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My apologies hygge, I wasn’t trying to asuage Jan’s confusion. imho, everything fallstreak in the photo is fallstreak. Fallstreak ,like Virga,falls, the difference being source. But an ice crystal is an ice crystal and they team up and get heavy and fall. I was making comment on my pic only, which spurred me to go back and check some data. I found some interesting info if any care to further eliminate any confusion.
Two pics below; The first is of the beginning of the cavum , photographed at 10:09a.m.. Obviously mature in that the fall is mature well developed ,and already the winds are having their way with it. The shot Above, looking West was taken at 10:50 a.m.. The 2nd shot below, looking East, was taken at 10:55a.m…So, it took apprx 40 minutes to propagate across the Valley.( est the plane took 3 minutes at most to traverse the same sky.).I wonder how close to scientific observation does that rate align? about 50miles to 60miles in 40 minutes..somewhere around 90miles an hour triggering rate?? I have no idea if that means anything or is close to fact.
Another thing of interest that has me slightly confused , occurring while discussing cavum and their source, of course airliners are not the only source to trigger the chain reaction of cold water turning to crystal and falling out of the sky. So heres the observation we mite take,,during our perusal of paintings and art from caveman to Rothko..how may recordings of cavum is there? There are lenticularus in medieval works of art ( thx to GPP for pointing that out in the CG) We have Couch and Tate etc for more modern takes of the sky. And the recent Surrealists to Post Modern to whatever ,have some kind of representation of the sky. Fallstreaks anywhere? In other Arts, there are many references to Angels and their feathers( the beginning of Beethoven’s Leonora..?).but in the visual arts, It may interesting to see when man first started recording the sight of a cavum as a cavum.
Nice Capture Keelin! Its an amazing thing to witness when a whole sky goes wild like that.
on a slightly more civil note..
Cloud Moon or Moon Clouds
Arizona B&W#168
Jan, Greetings! Fallstreak , Cavum, is the cloud of the month so allow me to continue what you’ve started here.
Heres a shot of a cavum that stretched from one end of the Valley (west) to the other ( yes, east). It was over the north side of the Valley, exactly where many a jetliner can be seen thru out the day. So its a safe assumption this cavum was created by a jetliner stretching 50-60 miles thru the altocumulus.
Keelin..Thats the thing about clouds,,you have to always be looking up to see them.
Arizona Color#97
Arizona Asperitas#124
Cumulus forming around Red Mountain is pulled up by the overhead passing of Asperitas.
Its good to hear clouds have returned to your skies Keelin. Monsoon season seems to have lost its pump here. Geesh a week without cloud after daily build up of nimbus leaves me befuddled. Historically one more Nimbus blast around mid Sept happens so heres hoping as long as its nothing like Florence. Yea, weather here never hangs around for long.
Arizona B&W#166
Good One Keelin! Ha!
Hans The shot got the bottom cut off in order to fit. Some of the sidewalk , the foot of the near lampost, etc had to go. That also threw off the proportional curve leading the eye to the lenticularus but thats minor compared to the clouds themselves. I guess I am one of those who likes everything in a picture doing something. If its not doing something get it out of the shot.
Arizona Color#95
