Have you ever seen a cloud that appears to have rain falling from it that disappears before reaching the ground? That’s what meteorologists call virga. The word virga comes from Latin and means “twig” or “branch.” Virga forms in conditions where the air is dry, and often warm. When there’s a layer of drier, warmer air near the ground, the precipitation falling from the cloud above will evaporate before hitting Earth. Some of the places you’re more likely to see virga are in deserts, at high altitudes, in the western U.S. and Canadian prairies, the Middle East, Australia and North Africa. But virga can happen anywhere when the conditions are right.
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Virga on radar
Sometimes, when you’re looking at your weather app, you might see what looks like rain or snow on the radar, but nothing is falling outside. Instead, look up at the clouds and see if you can spot virga. The radar is picking up precipitation in the air which is just not reaching the ground. As weather.gov says:
The radar isn’t lying, rather, the the rain or snow is not hitting the ground. If you have a dry air mass in place in the low levels, sometimes rain cannot completely penetrate that dry layer before it evaporates.
Do you want to learn to identify virga when you see it? Check out the photos on this page from our global EarthSky community. Once you acquaint yourself with the variations of virga, you’ll be able to spot it in your own sky. If you capture a photo of virga, submit it to us!
Photos of virga from EarthSky’s community
More photos
Bottom line: Learn what virga is and how it forms, and see great photos to help you learn how to identify it yourself!
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Deborah Byrd
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About the Author:
Deborah Byrd created the EarthSky radio series in 1991 and founded EarthSky.org in 1994. Prior to that, she had worked for the University of Texas McDonald Observatory since 1976, and created and produced their Star Date radio series. Today, she serves as Editor-in-Chief of this website. She has won a galaxy of awards from the broadcasting and science communities, including having an asteroid named 3505 Byrd in her honor. In 2020, she won the Education Prize from the American Astronomical Society, the largest organization of professional astronomers in North America. A science communicator and educator since 1976, Byrd believes in science as a force for good in the world and a vital tool for the 21st century. “Being an EarthSky editor is like hosting a big global party for cool nature-lovers,” she says.
Kelly Kizer Whitt
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About the Author:
Kelly Kizer Whitt has been a science writer specializing in astronomy for more than two decades. She began her career at Astronomy Magazine, and she has made regular contributions to AstronomyToday and the Sierra Club, among other outlets. Her children’s picture book, Solar System Forecast, was published in 2012. She has also written a young adult dystopian novel titled A Different Sky. When she is not reading or writing about astronomy and staring up at the stars, she enjoys traveling to the national parks, creating crossword puzzles, running, tennis, and paddleboarding. Kelly lives in Wisconsin.