I Saw a “Fallstreak Hole” and It Blew My Mind: The Science Explained
The Hole-Punch Cloud
I was looking up at a thin layer of cirrus clouds when I saw a massive, perfect circle had been punched out of the cloud layer, with a trail of wispy clouds falling from the center. I thought it was a UFO. I learned it’s a rare and beautiful phenomenon called a “fallstreak hole.” It happens when a section of the cloud, which is made of supercooled water droplets, is disturbed (often by an airplane) and begins to freeze. The ice crystals then fall out of the cloud, creating the “hole” and the “fallstreak.” It’s a beautiful, natural chain reaction.
The 10 Basic Cloud Types and How to Identify Them Instantly
High, Middle, and Low
The dozens of Latin cloud names used to confuse me. I learned a simple system to identify them. You just have to know three main types—puffy “cumulus,” wispy “cirrus,” and sheet-like “stratus”—and three altitudes—high, middle (“alto”), and low. If you see a high, wispy cloud, it’s a “cirrus.” If you see a mid-level, puffy cloud, it’s an “altocumulus.” If you see a low, sheet-like cloud, it’s a “stratus.” This simple system allows you to instantly identify the vast majority of clouds you’ll ever see.
How to Predict the Weather Just by Looking at the Clouds
The Mares’ Tails and the Mackerel Sky
I learned an old sailor’s proverb that is surprisingly accurate for weather prediction: “Mares’ tails and mackerel scales make lofty ships carry low sails.” The “mares’ tails” are wispy cirrus clouds, and the “mackerel scales” are altocumulus clouds. Both of these cloud types are often the very first, high-altitude signs of an approaching warm front, which usually brings storms and precipitation. If you see these clouds in the morning, there is a very good chance it will be raining by the afternoon.
The Secret to Spotting Rare “Lenticular” Clouds
Look to the Mountains
I had always wanted to see a “lenticular” cloud—the smooth, lens-shaped, “UFO” cloud. I learned that they almost always form near mountains. They are created when a stable, fast-moving stream of air is forced up and over a mountain. As the air rises and falls in a wave-like pattern on the other side of the mountain, the moisture in the air condenses at the crest of the wave, forming the smooth, stationary, lens-shaped cloud. So, if you want to see one, the secret is to look to the lee side of a mountain on a windy day.
I Used a Cloud-Watching App to Identify Every Cloud for a Day
An Encyclopedia in My Pocket
I wanted to get better at identifying clouds. I downloaded a cloud identification app. For one whole day, every time I saw an interesting cloud, I would take a picture of it, and the app would use AI to identify it for me. It also provided information about the altitude, the weather it was associated with, and other interesting facts. It was like having a meteorologist in my pocket. By the end of the day, I was confidently identifying cumulus, stratus, and cirrus clouds on my own.
The Most Underrated Cloud Formation That’s Actually Beautiful
The Asperitas Undulation
I was outside after a thunderstorm when I saw the most incredible cloud formation of my life. The underside of the cloud deck was a dark, chaotic, turbulent mess of rolling, wave-like structures. It looked like a stormy sea, upside down in the sky. I learned this is a rare and relatively newly-recognized cloud feature called “Asperitas.” It’s a beautiful, dramatic, and slightly ominous formation that is a true treat for any dedicated cloud watcher.
Why Some Clouds Are White and Others Are Gray
It’s All About the Thickness
The color of a cloud is not about what it’s made of; it’s about its thickness and height. All clouds are made of the same water droplets or ice crystals. A thin cloud, like a cirrus cloud, is white because the sunlight can easily pass through it. A thick, dense cloud, like a storm cloud, is dark gray on the bottom because it is so thick and full of water droplets that it is effectively casting a shadow on itself. The grayness is just a measure of the cloud’s own shadow.
I Took a Time-Lapse of the Clouds and the Result Was Breathtaking
The Sky is an Ocean
I set up my phone on a tripod and took a time-lapse of the sky for a few hours on a day with puffy cumulus clouds. When I watched the video, I was mesmerized. The clouds, which seem so slow and static to the naked eye, were revealed to be dynamic, roiling, and alive. They bubbled up, drifted, and dissipated like waves in a celestial ocean. The time-lapse revealed the true, energetic, and ever-changing nature of the atmosphere that is happening all around us, all the time.
The “Pareidolia” Effect: Why We See Shapes in Clouds
The Brain’s Pattern-Seeking Engine
I’ve been seeing shapes in clouds my whole life—dragons, faces, animals. I learned that this phenomenon has a name: “pareidolia.” It’s the human brain’s powerful, hard-wired tendency to find meaningful patterns, especially faces, in random, ambiguous stimuli. It’s the same reason we see a “man in the moon.” It’s not that the cloud is a dragon; it’s that our brain is an incredible pattern-recognition machine that is constantly trying to make sense of the world, even in the random shapes of the sky.
The Best Time of Day for Dramatic Cloud Formations
The Golden Hour Glow
For the most beautiful and dramatic cloud watching, the best time of day is during the “golden hour”—the first hour after sunrise and the last hour before sunset. During this time, the sun is low in the sky, and its light has to travel through more of the atmosphere. This scatters the blue light, leaving only the warm, dramatic reds, oranges, and pinks. This warm light illuminates the clouds from the side, creating incredible texture, depth, and color that you just don’t see in the middle of the day.