Saturday, November 15, 2008

The Cold Front Comes In



Yesterday afternoon, the weather shifted in our area.



And with the cold wind came these so-very-interesting cloud formations. Triss said they were billow altocumulus clouds, and that the air was going up and down through them.

I cannot name clouds that easily, so I looked it up.

From The Book of Clouds by John A. Day:

Billow clouds are organized in parallel rows. These benign-looking rows are created when wind blows at highly varying speeds in layers just above and below the clouds. These winds result in very unstable air that can be a danger to pilots. Billow clouds are often seen with altocumulus and cirrocumulus.




Look at the abrupt edge of the formation! Amazing. We had to drive into town right after I took these pictures, and we examined the clouds all the way there. They looked even more spectacular as the sun set. Gradually, the rows filled in.

Happily, this unique cloud formation took place above our house the same week as Outdoor Challenge #39: Weather Challenge #1. We have been doing a quick snatch of nature study here and there for the last several weeks, rather than participate in the challenges, but I have wanted to get back into it. I guess this is our signal to begin again. :o)

Update: Triss' narration on the clouds here.

6 comments:

Barb-Harmony Art Mom said...

Wow, I have never seen those kinds of clouds before and they are so interesting.

Great timing!

Barb-Harmony Art Mom

Paige said...

How cool, I've never seen clouds like that, guess I need to be more observant! Thanks for sharing.

G.L.H. said...

Wow, I have to share this with my own Cloud Girl. Her cellphone is filled with cloud photos. I don't think we've ever noticed this kind! thanks for sharing.

--Barbara

B.A.M. said...

WOW!!!! Those clouds are amazing!!
Wonderful pics, Thanks for sharing!!

Katie said...

Thanks for the kind comments!

Barbara, isn't it funny how kids attach to certain things? My daughter is a cloud girl too. Ever since she learned about clouds as a young elementary student, she has been fascinated with them, and identifies them for us all the time.

:: jamie :: said...

Very cool photos! How great for the weather study!