Questions tagged [clouds]

In meteorology, a cloud refers to a visible group of liquid droplets and/or frozen crystals made of water or various chemicals, suspended in the atmosphere.

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How are global cloud cover estimates generated and how is the data accessed?

The website ventusky.com offers three models to produce cloud estimate: ICON, GFS and GEM. They extract a fractional cloud number, shown in percentage. From the ERDDAP portal to the GFS model (...
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Is there scientific consensus on the existence of the iris effect

Question: Is there scientific consensus on the existence of the Iris Effect and whether it is a positive or negative feedback mechanism? If so, can you refer to a recent publication? Background: In ...
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How high could snow form on a mountain?

I was reminded recently of a moment in the Eragon books where the main characters see a "tall" mountain range, and then after a minute realize that the white sky stretching up above them is just ...
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Roughly what proportion of a cloud does 'rain out'?

What proportion of the water in a cloud will 'rain out'? Or, comparing the cloud before and after it has rained, what proportion of the water is left afterwards? I really have no idea so am just ...
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Are clouds more common at night?

Clouds obviously have a strong effect on surface temperatures. By blocking sunlight they can decrease the temperature by several degrees. At night they have a blanket effect that traps warm air and ...
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What software for cloud motion forecasting

I have a large sequence of images in .png (10 second resolution) from sky image system. Is there any inexpensive software for processing images and forecasting cloud motion? I have found out that ...
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What factors influence cloud height and type?

For example, why do altocumulus clouds fail to form at 6400m in high latitude locations, but will form at this height at a lower latitude? Is it simply an issue of temperature?
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Is it natural for clouds to flow near the surface?

A week ago, I have seen something that I have never seen before, Nah it's not a flying dragon, but clouds that were flowing so near my roof (about 5-6 meters above my roof). These are the pictures, I ...
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Where did clouds obscure the American eclipse of August 2017?

Emphasis here is did. I'm trying to find a source that will inform me about which locations in the United States actually had their view of the eclipse on Aug 21, 2017 obscured by clouds. I'd ...
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How to output slope parameter and shape parameter in WRF?

I'd like to ask if it's possible to output slope parameter and shape parameter of cloud hydrometeors in WRF? I'm calculating cloud effective radius and I'm using the formula found in Morrison scheme ...
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125 views

Cloud in a bottle experiment. Why does the “cloud” get thicker with repeated squeezing?

I have done the cloud in a bottle experiment (Youtube video) with a thermometer probe in the bottle to show the temperature increase and decrease. I am interested in the nature of the changes as the ...
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Equilibrium condition for Kelvin's Vapor Pressure-curvature equation

This is regarding the Correction due to 'Curvature of the drop' made by Lord Kelvin to the Clausius-Clapeyron Equation. So, the idea is that, during large scale nucleation of water vapour into cloud ...
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Do clouds always move?

Can a cloud ever be stationary with respect to the ground surface? For some reason (experience, logic?) it seems to me such case is not possible. I read that stationary fronts are defined as two air ...
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Why are Nowcasting SAF daytime products apparently truncated at solar angles of 20° (rather than the documented 10°)?

This image shows the Nowcasting Satellite Application Facility (NWCSAF) Cloud Liquid Water Path (LWP) product for 2020-01-08T12:00:00Z: Cloud LWP from NWCSAF. Source: NWCSAF. The Algorithm ...
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What causes this cloud formation?

This was taken about November 18 in southern Arizona, USA. I’ve never seen any clouds like this before. Is it natural or caused by some airplane?
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Tower cumulus clouds without lightnings

Is there any possibility to have tower cumulus (or cumulonimbus in worst case) without lightnings? And if this is happen what is the factor that cause this phenomenon?
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Do surface temperatures at lower latitudes continue to correlate with frequency of noctilucent clouds in the arctic stratosphere?

I saw this image in this answer to the question Noctilucent clouds and anthropogenic climate change which was listed as related to the question “New” cloud types: Can they be used as markers for ...
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Short-term forecast of Europe by using synoptic charts

I should make a short-term forecast of Europe by using synoptic charts. I'm finding it really hard so I'd be glad if you help me. 'В' means high atmospheric pressure I'm trying to figure out the ...
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Is there a real time tool to monitor electric flow in the clouds?

I was wondering if there is a tool that shows electric charge in the clouds. Something like this, but more detailed.
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Pileus / velum & altocumulus / altostratus - classification problems

I have a lot of free time and often observe and take photos of the sky. Along with that, I always try to figure out what exactly I saw. I think that I have the basic understanding of clouds and cloud ...
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Does the Nasa video show proof of the biotic pump theory?

(Edited). Biotic pump theory (2006): Forests cause enhanced transpiration and precipitation and create areas of low pressure that suck in more moisture in a positive feedback loop. A few years ago an ...
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From where we get the observed cloud liquid water content data

I want to study the clouds and its profile which requires some basic observed variables, does anyone knows how and from where we can get the observed liquid water content data.
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Can airplanes trigger rain?

A lady was telling me that the lower clouds were contrails left from plane exhausts. I looked up and there were none I could see in the sky she pointed to Stratocumulus Clouds. I did not want to tell ...