Forsythia bush: Empty bird feeder: Archway hearts: Thornless blackberries: Thornless blackberries: Blackcurrants: Not sure (a small wonderberry?): Not sure: Tomato cage: Bushes: Climbing rose: Grapevines: Grapevine: Grapevine: Grapevines:

Looks cold, but must say impressively cool patterns. Never see anything like that here

Whwoz wrote: ↑Thu Dec 05, 2024 1:42 am Looks cold, but must say impressively cool patterns. Never see anything like that here

It wasn't too cold. Maybe 18 to 20-something degrees Fahrenheit. This is the first time I've seen frost like this, too, I think. Usually the frost doesn't have thorns, and it covers the ground, too.

Oh wow, just beautiful @Shule !
The frost was super thick here this morning after -9C, but I've never seen anything like the frost-fur in your pics!!

Not as impressive as the close up frost crystals, but coming home from town a while ago I had to make a stop along our township road and take a picture of the tree frost over the small lake.

Wow, amazing and interesting photos, @Shule!

It might be called needle frost. I'm not sure.

We've had an air stagnation advisory and some mild fog lately. I don't know if it's related.

Shule wrote: ↑Fri Dec 06, 2024 5:59 pm It might be called needle frost. I'm not sure.

We've had an air stagnation advisory and some mild fog lately. I don't know if it's related.

If it was foggy the night this frost formed, most likely what you saw is "rime ice." If it was clear that night, it probably was "hoar frost." We've always called that shaggy-looking frost "hoar frost" regardless of conditions, but apparently the meteorologists are more specific because one is formed by water droplets freezing and the other is formed by water vapor freezing.

Haven't heard the word 'rime' for awhile, but at one time it was commonly used here to describe the ice accretion on the rigging of boats. Not surprising that it affects airplanes as well. I didn't know how it was distinct from 'hoar' frost, that's very cool.