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Interesting seeing the different comments on the London cloud.To me they are clouds that are common and can be seen in any season. They typically appear after rain, and are quite different to the type of towering cumulus that develops in clear sky conditions.
Interesting seeing the different comments on the London cloud.To me they are clouds that are common and can be seen in any season. They typically appear after rain, and are quite different to the type of towering cumulus that develops in clear sky conditions.
We see Cb at any time of year, but they are obviously more common between March-October. We've had supercell storms in winter before, but they normally only occur a few times a year in the whole of southern or central England!
Interesting seeing the different comments on the London cloud.
It sure is.
Not sure some know that you need "WARM" air at the surface for a "RISE" of the air. The warm rising air cools aloft and condensates. The moisture keeps the inside of the cloud warm as the air around it way up there in the atmosphere is cooler. This keeps the air "UNSTABLE" and so the clouds continues "VERTICALLY".
You don't get rising air with cool air at the surface. Higher dewpoints also fuel it.
Not sure some know that you need "WARM" air at the surface for a "RISE" of the air. The warm rising air cools aloft and condensates. The moisture keeps the inside of the cloud warm as the air around it way up there in the atmosphere is cooler. This keeps the air "UNSTABLE" and so the clouds continues "VERTICALLY".
You don't get rising air with cool air at the surface. Higher dewpoints also fuel it.
It doesn't need to be that warm and humid though, with London reaching 16C and a dewpoint of 8C on the day of those photos.
The clouds to me look like classic after rain cumulus, where a rainfall has occurred and warming soon produces low level cumulus (10000ft) I don't associate them with thunder.
Those photos don't look like thunderstorm convection cloud that I'm used to seeing, as they form in clear skies only.
It doesn't need to be that warm and humid though, with London reaching 16C and a dewpoint of 8C on the day of those photos.
The clouds to me look like classic after rain cumulus, where a rainfall has occurred and warming soon produces low level cumulus (10000ft) I don't associate them with thunder.
Those photos don't look like thunderstorm convection cloud that I'm used to seeing, as they form in clear skies only.
These clouds eventually became thunderstorms and dropped heavy rain and hail. At the time I took the pictures, they had only just started producing rain. Later on in the afternoon, a LP supercell moved across Devon towards Bristol, lasting 6 hours.
Cambium said he usually sees those clouds with temps at or above 65f. It was around 63-65f across the SE when those pics were taken, so not surprising.
It doesn't need to be that warm and humid though, with London reaching 16C and a dewpoint of 8C on the day of those photos.
The clouds to me look like classic after rain cumulus, where a rainfall has occurred and warming soon produces low level cumulus (10000ft) I don't associate them with thunder.
Those photos don't look like thunderstorm convection cloud that I'm used to seeing, as they form in clear skies only.
You do not get rising air with cool surface air. That's arguing against science.
Look at the photo again and you'll see "blue" in the skies. Those are convective. And unless you have different meaning for Cumulonimbus as well, those are Thunderstorm clouds.. You don't need clear skies for them to form, although that does help when the sun "WARMS" the surface which helps create more instability.
Am I saying it NEVER happens in winter or below 65F? NOPE. Especially in southern Latitudes. But its a Spring/Summer look because thats when it happens most.
Also... not all Cumulonimbus convective clouds form thunderstorms. Sometimes the ingredient wasn't enough to produce the thunder, lightning and downpours and the clouds just collapse or hit pockets of dry air.
Quote:
Originally Posted by B87
These clouds eventually became thunderstorms and dropped heavy rain and hail. At the time I took the pictures, they had only just started producing rain. Later on in the afternoon, a LP supercell moved across Devon towards Bristol, lasting 6 hours.
Cambium said he usually sees those clouds with temps at or above 65f. It was around 63-65f across the SE when those pics were taken, so not surprising.
Mid 60s. Close enough. Is there a discussion around from a weather service that day or forecast? Anyway... seen some interesting comments lately on this matter..
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