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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What factors influence cloud height and type?

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 ...
Araleigh Maureen Cranch's user avatar
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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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Are clouds aerosol?

I recently came across a science writer's page according to which clouds are liquid water. I pointed out to this author that in reality clouds are made up of a dispersion of water micro-droplets in a ...
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Formation of Clouds in High Pressure Systems (Western Australia - Perth)

High pressure systems are normally correlated with stable atmospheric conditions with little to no cloud cover, but due to this minimal cloud cover, doesn't that open up the ocean / ground moisture to ...
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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 ...
Joscha Fregin's user avatar
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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 ...
Skyler's user avatar
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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 ...
Tom's user avatar
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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 ...
Joseph's user avatar
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Why atmospheric temperature lapse rate doesn't have a discontinuity at 0°C when ice is formed?

When trying to calculate the adiabatic lapse rate of moist air based on known values of basic thermodynamic properties of the constituents (ice, water, vapor,...) I came to the following question: ...
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What is the name and effect behind this circular cloud phenomenon?

The picture of this cloudy sky was taken today in Hamburg, Germany. Any idea, what it is, where it comes from and if it has a special name?
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Estimating longwave radiative forcing from clouds from direct/diffuse shortwave components

I am trying to estimate the downward longwave forcing from clouds. I have in-situ measurements of the direct and diffuse components of the incoming shortwave radiation, and I also have the top-of-...
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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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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 ...
theforestecologist's user avatar
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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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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 ...
Brian White's user avatar
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Drawing the cloud cover bar of Skew-T plot

I'm trying to display cloud cover info by altitude from sounding data in a compact widget of an app for free-flight pilots. It's basically the vertical bar showing different shades of gray according ...
nandilugio's user avatar
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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 ...
Mihir Neve's user avatar
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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 ...
luchonacho's user avatar
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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?
Thom Blair III's user avatar
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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?
liontass's user avatar
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Is the air temperature usually below the dewpoint above the top of a cloud?

Rising from the ground in an airplane, I fly into the bottom of a cloud. I can explain the bottom of the cloud as air temperature (which decreases with altitude) being decreased to the dewpoint. I fly ...
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Is it cold or hot on top of a tropical cyclone?

So I know that cloud tops of the thunderstorm in a tropical cyclone can reach -80 degrees Celsius according to infrared satellite imagery. Is the temperature of the air above the storm's eyewall ...
mEXsACHINE's user avatar
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Altocumulus lenticularis - Why is this not considered a "strati-form type cloud

Of the major cloud families, the "cumulus" type (including stratocumulus, altocumulus and so on) are generally formed by convection in unstable air, leading to their "lumpy" or &...
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Why are nocturnal winter clouds so bright or so easily illuminated at night, compared to clouds in the summer?

In the winter when it's overcast, clouds at night are much brighter or more easily illuminated (unsure if they appear above cities/towns only) than in summer, making them look orange at night. I don't ...
Giovanni's user avatar
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Atmospheric gravity waves or cumulus cloud street?

I observed these clouds today (november 12, Belgium) and I was wondering if they could be caused by atmospheric gravity waves. How would you spot the difference between gravity waves and a cloud ...
theWrongAlice's user avatar
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Can firecrackers be used to subside thunderstorms due to cumulonimbus clouds

Cumulonimbus clouds are associated with thunderstorms. Firecrackers which go up high in the sky and then burst into glittering show, can such crackers be injected in a cumulonimbus cloud and then ...
lousycoder's user avatar
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Visualization of formation of cirrus vertebratus?

I am trying to understand how Cirrus Vertebratus are formed. My book and many web pages simply say "waves orthogonally to the initial cloud formation direction, in fitting conditions, forming ...
323242323242's user avatar
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Determine cloud type on the picture

I'm struggling to determine a cloud type on the photo below (I assume it is a Cirrus cloud and wind shear also depicted there, correct me if I'm wrong).
pacman's user avatar
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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 ...
Math Student's user avatar
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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.
Deva's user avatar
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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 ...
Muze's user avatar
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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.
tec's user avatar
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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 ...
Brian White's user avatar
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How do I know where clouds form from a skew-T diagram?

I should know where clouds form in the atmosphere from the skew-T diagram below. The anwer should be that there is a big stromcloud from a height of 300hPa to 900hPa, but I don't get why. My reasoning ...
stancallewier's user avatar
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Question about calculating cloud raditiave feedback by adjusted cloud radiative forcing

from https://link.springer.com/article/10.1007/s00382-022-06369-z from https://link.springer.com/article/10.1007/s00382-022-06577-7 These two formulas aim to calculate cloud radiative feedback by ...
Wang1111's user avatar
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Showing cloud animations on a website

I want to show cloud movements from satellite imagery. How does sites like ZoomEarth.com make cloud animations? My understanding is: They download images from satellite image providers. Play those ...
user3656651's user avatar