9 Comments
User's avatar
Jim Bergquist's avatar

Interesting, Jessica. You can search for the term compressional heating. The usual situation is: As a cold front approaches, it compresses the air ahead of it, giving warm temperatures for a while, in advance of the cold air. Also called adiabatic heating. A science experiment illustrates it: Piece of cotton in a test tube with a sliding piston. Make the piston go down very quickly, the air inside gets hot enough to ignite the cotton.

Jessica's avatar

I'll look into it. :)

Joanne Firth's avatar

Thank you!

Jessica's avatar

Hope it helps!

Joanne Firth's avatar

You know it will!

🖤

Anthony's avatar

I print out your information posts. I’m that slow, lol. But, I’m learning stuff so that’s okay. 👍🏻

Jessica's avatar

Cool. :) I'm also putting these posts into the second version of the guide so they'll be nice and organized.

Jessica Hetherington's avatar

You are brilliant. THANK YOU AGAIN for doing this research for the rest of us.

In October 2024 where I live in Ottawa Ontario, we were outside in the garden and suddenly noticed the sky. It was absolutely covered by the strangest low-lying dark grey clouds. I'm in my 50s and had never seen it before in my life. I was really creeped out. (I forget now what they were, and they were harmless that day, but still.) Just looked them up: "The clouds are known as Undulatus asperitas, an uncommon and unique cloud so named after the Latin word for roughness." Check out the pictures online. Just like I took on my phone!

John A. Jaksich's avatar

Smart post—nicely done!