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![A group of snowflakes](https://cdn.mos.cms.futurecdn.net/YqrjdVGEDcShq3sM32pMhM-320-80.jpg)
How big can snowflakes get?
By Jennifer Nalewicki published
What is the largest snowflake ever recorded?
![Giant waves batter Santa Cruz Lighthouse point during the 2018-2019 El Niño event](https://cdn.mos.cms.futurecdn.net/teystD9pmzJNQFbx3vJCmk-320-80.jpg)
El Niño could unleash several '10-year flood events' this winter in cities such as Seattle and San Diego
By Ben Turner published
Climate change and rising sea levels could cause similar floods along the West Coast each year without El Niño by the 2030s, NASA warns.
![People visiting a lake at Death Valley](https://cdn.mos.cms.futurecdn.net/nCML3xqYugRqZcaA2BqxLQ-320-80.jpg)
Rare lake forms in Death Valley
By Jennifer Nalewicki published
There's still time to see a rare oasis that formed in Death Valley.
!["Traffic jams” of boats and floating houses on the dry bed of Lake Puraquequara, in the outskirts of Manaus.](https://cdn.mos.cms.futurecdn.net/ZAEs8N8hVSPwJ2mt5uki35-320-80.jpg)
Amazon's 'flying rivers' of vapor are drying up in an unprecedented drought. Here's how to save them.
By Lucas Ferrante published
A record drought, combined with a strong El Niño, is wreaking havoc on the Amazon. If steps aren't taken to curb illegal mining and deforestation, the ecosystem could collapse.
![The El Niño pattern stands out in the warm sea surface temperature anomalies in the Pacific in 2023.](https://cdn.mos.cms.futurecdn.net/XU6vkj5jds49gD5MiActhf-320-80.jpg)
A strong El Niño is coming this winter. What does that mean?
By Aaron Levine published
Thanks to El Niño, meteorologists are predict a snowy winter in the Rockies, storms and wet weather in the South and drier conditions in the Northwest and Uppder Midwest.
![Video footage of the the ozone hole opening above Antarctica during a simulation](https://cdn.mos.cms.futurecdn.net/TfFSdikRZEXoapsiRiY9TM-320-80.gif)
'One of the biggest on record': Ozone hole bigger than North America opens above Antarctica
By Harry Baker published
Satellite data shows that this year's ozone hole grew to around twice the size of Antarctica. Researchers say the eruption of Tonga's underwater volcano early last year may be partially to blame for the enormous cavity.
![Animation of ongoing progress of the 2023 El Niño event.](https://cdn.mos.cms.futurecdn.net/W2A66g8DzG322HSJ6vHNpn-320-80.gif)
What is El Niño?
By Aimee Gabay published
El Niño is a climate cycle in which waters off the tropical eastern Pacific are warmer than usual, which in turn affects global weather patterns.
![A map showing the projected path of Tropical Storm Lee.](https://cdn.mos.cms.futurecdn.net/fzemeJyvDzMNXgKJPS8DfW-320-80.jpg)
Tropical Storm Lee could become an 'extremely dangerous major hurricane' by this weekend
By Jennifer Nalewicki published
Forecasters are keeping an eye on Tropical Storm Lee, which they predict could soon become a full-blown hurricane in the Atlantic Ocean.
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