Australians on Wednesday were treated to a bizarre sight in the sky: a fallstreak hole, which forms from droplets in the cloud that are below freezing, but haven’t yet frozen.
Here’s how NOAA explains the formation: “These ‘supercooled’ water droplets need a ‘reason’ to freeze, which usually comes in the form of ice crystals. Planes passing through the cloud layer can bring these ice crystals. Once the ice crystals are introduced, the water droplets quickly freeze, grow and start to fall. A hole is left behind, which will start to expand outward as neighboring droplets start to freeze.”
Check out these photos from Australian cloud watchers via Twitter, and a report about a similar formation seen earlier in the week over Iowa.
Click here to read more.
SOURCE: Discovery News
The Washington Post