‘Catastrophic flash flooding possible’ with heavy rain falling on still-flooded South Florida | CNN (2024)

‘Catastrophic flash flooding possible’ with heavy rain falling on still-flooded South Florida | CNN (1)

People navigate a flooded street as they evacuate on June 12, 2024, in Hollywood, Florida.

CNN

Heavy rainfall has been inundating South Florida for a third day in a row on Thursday, with flash flood warnings in effect from Miami to Fort Lauderdale, after Wednesday’s storms transformed roads into canals and caused water to seep into homes.

Flash flooding is likely to occur at a faster rate than usual as the areas around Miami are already saturated from more than a foot of rain in the past two days.

Nearly 1.7 million people living in South Florida – including the cities of Hialeah, Aventura and Doral – are under a flash flood warning Thursday evening as a line of storms approach the Miami area and bring the potential to produce several inches of rain in a short period of time, according to the Miami-South Florida office of theNational Weather Service.

“Significant flash flooding (is) expected over urban areas, (with) locally catastrophic flash flooding possible,” the Weather Prediction Center warned earlier Thursday.

High risk days are exceedingly rare — happening on fewer than 4% of days each year on average — but account for more than 80% of all flood damage and more than a third of all flood deaths in the US.

More than 8 million people are under flood alerts Thursday, including Fort Lauderdale, Miami and Naples. Another 4 to 8 inches of widespread rain is expected through Friday, but it’s possible some spots record nearly a foot of rain.

A vehicle creates waves as it drives through floodwaters Thursday morning in the Miami metro.

Six to more than 20 inches of rain has deluged South Florida since Tuesday morning, prompting Florida Gov. Ron DeSantis to declare a state of emergency for Broward, Collier, Lee, Miami-Dade and Sarasota counties. While the state is no stranger to drenching rain, heavy rain events are getting even heavier as the world warmsdue to fossil fuel pollution.

Ongoing flooding resulting from past rainfall is one of the main reasons the flood risk is so high Thursday.

Floodwaters haven’t had time to fully recede and some communities in and north of the Miami metro remained underwater Thursday morning, aerial imagery showed.

That was the case in Hallandale Beach – located just north of Miami – where nearly 20 inches of rain had fallen, and some mobile home parks were still underwater, said Broward County Sheriff’s Office Fire Rescue Battalion Chief Michael Kane.

Severe flooding there on Wednesday covered cars up to their windshields, forcing some drivers to abandon their stalled-out vehicles and wade to safety. Others had to be rescued.

“We had to use our boats to rescue people standing on top of the roofs of cars,” Kane told CNN. Kane’s office received 175 calls for help in Hallandale Beach alone.

‘Catastrophic flash flooding possible’ with heavy rain falling on still-flooded South Florida | CNN (2)

People walk through a flooded street in Hollywood, Florida, on June 12, 2024.

Resident Kait Madrigal spent five hours stuck in her car Wednesday after it became suddenly surrounded by floodwaters on her way to work near Hollywood, Florida, she told CNN. She was able to park on the sidewalk to get to higher ground but began to panic as the water rose and cars began to stall out around her.

“If I was to open my car door, I would’ve just had a ton of water rushing in. I would’ve been out of luck big time,” the 25-year-old said.

After hours of unrelenting rain, Madrigal waded through the water and was able to find a possible exit route. Fearing she may become trapped all night, she drove out and was able to get home safely, she said.

Several local officials have warned against trying to drive through murky floodwaters and are urging storm-weary South Floridians to stay home. Most flood-related drownings occur when cars unknowingly drive into deep water, the Florida Department of Highway Safety said.

Fort Lauderdale, where the mayor declared a local state of emergency, received its entire average June rainfall of around 9.5 inches in just 24 hours Wednesday.

Miami International Airport and Fort Lauderdale-Hollywood International Airport led the nation with the most flights canceled or delayed Wednesday, with more than 1,200 disruptions. The air travel woes are expected to continue through the end of the workweek.

‘Catastrophic flash flooding possible’ with heavy rain falling on still-flooded South Florida | CNN (3)

A vehicle sits in floodwaters in Hollywood, Florida on June 12, 2024.

‘Catastrophic flash flooding possible’ with heavy rain falling on still-flooded South Florida | CNN (4)

Floodwaters surround a home on June 12, 2024, in Hollywood, Florida.

In Broward County, the severe storms prompted school officials to postpone the demolition of the MarjoryStonemanDouglas High School building where a gunman killed17 people in 2018.

Many South Florida residents had only just finished repairing their homes after catastrophic flooding in April 2023, only to find water lapping at their doorsteps Wednesday.

Anna Rysedorph, a resident of the Broward County neighborhood of Edgewood, prepared for the worst as water circled her ankles in her home.

“I put the dogs in, I’m all packed up. I pretty much got everything in bins and we’re ready to go,” Edgewood resident Anna Rysedorph told CNN affiliate WSVN Wednesday. “My husband’s like ‘Don’t panic, don’t panic,’ but you know, I’m not gonna be caught unprepared.”

Significant flood risk Thursday

Multiple rounds of torrential downpours fueled by a firehose of tropical moisture from parts of the Caribbean are drenching the southern Florida Peninsula on Thursday.

Friday will also be another drenching day for South Florida, even as the robust tropical moisture fueling the soaking storms slowly starts to shift out of the area. All told, multiple locations could end up with more than two feet of rain Tuesday through Friday.

Wet weather is likely to continue over the weekend, just not to the severity of the past several days. But even the light-to-moderate rainfall rates of typical June showers and thunderstorms could cause additional flooding issues and prevent ongoing flooding from receding.

If there’s any silver lining, it’s the rain is beneficial to areas suffering through drought. Half of Florida is experiencing abnormal dryness or drought conditions, with the worst drought centered in the bull’s-eye for the heaviest rain, according to theUS Drought Monitor.

CNN’s Sara Smart and Jamiel Lynch contributed to this report.

‘Catastrophic flash flooding possible’ with heavy rain falling on still-flooded South Florida | CNN (2024)

FAQs

Is flash flooding possible when persistent heavy rains fall? ›

Flash floods occur when heavy rainfall exceeds the ability of the ground to absorb it. They also occur when water fills normally dry creeks or streams or enough water accumulates for streams to overtop their banks, causing rapid rises of water in a short amount of time.

Does rain cause flash floods? ›

Flooding that begins within 6 hours, and often within 3 hours, of the heavy rainfall (or other cause). Flash Floods can be caused by a number of things, but is most often due to extremely heavy rainfall from thunderstorms.

Which areas in Florida are at the greatest risk of flooding? ›

Cape Coral and Port Charlotte lead the way among cities, where a combined 61,852 properties face previously unidentified flooding risk.

What are some signs that a flash flood is about to happen? ›

You may notice a stream starting to rise quickly and become muddy. Sometimes flood debris temporarily blocks the water flow upstream. When it breaks free the debris may release a “wall of water” downstream. You may hear a roaring sound upstream as a flood wave moves rapidly toward you.

Can floods happen during heavy rains? ›

Flooding typically occurs when prolonged rain falls over several days, when intense rain falls over a short period of time, or when an ice or debris jam causes a river or stream to overflow onto the surrounding area. Flooding can also result from the failure of a water control structure, such as a levee or dam.

What creates the worst flash flooding? ›

You will not always have a warning that these deadly, sudden floods are coming. Most flood deaths are due to FLASH FLOODS. Most flash flooding is caused by slow-moving thunderstorms, thunderstorms repeatedly moving over the same area, or heavy rains from hurricanes and tropical storms.

What is the difference between flooding and flash flooding? ›

Flooding is a longer term event than flash flooding: it may last days or weeks. Flash flood: A flood caused by heavy or excessive rainfall in a short period of time, generally less than 6 hours.

Where is flash flooding most likely to occur? ›

Areas most susceptible to flash flooding are mountainous streams and rivers, urban areas, low-lying area, storm drains, and culverts.

What locations are vulnerable to flash floods? ›

Densely populated areas are at a high risk for flash floods. Buildings, highways, driveways, and parking lots increase runoff by reducing the amount of rain absorbed by the ground. This runoff increases potential for a flash flood.

Where is the safest place from flooding in Florida? ›

When looking at hurricane, flooding and strong wind data, their research identified Ocala to be at less risk from coastal flooding than other parts of the state, making it a popular option for storm-weary home buyers.

Why is South Florida particularly prone to flooding? ›

Florida differs from other places prone to flash flooding because it is flat and doesn't have dry riverbeds or gullies that suddenly become raging torrents capable of washing away entire buildings. In Florida, the heavy rains can overwhelm drainage and pumping systems, leaving the water nowhere to go.

What part of Florida doesn't flood? ›

1. Leesburg. Leesburg, Florida is considered one of the safest places in the state when it comes to the risk of hurricanes. It has a hurricane and tropical storm score of zero and it also has a low flood score.

How to stay safe in flash flood? ›

What to do During a Flood Warning or Flash Flood Warning
  1. Do not walk through flowing water. Most drownings occur during flash floods. ...
  2. Remember the phrase “Turn Around, Don't Drown!” Don't drive through flooded roads. Cars can be swept away in only two feet of moving water. ...
  3. Do not drive around road barriers.

Are flash floods serious? ›

Flash flood hazards

Flash floods don't just happen quickly, they can also move quickly. It's these fast-moving currents of water that pose great danger to people and property. There's a lot of power in moving water. Flash floods can easily move at 9 feet per second, and that flow is strong enough to move a 100-lb rock.

Can you predict flash floods? ›

Forecasters can usually tell in advance when conditions are right for flash floods to occur, but there is often little lead-time for an actual warning. (By contrast, flooding on large rivers can sometimes be predicted days ahead).

What are the conditions that could cause a flash flood? ›

Most flash floods are caused by slow moving thunderstorms, thunder- storms that redevelop over the same area, or heavy rains from tropical storms and hurricanes. These floods can develop within minutes or hours depending on the intensity and duration of the rain, the topography, soil conditions, and ground cover.

What is the difference between a flash flood and a heavy rainfall? ›

The National Weather Service (NWS) says a flood is typically caused by rising water from a river or stream and can last for days or weeks. A flash flood, on the other hand, is typically the result of heavy rain and happens quickly — usually within three to six hours of heavy rainfall.

Which of the following scenarios is more likely to cause a flash flood than a slow onset flood? ›

Expert-Verified Answer. Option a, the sustained presence of a storm over a region, is more likely to cause a flash flood than a slow-onset flood. Flash floods occur when intense rainfall occurs over a short period, overwhelming the capacity of the land to absorb water or the river channels to carry it away.

How predictable are flash floods? ›

Forecasters can usually tell in advance when conditions are right for flash floods to occur, but there is often little lead-time for an actual warning. (By contrast, flooding on large rivers can sometimes be predicted days ahead).

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