday, April 12, 2023. A torrential storm bought heavy showers, gusty winds and thunderstorms to South Florida on Wednesday and prompted the closure of Fort Lauderdale-Hollywood International Airport and the suspension of high-speed commuter rail service in the region.(David Santiago/Miami Herald via AP)
A haze sets over the city during a rain storm, Wednesday, April 12, 2023, in Miami. A torrential storm bought heavy showers, gusty winds and thunderstorms to South Florida on Wednesday and prompted the closure of Fort Lauderdale-Hollywood International Airport and the suspension of high-speed commuter rail service in the region.(Alie Skowronski/Miami Herald via AP)
A group of people in raincoats walk east along Hollywood Blvd. in the pouring rain on Wednesday, April 12, 2023 in Hollywood, Fla. A torrential storm bought heavy showers, gusty winds and thunderstorms to South Florida on Wednesday and prompted the closure of Fort Lauderdale-Hollywood International Airport and the suspension of high-speed commuter rail service in the region. (Mike Stocker/South Florida Sun-Sentinel via AP)
Waves crash against the jetty at the Bal Harbour Lighthouse on Wednesday, April 12, 2023, in Bal Harbour, Fla. Rip current risk remains in effect through until Thursday evening. David Santiago(/Miami Herald via AP)
Cars plow through a flooded 14th Avenue, Wednesday, April 12, 2023 in Hollywood, Fla. A torrential storm bought heavy showers, gusty winds and thunderstorms to South Florida on Wednesday and prompted the closure of Fort Lauderdale-Hollywood International Airport and the suspension of high-speed commuter rail service in the region. (Mike Stocker/South Florida Sun-Sentinel via AP)
A truck drives through flooding in Little Haiti during a rain storm, Wednesday, April 12, 2023, in Miami. A torrential storm bought heavy showers, gusty winds and thunderstorms to South Florida on Wednesday and prompted the closure of Fort Lauderdale-Hollywood International Airport and the suspension of high-speed commuter rail service in the region.(Alie Skowronski/Miami Herald via AP)
A tow truck goes through the flooded road cause by heavy rains at North Bay Rd and 179th Dr. in Sunny Isles Beach, Fla., Wednesday, April 12, 2023. A torrential storm bought heavy showers, gusty winds and thunderstorms to South Florida on Wednesday and prompted the closure of Fort Lauderdale-Hollywood International Airport and the suspension of high-speed commuter rail service in the region.(David Santiago/Miami Herald via AP)
Broward Sheriff's Office deputies direct traffic away from the Fort Lauderdale-Hollywood International Airport, which has closed to all flights and traffic on Wednesday, April 12, 2023, in Fort Lauderdale, Fla. (Carline Jean/South Florida Sun-Sentinel via AP)
A car goes through the flooded road cause by heavy rains at North Bay Rd. in Sunny Isles Beach, Fla., Wednesday, April 12, 2023. A torrential storm bought heavy showers, gusty winds and thunderstorms to South Florida on Wednesday and prompted the closure of Fort Lauderdale-Hollywood International Airport and the suspension of high-speed commuter rail service in the region.(David Santiago/Miami Herald via AP)
A Broward Sheriff's Office Deputy directs traffic away from the Fort Lauderdale-Hollywood International Airport, which has closed to all flights and traffic on Wednesday, April 12, 2023, in Fort Lauderdale, Fla. (Carline Jean/South Florida Sun-Sentinel via AP)
A school crossing guard helps people cross the street in the pouring rain at Dania Elementary School Wednesday, April 12, 2023 in Dania, Fla. A torrential storm bought heavy showers, gusty winds and thunderstorms to South Florida on Wednesday and prompted the closure of Fort Lauderdale-Hollywood International Airport and the suspension of high-speed commuter rail service in the region. (Mike Stocker/South Florida Sun-Sentinel via AP)
A car pulls into a parking garage on 25th street during a rain storm, Wednesday, April 12, 2023, in Miami. A torrential storm bought heavy showers, gusty winds and thunderstorms to South Florida on Wednesday and prompted the closure of Fort Lauderdale-Hollywood International Airport and the suspension of high-speed commuter rail service in the region.(Alie Skowronski/Miami Herald via AP)
A woman sits at a bus stop on Biscayne Boulevard during a rain storm, Wednesday, April 12, 2023, in Miami. A torrential storm bought heavy showers, gusty winds and thunderstorms to South Florida on Wednesday and prompted the closure of Fort Lauderdale-Hollywood International Airport and the suspension of high-speed commuter rail service in the region.(Alie Skowronski/Miami Herald via AP)
A gHollywood beach is empty during heavy, Wednesday, April 12, 2023 in Hollywood, Fla. A torrential storm bought heavy showers, gusty winds and thunderstorms to South Florida on Wednesday and prompted the closure of Fort Lauderdale-Hollywood International Airport and the suspension of high-speed commuter rail service in the region. (Mike Stocker/South Florida Sun-Sentinel via AP)
A tow truck goes through the flooded road cause by heavy rains at North Bay Rd and 179th Dr. in Sunny Isles Beach, Fla., Wednesday, April 12, 2023. A torrential storm bought heavy showers, gusty winds and thunderstorms to South Florida on Wednesday and prompted the closure of Fort Lauderdale-Hollywood International Airport and the suspension of high-speed commuter rail service in the region.(David Santiago/Miami Herald via AP)
City of Miami police officer Ryan Dreseris helps direct traffic in heavy rain before the start of an event at the Bay of Pigs Memorial Park on Wednesday, April 12, 2023, in Miami. (Matias J. Ocner/Miami Herald via AP)
A man stops to take pictures of his flooded neighborhood along SW 3rd Street and SW 4th Ave in Dania Beach, Fla., on Wednesday, April 12, 2023. (Carline Jean/South Florida Sun-Sentinel via AP)
Normally a cell like that would “snuff itself out” in maybe 20 minutes or at least keep moving, Carbin said. But in Fort Lauderdale the supercell was in a lull between opposing weather systems, Carbin said. It lasted six to eight hours.
“You had this extreme warmth and moisture that was just feeding into the cell and because it had a bit of a spin to it, it was essentially acting like a vacuum and sucking all that moisture back up into the main core of the system,” said Steve Bowen, a meteorologist and chief science officer for GallagherRe, a global reinsurance broker. “It just kept reigniting itself, essentially.”
What was key, said former NOAA chief scientist Ryan Maue, was “the availability of warm ocean air from the Gulf Stream was essentially infinite.’’
Other factors included a strong low pressure system, with counterclockwise winds, churning away in the toasty Gulf of Mexico, Maue and Carbin said. There was a temperature difference between the slightly cooler land in Florida and the 80-degree-plus Gulf Stream waters. Add to that wind shear, which is when winds are flowing in opposite directions at high and low altitude, helping to add some spin.
Many of those conditions by themselves are not unusual, including the location of the Gulf Stream. But when they combined in a precise way, it acted like a continuous feeding loop that poured rain in amounts that the National Weather Service in Miami called a 1-in-1,000 chance.
“We continue to see more and more of these thousand-year” weather extremes in major cities, Bowen said. “The whole definition of normal is changing.”
Physics states that a warmer climate holds more moisture in the air, about 4% more for every degree Fahrenheit (7% for every degree Celsius). But warming also increases the intensity of storms amplifying that moisture level, said Pennsylvania State University climate scientist Michael Mann.
One-day downpours have “increased in frequency and magnitude over the last several decades and will continue to increase in both in the coming decades,” University of Oklahoma meteorology professor Jason Furtado said in an email. “These heavy rainfall events coupled with sea level rise on the Florida coast need to serve as significant ‘wake up calls’ for the residents of South Florida about the severe risks that climate change poses to them.”
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