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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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Are these plane trails seen from satellite

Here are photos from West of Normandy, at 7-9am after sunrise on the 14th of may, from the visible satellite. It's a bit strange that they are visible from space, they are 2-3 miles wide? Are they jet ...
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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 ...
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Ordered arrangement of clouds

I happened to take a photograph of a region of clouds ,and it seems to have a rather ordered arrangement ,if one looks towards the left of the image. Would there be a physical explanation for this or ...
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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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What is this spaceship-shaped cloud?

This tweet from the European Space Agency (ESA)'s Spanish account show a striking photo of a round, flat, "space-ship-shaped" cloud in an otherwise completely clear sky. The stars are out so I assume ...
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Are there “transparent” clouds?

Comments below this answer to the question Why are lightning towers at launch pads topped with big hollow tubes with spiral windings and not “lightning rod-shaped” lightning rods? link to a 2013 ...
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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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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 is the smallest and largest cloud? [closed]

When is a cloud too small to be considered a cloud? What is the largest cloud officially on record?
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Is my understanding of saturation and cloud formation correct?

I'm trying to see if I understand the concepts of saturation, vapor pressure and cloud formation correctly. When, at a given temperature and height in the atmosphere, the rate of evaporation and ...
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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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Difference between sulfuric clouds and sulfuric haze (on Venus)?

In a conversation in comments below this answer to the question in Space Exploration Could we see the surface of Venus after the explosion of a H-bomb in its atmosphere? we're speculating about what ...
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Can someone help me identify this cloud formation?

These pictures were taken today in Oklahoma City and I am both baffled and curious as to what formation this may be. I was wondering if anyone had any idea? Thank you!
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Calculating a cloud cover index based on comparison of horizontal and tilted irradiance from pyranometers

I have data from 2 pyranometers, one in the horizontal plane and one in a tilted plane. The relevance of the tilting relates to their useage in solar-power plants whereby the tilt is in the same plane ...
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How to tell if fog is made out of water droplets or ice crystals?

I understand that clouds can be made out of water droplets and/or ice crystals. And that fog is nothing else than low-lying clouds. However, I've experienced fog in a wide ranges of temperatures. I ...
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Looking for global cloud cover animations or videos

I am looking for a video of global cloud cover. Something like an animated version of this image: (Originally presented at http://naturalearth.springercarto.com/ne3_data/8192/clouds/africa_clouds_8k....
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How to tell the difference between real rain and fake rain (cloud seeding)?

I live in a city where the pollution is bad, so bad that sometimes we get 'fake' rain (from cloud seeding). This may last for an extended period. There have been times before when it has “rained” and ...
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Electricity in clouds and induced magnetism

This is well known to everyone that clouds carry electric charges and cumulonimbus clouds contain huge amount of electricity. It is also known from Maxwell's equations that moving particles induce ...
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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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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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Why a stratus cloud does not always reach all the way to the ground?

The surface of the ground at night cools down because of outgoing long-wave radiation. In my understanding the cooling of the surface also causes cooling of the adjacent air. If the air contains ...
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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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What is the mixing ratio of a cloud?

A cloud has relative humidity of 100% or more. Is it correct to say that the mixing ratio of a cloud is undefined? My reasoning is that dry air in a cloud is negligible therefore $w = \frac{x g}{ 0 kg}...
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What is this ring of cloud?

We were in Legoland in Windsor (SE England) recently, and towards the end of the day, we noticed what looked like a ring of cloud in the sky. It was quite large (hard to say as being up in the sky we ...
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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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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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How to handle negative cosine of Solar Zenith Angle while calculating clear-sky UV Index?

I'm using this source to calculate the UVI value for every hour in a day (From 7am to 7pm). And using pysolar module to get the Solar Zenith Angle. The equation is ...
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What could the ball of cloud I saw be?

I wish I had a picture of this thing I saw, and I did try to video it, but then they hurtled very quickly out of sight. Anyway, I will try to explain. . . You know when you're up in a plane in the ...
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There are cloud identification guides, are there also (guided) rock identification websites?

Seeing all these rock identification questions, got me wondering, is there no straightforward guided rock identification website? In Intro to Geology lab, I remember going through a bit of a process ...
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How to interpret cloud coverage chart?

The following page describes the historical cloud amount at various locations along the path of totality of Solar Eclipse 2017. How do I interpret the cloud chart? When it says the cloud amount is ...
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Is there a name for these “pouring” clouds?

I snapped this photo with my phone flat against the window of a bus, facing south while traveling west across a bridge in New Taipei City. I'd say it was at about 24.995N, 121.438E. It was about 14:00 ...
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Are there measurements or calculations that suggest atmospheric ice plates would be horizontal to within 0.1 degrees?

This question describes a recently released explanation for flashes of light seen at the sub-solar point above Earth from the DSCOVR satellite, which is located in a special orbit between the Earth ...
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How do these cloud forms grow?

What conditions would cause these windswept clouds at sunset in Michigan? Do these cloud forms have a name?
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How to find Cloud cover data in GFS grib models

I've been looking for the cloud cover estimates provided in the NOAA GFS models. This page discusses all their weather products and one of the few I find that includes cloud cover data "Total Cloud ...
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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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Why does San Francisco see so much more fog than Seattle?

Having learned that fog often forms when wet air hits cold land, I’m now wondering why San Francisco sees so much more fog than Seattle does. They’re both Marine West Coast, with moist, westerly ...
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Which clouds can produce lighting and thunder?

There are several number of cloud types, but I only know that cumulonimbus clouds discharge electricity, which in turn produces thunder and lightning. Is this type of cloud (cumulonimbus) the only ...
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What might cause these “wave clouds” near the horizon? Could it be gravity waves?

I found this image on a website - returned as a HTTP error 404 'not found'. But the clouds look strangely repetitive. At first I thought the image had been "photoshopped", but as @gerrit pointed out ...
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“New” cloud types: Can they be used as markers for climate change observations?

This question was originally posted on Physics SE, (now deleted) but I think this community is a better fit. This article "New" type of Clouds, reports that a revision to the International Cloud ...
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What mechanism leads to these spectacular iridescent patterns in clouds labeled as a “Fire Rainbow”?

The 21-Feb-2016 BBC new article Singapore 'fire rainbow' cloud phenomenon lights up sky shows several photos of a rainbow-like iridescence in clouds on a sunny day in Singapore (about 1.3 degrees ...
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Are these clouds exhibiting gravity waves?

This is a GOES visible channel image from 2017-01-27, about 9 a.m. local time. It's the Atlantic coast of the US. The coast is visible towards the bottom of the image. The scale is large. This ...
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Why clouds are not moving in NASA's video of the Moon passing in front of the Earth?

I recently saw a short video from NASA. It shows the moon passing by the Earth as it rotates. NASA link: From a Million Miles Away, NASA Camera Shows Moon Crossing Face of Earth. The video itself ...
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Elevation of Atmosphere differ?

Does the atmosphere depth (or how high the air molecules from the ground) of Earth or Mars differ gradually or can there be plumes of atmosphere that reaches into space? If I were able to travel a ...
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Making clouds for science project

This is about a group project for our science class and we've decided to do a physical model on clouds. We could use liquid nitrogen and hot water to demonstrate the formation of the clouds and we ...
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Have these optical satellite ground station locations been chosen for clear skies?

Having lived in southern California, I know that some areas on the planet can be absurdly sunny and clear throughout the year, and having lived several other places, I know some areas can be ...
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What affects the surface characteristics of cumulus clouds?

I love looking at clouds. I love trying to describe them and compare what I see day to day. I have dozens of questions about the things I’ve observed and I would really like to understand the physics ...
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Beam of light coming from otherwise cloudly [closed]

I was viewing Google Street View and saw an oddly shaped line of light coming from the clouds. How did this happen? It probably couldn't be lightning as it appeared over multiple images and is too ...
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Calculate the Top of a Cloud

So, I'm trying to find the Height of the Top of a cloud from basic weather information (ie. temperature on the ground, altitude, pressure, humidity, dew point, etc.) I'm looking for an equation that ...
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Is there a seasonal difference in the average cloud floor?

It always looks like clouds are so much higher in the sky (altitude) in the summer than in the winter. Is that true? If not, is there some sort of optical illusion? If so, why is that? I live in Iowa,...