The Stack Overflow podcast is back! Listen to an interview with our new CEO.

New answers tagged


There's not much context, but my guess is that this was a cavum cloud (a.k.a. punch hole or fallstreak), that was caused by an aircraft. The UK Met Office describe how these form: They form in clouds of supercooled water droplets, water below 0 °C but not yet frozen. These water droplets need a tiny particle, a nucleus, to freeze or to be cooled below -...


I think it could be artificially formed. The parallel background clouds are natural formations; I have seen such formations over Hereford so straight, extensive and parallel that they looked artificial, but weren't. However, the transverse cloud in your photo runs contrary to the natural airflow. One possibility is that an aircraft flew cross grain through ...


Maybe you can use infrared satellite images to get the cloud-top temperatures and estimate the height of them over vertical temperature profiles (e.g. radiosondes). But this ís just workingg for the clouds at the top. You can't see what's beneath them unfortunately.

Top 50 recent answers are included