Unprecedented Rainfall Event

When meteorologists warned that Hurricane Erin’s moisture could fuel heavy rainfall in Northwest Africa, few imagined just how devastating it would become. In just five hours, the island nation of Cape Verde measured 192.3 mm of rain—an amount equal to nearly six months of typical rainfall compressed into a single morning. Streets turned into raging rivers, entire hillsides collapsed under the weight of water, and the nation’s fragile infrastructure was left reeling.

Neighboring Senegal was also struck, receiving 152 mm in just 24 hours. In a region where average monthly rainfall rarely approaches such totals outside of peak monsoon bursts, this deluge pushed drainage systems and river channels far beyond their capacity.

Human Tragedy: Deaths and Destruction

At least 9 people have died across Cape Verde and the island of São Vicente, victims of flash floods, collapsing homes, and landslides triggered by the torrential downpour. Rescue teams worked through the night, often with nothing more than ropes and improvised rafts, pulling survivors from flooded homes. Roads across São Vicente were ripped apart, and entire fishing villages found themselves isolated.

Eyewitnesses describe cars being swept like toys, while marketplaces—usually the vibrant centers of daily life—were submerged under brown, churning water.

Meteorological Context

The source of this catastrophic rain lay in Erin’s vast moisture plume. While the hurricane itself roared westward in the Atlantic as a Category 5 giant, its outer bands and tropical convergence zone reached into Africa’s western coast. This interaction with local topography—volcanic islands in Cape Verde and low-lying plains in Senegal—enhanced rainfall rates to staggering extremes.

Meteorological data revealed:

• Cape Verde (Praia): 192.3 mm in 5 hours, peak rate over 60 mm/hour.
• São Vicente: 138 mm in 12 hours, leading to landslide activity on steep slopes.
• Senegal (Dakar): 152 mm in 24 hours, worst August storm in decades.

The combination of saturated soils from earlier rains and blocked drainage turned what could have been manageable flooding into a lethal event.

Broader Impacts on NW Africa

Agricultural regions have been badly hit. In Senegal, rice fields and peanut farms were inundated just as harvests were beginning, threatening food supplies. In Cape Verde, where agriculture already suffers under arid conditions, the flooding washed away topsoil and destroyed terraced fields built into the mountainsides.

Airports in Praia and São Vicente were temporarily closed due to flooded runways, delaying aid shipments and stranding passengers. Electricity outages were widespread, as transformers were submerged or knocked out by mudslides.

Climate and Vulnerability

Events like this underscore the growing vulnerability of West Africa to extreme weather. While hurricanes rarely strike directly, their moisture can interact with African monsoons, unleashing catastrophic rainfall. Climate scientists warn that warming seas and shifting weather patterns may increase the frequency of such extremes—forcing coastal and island nations like Cape Verde to adapt quickly or face repeated disasters.

Looking Forward

Authorities in Cape Verde and Senegal have begun recovery efforts, but with lives lost and infrastructure shattered, it will be a long process. Meteorologists continue to track Erin’s moisture plume, which could fuel more heavy rain further north in Morocco or Algeria.

For now, the people of Northwest Africa face the aftermath of a storm whose face they never saw directly, but whose rains brought devastation all the same.

Illustration picture: The Informat / Scott X

#Erin had earlier drenched West Africa with torrential rains

In #Cape Verde up to 192.3mm of rain fell in 5 hours in Sao Vicente island (average YEARLY is 116mm!) on Monday

In #Senegal on Friday 152mm at Tambacounda and 77mm at Dakar,short of the 232mm in 24 h. record in 1932 https://t.co/dfQohz4DSX

— Extreme Temperatures Around The World (@extremetemps) August 17, 2025

Unfortunately, #97L (soon-to-be #Erin) has caused five deaths and significant flood damage in the Cape Verde Islands.

📸 Inforpress pic.twitter.com/o9h7GgYocS

— Dylan Federico (@DylanFedericoWX) August 11, 2025

Cape Verde – Torrential Overnight Rains (Aug 11) Leave 7 Dead and Many Missing on São Vicente After Tropical Storm Erin Dumps 163 mm of Rain in One Hour; State of Emergency Declared. 🇨🇻 pic.twitter.com/9WNqQLSBhq

— Weather Monitor (@WeatherMonitors) August 12, 2025

❗️🌀🇨🇻 – Tropical Storm Erin caused devastating flooding in São Vicente, Cape Verde, killing at least seven people after 163 mm of rain fell in one hour.

The storm damaged infrastructure, swept away vehicles, and left several missing, prompting ongoing rescue efforts. Cape… pic.twitter.com/bIqgKDb8cL

— 🔥🗞The Informant (@theinformant_x) August 11, 2025

Putting aside the current atmospheric steering… What are the chances a storm like #erin hits the US starting from its current position (red TS symbol on bottom right) on the north side of the Cape Verde Islands?
Answer: Low (purple) less than 10%, based on historical… pic.twitter.com/5taea9t9F1

— Jeff Berardelli (@WeatherProf) August 11, 2025

At least eight people have died on Cape Verde’s Sao Vicente Island, due to flooding from Tropical Storm Erin.
Over a years worth of rain (116mm) fell in just five hours (193mm). pic.twitter.com/LNcRIfVlbm

— Scott (@RandomHeroWX) August 13, 2025

Erin destroyed parts of São Vincente and Santo Antão islands in Cape Verde. https://t.co/LkTxLUJxfk

— Someone, Somewhere (@CapobiaNB) August 17, 2025

NEW: Another tropical wave is exiting the coast of Africa near Senegal and The Gambia, and could pose an issue in 7-10 days.

This system (IF it develops) could track south of Erin, and therefore has a better chance of impacting land. pic.twitter.com/aSQbxROaQM

— MyRadar Weather (@MyRadarWX) August 16, 2025

Tropical Storm Erin formed just a few hundred miles west of Senegal on the African continent and is headed across the Atlantic.

Meteorologist Myles Henderson says by Saturday, forecasts show it picking up speed near the Caribbean islands. https://t.co/4RwuJy0vvo

— WTKR News 3 (@WTKR3) August 11, 2025

The latest on the tropical wave approaching the Cabo Verde islands off the coast of Senegal has this system 80% likely to develop over the next week, most likely midweek. Next name is #Erin. pic.twitter.com/VgKNJ2lcGP

— Jordan Darensbourg (@JDarensbourgWx) August 10, 2025