World Weather Attribution
@wwattribution.bsky.social
Rapid attribution to uncover the influence of climate change on heatwaves, drought, wildfire, storms and floods.
August 14, 2025 at 4:59 PM
The countries were gripped by unusually hot weather from mid-July with temperatures above 30°C.
The persistent heat led to overcrowded and overheated hospitals, wildfires, algal blooms, a surge in drownings and reindeer sightings in urban areas seeking shade and relief from biting insects.
The persistent heat led to overcrowded and overheated hospitals, wildfires, algal blooms, a surge in drownings and reindeer sightings in urban areas seeking shade and relief from biting insects.
August 14, 2025 at 4:55 PM
The countries were gripped by unusually hot weather from mid-July with temperatures above 30°C.
The persistent heat led to overcrowded and overheated hospitals, wildfires, algal blooms, a surge in drownings and reindeer sightings in urban areas seeking shade and relief from biting insects.
The persistent heat led to overcrowded and overheated hospitals, wildfires, algal blooms, a surge in drownings and reindeer sightings in urban areas seeking shade and relief from biting insects.
Climate change made the relentless heatwave in Norway, Sweden and Finland about 2°C hotter and at least ten times more likely. Our latest study was published this morning.
“This event should be taken as another reminder that no country is safe from climate change” - @frediotto.bsky.social
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“This event should be taken as another reminder that no country is safe from climate change” - @frediotto.bsky.social
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August 14, 2025 at 4:55 PM
Climate change made the relentless heatwave in Norway, Sweden and Finland about 2°C hotter and at least ten times more likely. Our latest study was published this morning.
“This event should be taken as another reminder that no country is safe from climate change” - @frediotto.bsky.social
🧵
“This event should be taken as another reminder that no country is safe from climate change” - @frediotto.bsky.social
🧵
August 7, 2025 at 2:11 PM
Pakistan needs $40–50 billion a year to cope with extreme weather, but international adaptation finance is falling short. At COP29, wealthy nations pledged to raise global climate funding to $300 billion annually by 2035.
📷: Dean Calma
📷: Dean Calma
August 7, 2025 at 2:09 PM
Pakistan needs $40–50 billion a year to cope with extreme weather, but international adaptation finance is falling short. At COP29, wealthy nations pledged to raise global climate funding to $300 billion annually by 2035.
📷: Dean Calma
📷: Dean Calma
Pakistan’s monsoon season starts in late June and ends in September. It brings 70-80% of the country’s annual rainfall, but frequently causes flooding. In 2022, monsoon floods killed more than 1,700 people and caused an estimated $40bn in damages.
📷: Ali Hyder Junejo
📷: Ali Hyder Junejo
August 7, 2025 at 2:07 PM
Pakistan’s monsoon season starts in late June and ends in September. It brings 70-80% of the country’s annual rainfall, but frequently causes flooding. In 2022, monsoon floods killed more than 1,700 people and caused an estimated $40bn in damages.
📷: Ali Hyder Junejo
📷: Ali Hyder Junejo
Heavy monsoon rains have led to more than 300 deaths in Pakistan since late June. Climate change increased the downpours by about 15% 📈
Our latest study, focusing on the hardest-hit north of the country, was published this morning 🧵
Our latest study, focusing on the hardest-hit north of the country, was published this morning 🧵
August 7, 2025 at 2:06 PM
Heavy monsoon rains have led to more than 300 deaths in Pakistan since late June. Climate change increased the downpours by about 15% 📈
Our latest study, focusing on the hardest-hit north of the country, was published this morning 🧵
Our latest study, focusing on the hardest-hit north of the country, was published this morning 🧵
Unfortunately, this is not the first time we’ve come up with inconclusive results for extreme rainfall in a Global South country. Recent examples:
May, 2025 - Democratic Republic of Congo
June, 2024 - Afghanistan, Pakistan, Iran
June 2023 - Rwanda, Democratic Republic of Congo
📷:MONUSCO
May, 2025 - Democratic Republic of Congo
June, 2024 - Afghanistan, Pakistan, Iran
June 2023 - Rwanda, Democratic Republic of Congo
📷:MONUSCO
July 17, 2025 at 12:19 PM
Unfortunately, this is not the first time we’ve come up with inconclusive results for extreme rainfall in a Global South country. Recent examples:
May, 2025 - Democratic Republic of Congo
June, 2024 - Afghanistan, Pakistan, Iran
June 2023 - Rwanda, Democratic Republic of Congo
📷:MONUSCO
May, 2025 - Democratic Republic of Congo
June, 2024 - Afghanistan, Pakistan, Iran
June 2023 - Rwanda, Democratic Republic of Congo
📷:MONUSCO
Observational data shows trying trends for both countries, but with high uncertainties. Climate models were all over the place. Weather station data wasn’t available to validate the trends. The IPCC projects a range of changes in rainfall for the region, but with low confidence.
July 17, 2025 at 12:16 PM
Observational data shows trying trends for both countries, but with high uncertainties. Climate models were all over the place. Weather station data wasn’t available to validate the trends. The IPCC projects a range of changes in rainfall for the region, but with low confidence.
We looked at rainfall in two regions: the Colombian Andes and the Venezuelan Llanos.
Historical data showed that neither event was particularly rare. Today, the rain in Colombia can be expected every ten years, while in Venezuela, similar spells of heavy rain can be expected every three years.
Historical data showed that neither event was particularly rare. Today, the rain in Colombia can be expected every ten years, while in Venezuela, similar spells of heavy rain can be expected every three years.
July 17, 2025 at 12:15 PM
We looked at rainfall in two regions: the Colombian Andes and the Venezuelan Llanos.
Historical data showed that neither event was particularly rare. Today, the rain in Colombia can be expected every ten years, while in Venezuela, similar spells of heavy rain can be expected every three years.
Historical data showed that neither event was particularly rare. Today, the rain in Colombia can be expected every ten years, while in Venezuela, similar spells of heavy rain can be expected every three years.
Extreme rainfall hit Colombia and Venezuela in late June. One landslide near Medellín killed 27 people.
Our latest study couldn’t determine how climate change influenced the downpours. Why? A scarcity of data and poor model performance. 🧵
📷: Alcaldía de Bello
Our latest study couldn’t determine how climate change influenced the downpours. Why? A scarcity of data and poor model performance. 🧵
📷: Alcaldía de Bello
July 17, 2025 at 12:15 PM
Extreme rainfall hit Colombia and Venezuela in late June. One landslide near Medellín killed 27 people.
Our latest study couldn’t determine how climate change influenced the downpours. Why? A scarcity of data and poor model performance. 🧵
📷: Alcaldía de Bello
Our latest study couldn’t determine how climate change influenced the downpours. Why? A scarcity of data and poor model performance. 🧵
📷: Alcaldía de Bello
June 20, 2025 at 3:46 PM
Before humans burned vast quantities of oil, gas and coal, a day reaching 32°C in June would be extremely rare, expected only once every 2,500 years on average. Today, however, similarly hot days have become about 100 times more likely, occurring about once every 25 years.
June 20, 2025 at 3:46 PM
Before humans burned vast quantities of oil, gas and coal, a day reaching 32°C in June would be extremely rare, expected only once every 2,500 years on average. Today, however, similarly hot days have become about 100 times more likely, occurring about once every 25 years.
Before climate change, three hot June days over 28°C happened about once every 50 years. With 1.3°C of warming, it's now ten times more likely—around once every five years. June heatwaves are also 2 to 4°C hotter than they used to be.
June 20, 2025 at 3:45 PM
Before climate change, three hot June days over 28°C happened about once every 50 years. With 1.3°C of warming, it's now ten times more likely—around once every five years. June heatwaves are also 2 to 4°C hotter than they used to be.
Our analysis focused on a region of southeast England which uses a threshold of three consecutive days above 28oC to define heatwaves. We looked at the likelihood of the heatwave criteria being met in June and the chance of a single day in June reaching 32°C.
June 20, 2025 at 3:45 PM
Our analysis focused on a region of southeast England which uses a threshold of three consecutive days above 28oC to define heatwaves. We looked at the likelihood of the heatwave criteria being met in June and the chance of a single day in June reaching 32°C.
The heat above 32°C in southeast England tomorrow will be 100 times more likely due to fossil fuel-driven warming 🌡️📈
Our super rapid study was published this morning. It is just the second time we’ve studied an event in real-time, using forecast data. It's been hot work.
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Our super rapid study was published this morning. It is just the second time we’ve studied an event in real-time, using forecast data. It's been hot work.
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June 20, 2025 at 3:42 PM
The heat above 32°C in southeast England tomorrow will be 100 times more likely due to fossil fuel-driven warming 🌡️📈
Our super rapid study was published this morning. It is just the second time we’ve studied an event in real-time, using forecast data. It's been hot work.
🧵
Our super rapid study was published this morning. It is just the second time we’ve studied an event in real-time, using forecast data. It's been hot work.
🧵
For the full study ▶️ www.worldweatherattribution.org/climate-chan...
📷: Haukur Haraldsson, Icelandic Met Office
📷: Haukur Haraldsson, Icelandic Met Office
June 11, 2025 at 1:57 PM
For the full study ▶️ www.worldweatherattribution.org/climate-chan...
📷: Haukur Haraldsson, Icelandic Met Office
📷: Haukur Haraldsson, Icelandic Met Office
Greenland loses 43b tonnes of ice yearly. Just 1.5°C of warming could push its ice sheet past a tipping point, triggering meters of sea level rise and threatening low-lying islands. Melting ice also slows the AMOC, a key ocean current, risking major shifts in global weather.
📷:UN Photo/Mark Garten
📷:UN Photo/Mark Garten
June 11, 2025 at 1:57 PM
Greenland loses 43b tonnes of ice yearly. Just 1.5°C of warming could push its ice sheet past a tipping point, triggering meters of sea level rise and threatening low-lying islands. Melting ice also slows the AMOC, a key ocean current, risking major shifts in global weather.
📷:UN Photo/Mark Garten
📷:UN Photo/Mark Garten
The heat from May 15-21 corresponded with melting of the Greenland ice sheet that was about 17 times higher than average for this time of year, according to preliminary analysis of surface melt data from the National Snow and Ice Data Center.
June 11, 2025 at 1:55 PM
The heat from May 15-21 corresponded with melting of the Greenland ice sheet that was about 17 times higher than average for this time of year, according to preliminary analysis of surface melt data from the National Snow and Ice Data Center.
We also analysed data from the Ittoqqortoormiit station in eastern Greenland. The hottest day in May was about 3.9°C warmer than it would have been in the preindustrial climate. While this analysis did not include climate models, it's likely that almost all of the increase was due to climate change.
June 11, 2025 at 1:55 PM
We also analysed data from the Ittoqqortoormiit station in eastern Greenland. The hottest day in May was about 3.9°C warmer than it would have been in the preindustrial climate. While this analysis did not include climate models, it's likely that almost all of the increase was due to climate change.
On May 15, the Egilsstaðir Airport station in Iceland recorded 26.6°C, a new national record for May.
Just days later, on May 19, the Ittoqqortoormiit station in eastern Greenland reported 14.3°C, far above the monthly average of daily maximum temperatures of 0.8°C.
📷: Icelandic Met Office
Just days later, on May 19, the Ittoqqortoormiit station in eastern Greenland reported 14.3°C, far above the monthly average of daily maximum temperatures of 0.8°C.
📷: Icelandic Met Office
June 11, 2025 at 1:54 PM
On May 15, the Egilsstaðir Airport station in Iceland recorded 26.6°C, a new national record for May.
Just days later, on May 19, the Ittoqqortoormiit station in eastern Greenland reported 14.3°C, far above the monthly average of daily maximum temperatures of 0.8°C.
📷: Icelandic Met Office
Just days later, on May 19, the Ittoqqortoormiit station in eastern Greenland reported 14.3°C, far above the monthly average of daily maximum temperatures of 0.8°C.
📷: Icelandic Met Office
In mid-May, temperatures soared in Greenland and Iceland. Climate change made the record-breaking heat about 3°C hotter.
Our latest rapid study is a reminder that cold climate countries are also experiencing unprecedented heat and a warning that it is driving rapid ice loss ☀️🧊
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Our latest rapid study is a reminder that cold climate countries are also experiencing unprecedented heat and a warning that it is driving rapid ice loss ☀️🧊
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June 11, 2025 at 1:53 PM
In mid-May, temperatures soared in Greenland and Iceland. Climate change made the record-breaking heat about 3°C hotter.
Our latest rapid study is a reminder that cold climate countries are also experiencing unprecedented heat and a warning that it is driving rapid ice loss ☀️🧊
🧵
Our latest rapid study is a reminder that cold climate countries are also experiencing unprecedented heat and a warning that it is driving rapid ice loss ☀️🧊
🧵
May 12, 2025 at 5:10 PM
The analysis also investigated the hot seas in the Gulf of Mexico that fed moisture to the storm. Overall, climate change made the high surface temperatures 1.2°C hotter and 14 times more likely.
May 12, 2025 at 5:07 PM
The analysis also investigated the hot seas in the Gulf of Mexico that fed moisture to the storm. Overall, climate change made the high surface temperatures 1.2°C hotter and 14 times more likely.
We found the four days of spring rainfall was the heaviest ever recorded for the region analysed. A combination of weather patterns, including the collision of two air masses, created a storm that stalled and subjected the Central Mississippi Valley to days of severe weather.
May 12, 2025 at 5:05 PM
We found the four days of spring rainfall was the heaviest ever recorded for the region analysed. A combination of weather patterns, including the collision of two air masses, created a storm that stalled and subjected the Central Mississippi Valley to days of severe weather.