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Home Science & Environment Environmental Policies

From deluges to drought: Climate change speeds up water cycle, triggers more extreme weather

March 24, 2025
in Environmental Policies
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From deluges to drought: Climate change speeds up water cycle, triggers more extreme weather
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Prolonged droughts, wildfires and water shortages. Torrential downpours that overwhelm dams and cause catastrophic flooding.

Around the globe, rising temperatures stoked by climate change are increasing the odds of both severe drought and heavier precipitation that wreak havoc on people and the environment.

Rainfall can disappear for years only to return with a vengeance, as it did in California in 2023, with record-setting rain and snowfall. That led to heavy vegetation growth that provided fuel for the devastating January wildfires in Los Angeles after drought returned.

But how can global warming cause both drier and wetter extremes? Here’s what experts say.

It’s all about the water cycle

Water constantly moves between the Earth and its atmosphere. But that system — called the hydrological cycle — is speeding up as global temperatures get hotter, primarily due to the burning of fossil fuels like coal and gas.

A hotter atmosphere sucks up more water vapor from bodies of water and vegetation and soil.

Over land, this atmospheric demand and loss of surface moisture leads to longer and more intense droughts, even causing some arid areas to expand. Though rain falls less often, when it does, it’s often in intense and destructive deluges.

That’s because the atmosphere holds 7% more water vapor for every degree Celsius.

“Basically, global warming is turning the atmosphere into a bigger sponge so it can soak up more moisture … and then when the conditions are right for rainfall, it’s like squeezing that sponge,” said Jonathan Overpeck, a climate scientist at the University of Michigan. “You get more moisture coming out faster.”

Oceans play outsized role

Oceans absorb most of the planet’s extra heat. That causes the water to expand and ice to melt at the poles, raising sea levels. The warmer water also provides fuel for larger hurricanes and cyclones that can dump massive amounts of water in a short time.

In 2023, for example, heavy one-day rains from Mediterranean storm Daniel caused massive flooding across eastern Libya that overwhelmed two dams, sending a wall of water through the coastal city of Derna that destroyed entire neighborhoods and swept bridges, cars and people out to sea. Climate scientists say climate change made that storm far more likely.

Snowpack is diminishing

Climate change also is affecting snowpack, a critical part of the hydrological cycle.

Melting snow helps fill reservoirs and waterways, including for drinking and agriculture. But less snow is falling in general, and what does often is absorbed by thirsty soil.

What’s more, because winters are becoming warmer overall, the growing season is longer, meaning snowmelt also is being lost through evapotranspiration of plants. But, just like rain, climate change also can cause more intense and sometimes damaging snowstorms.

“All this stuff is related to warming, which we know with perfect confidence is almost all due to human activity,” Overpeck said. “The good news is, we know how to stop it if we want to.”

___

Follow Webber on X: @twebber02 or Bluesky: @tjwebber.bsky.social

___

The Associated Press’ climate and environmental coverage receives financial support from multiple private foundations. AP is solely responsible for all content. Find AP’s standards for working with philanthropies, a list of supporters and funded coverage areas at AP.org.

TAMMY WEBBER.

DONAVON BRUTUS.

Tags: changeClimatecycledelugesdroughtExtremespeedstriggerswaterweather
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