Fallstreaks, often called “hole punch clouds,” occur when conditions in a mid-or-high level cloud deck consist of supercooled ...

[bitluni] took matters into his own hands and built this nifty DIY hole punch for light-gauge sheet metal. A little backstory will probably help understand why [bitluni] needs so many holes.

The clouds looked like someone had taken a hole punch to the sky. This unusual phenomenon isn't new. Researchers have been documenting it since the 1940s, according to NASA. But it wasn't until ...