Can you explain this?
Welcome to PF!
I'm not sure I'm following - I just see a cloud. What is the mystery? Are you referring to the fact that it repeatedly forms and then dissipates? It has to be fed and if it isn't fed by a steady stream of moist air, it will dissipate. Apparently, whatever is feeding that one is unsteady. See:
Like Russ, I don't see anything unusual
just clouds forming and disappearing, they do that all the time
I can only guess that the film maker considers it a mystery that he did not have to pan his camera to follow a horizontal movement of the clouds forming and disappearing. Perhaps he/she should reflect upon renaming the video to a less leading description.
Could be a cumulus cloud forming at the dew point of rising hot air from the ground (thermal up rising cumulus cloud) being kicked off by a region of rotor turbulence overhead which is found under some clear blue sky wave wind flow conditions.
Sorry this is hard to write on an iPad
On the following website look for the section 3 graphic.
Under the sections 3.Winds due to topographic barriers
I think the cloud is a cumulus being kicked up from the ground because of an overhead rotor air instability hence its stationary position, I think you can see the descending part of the cloud, it could be the actual rotor cloud but it doesn't have the right rotation in it which leads me to think it could be a vertical rising cumulus cloud leading into the uprising part of the rotor, all the usual overhead rotor and waves cloud cant seen because the conditions are not just right for further cloud formation.
We would use these thermals to gain height in a glider/sailplane, then climb into the rotor it is not to turbulent and then into the overhead wave.
I could easily be wrong as well.
Was there a large mountain upwind within 3-10 miles?
The fact the clouds come and go 3-4 times over 20 min in a stationary position means it's a wind flow driven phenomena and not the usual heat convection thermal/cumulus
weird that they all take the same rough shape
No mountain but there is large oil refinery nearby. I used to live a few blocks from the refinery and there were some weird atmospheric effects on occasion. (Along with the explosions and fires every few years.)
well there is a large hill area there on the coast
gosh, been a few years since my last visit to that area
well nothing unusual with that either
did you take this video ? if you did,
what direction were you facing ?
what is on the ground directly below the cloud formation area ?
Clouds forming and disappearing? Happens every day. There appear to be trees below the clouds. This could be due to evapotranspiration, combined with temperature changes. Without more context, its just guessing.
Well, the video is elapsed, which is why it looks like the cloud is appearing and disappearing almost immediately. If we all sat there to watch it happen, it definitely would not look like that. We probably would not have even noticed.
It's a cumulus type cloud, so it's being produced by warm air rising, probably from some heat source on the ground since the position is fairly constant.
There are hundreds of possible heat sources on the ground, a small forest fire or a factory chimney are two obvious ones.
These tend to happen sometimes I catch them forming visually it is just a single cloud that materializes then dissipates over and over. Yes you can see it happen even with real time. I sped it up to show how many times it continues. There isnt any factory over that area and if this is normal why dont we see clouds doing it right before our eyes. It would look pretty crazy seeing all the clouds doing this over and over. I stopped filming because it kept going.
Another mystery is the way it stayed in one place while other clouds kept moving. Ive seen this a couple times before and they tend to stay put when doing this. Why would the temperature in the air cause this to happen to just that cloud meanwhile the clouds around act normal and move along normally? Just wondering if anyone could bring some scientific facts of why.
No mountains and it actually did this about 13 times i caught on camera about 5
Ive seen these while other clouds are right around a cloud doing this. Qhy wouldn't the other clouds follow suit?
Nowhere near that one you refer to i used to live down the street from that refinery
So you're saying that clouds do that normally? That would look pretty peculiar because even I sped the video up it changed continuously. Imagine clouds acting like that all at once on a cloudy day people would definitely take notice as they disappear and reappear.
I did and it was north but ive also seen them while over city's like LA and while driving south over LA count areas
Cumulus type clouds usually do move with the general direction of the wind, taking along with them the uprising thermals which feed them.
A well established cumulus cloud is a self sustaining system so long as some amount of warm air is available at a low level to sustain it.
In this case the system is not self sustaining, it starts up then stops, then starts again in the same place , so it must have been produced by a localized hot spot on the ground, or as somebody said, an unusual wind circulation setup produced by local landscape features such as nearby hills
No with out elapsed time it changed immediately continuous. I sped ot up trying to show how many times it happened. It kept happening too actually my camera stopped taping memory ran out.
Separate names with a comma.