Imagine this: A place so arid, so parched, that it's often called the driest desert on Earth. Now, picture it blanketed in a layer of pristine white. That's exactly what happened in the Atacama Desert, Chile, earlier this year, a truly remarkable event captured by satellite imagery. This rare snowfall not only transformed the landscape but also caused a temporary shutdown of a powerful radio telescope. Let's dive in!
Quick Facts:
- Location: Atacama Desert, Chile
- What's in the photo? A rare snowfall covering parts of the driest desert on Earth.
- Satellite: Landsat 9
- Date: July 10, 2025
This stunning image showcases a unique moment when nature defied expectations. The Atacama Desert, known for its extreme dryness, received a dusting of snow. This event temporarily turned the barren, rocky terrain into a winter wonderland, a stark contrast to its usual parched appearance. Even more remarkably, this unusual weather briefly forced one of the world's most powerful radio telescopes into a 'survival mode'.
The Atacama Desert competes for the title of the driest place on Earth with other hyperarid locations, like Antarctica and the Sahara. Some areas of the Atacama receive as little as 0.002 inches (0.5 millimeters) of rain annually, according to Guinness World Records. To put this in perspective, some parts of the desert went nearly 400 years without recorded rainfall, from around 1570 to 1971.
On June 25, a rare snowstorm hit the Atacama. This event was caused by a 'cold-core cyclone' that unexpectedly drifted down from the north. According to NASA's Earth Observatory, this storm covered over half of the desert with snow. The satellite photo shows a section of the desert in the Chajnantor Plateau, which sits at around 16,000 feet (5,000 meters) above sea level. This area is home to the Atacama Large Millimeter/submillimeter Array (ALMA) observatory, an array of over 50 radio dishes used to study the universe.
This high-altitude, remote, and dry environment is ideal for astronomical research. However, the snowfall forced ALMA into 'survival mode,' meaning the dishes were repositioned to prevent snow accumulation, halting observations. The Southern Astrophysical Research (SOAR) Telescope, located about 530 miles (850 km) southwest of ALMA, may have also been affected, though to a lesser extent. The newly constructed Vera C. Rubin Observatory, situated near the SOAR telescope, was unaffected.
The snow didn't linger. Most of it had vanished by July 16. In some areas, the intense sunlight likely caused the snow to sublimate, turning directly from solid to gas, before it could even melt, according to the Earth Observatory.
But here's where it gets controversial... This isn't the first time snow has graced the Atacama. Similar events occurred in 2011, 2013, and 2021. Moreover, the region has seen several intense rain events in recent years, which can trigger deadly mudflows. In March 2015, heavy rainfall caused the Atacama's largest flood ever recorded, resulting in at least 31 fatalities.
Rain can also cause desert flowers, which usually bloom in spring, to unexpectedly bloom during winter months, creating vibrant displays. This happened most recently in 2024, after a surprise rain shower.
And this is the part most people miss... The Atacama's dryness is due to two main factors: the rain shadow of the Andes Mountains, which blocks clouds from the east, and cold ocean currents off the Pacific coast, which prevent water from evaporating. This harsh environment is inhospitable to most life, except for hardy desert flowers and extreme microbes.
Could this be a sign of climate change? Recent instances of extreme precipitation might suggest that human-caused climate change is making snow and rain more frequent in the Atacama. If this trend continues, the Atacama may eventually lose its title as one of the driest places on Earth.
What do you think? Is this a sign of climate change, or just a rare weather event? Share your thoughts in the comments below!
