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 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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What is this narrow band of clouds?

I came across a narrow streak of clouds in Asia when playing with Google Earth. Does anyone know what that is?
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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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What would a planet's sky look like with different chemical compositions, such as low nitrogen, high methane etc?

What are the processes, chemicals and particles involved in creating colour in a planet's sky? Could you give some examples of sky colour processes different from what happens on Earth?
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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 distinguish between Altocumulus, Stratocumulus and Cumulus clouds?

There are four different categories of clouds. High clouds, medium altitude clouds, lower clouds, and vertical tall clouds. They are broken down into ten genuses of clouds: Cirrus, Cirrocumulus, ...
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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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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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What kind of cloud is this?

I would like to know if anybody knows the name of this cloud formation. The picture was taken in Bern Switzerland, just before a cold front moved in. I am thinking about roll clouds or Asperatus ...
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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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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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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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Why are lenticular clouds circular?

I recently visited Japan, where I observed a lenticular cloud above Mount Fuji: Curious by the cloud, I looked it up and found it it's a lenticular cloud, that forms because of rising moist air ...
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GOES image: parallel trains of clouds. What to make of them?

Here is a GOES visible image from today, 2019-12-01 about local noon, around Nova Scotia. Note the parallel trains or streaks of clouds, running approximately northwest to southeast. A few hours ...
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How is a UV Index calculated?

I have three parameters for a particular location, namely: Ozone:- A numerical value representing the columnar density of total atmospheric ozone at the given time in Dobson units Elevation: The ...
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What type of cloud is this?

I live in a sub-tropical region of Australia. Earlier today, we experienced temperatures of 31C and it was clear about 2 hours before I went out and noticed the following clouds directly above my ...
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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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Fictional Land - How can I keep dense fog in an area for half a day? [closed]

This question is now here on Worldbuilding Stack Exchange I am a writer, and this question is for a fictional work. However, given its nature, I believe it is better suited here than Writers Stack ...
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Best sources / methods to find additional cloud information for current weather conditions?

I posted this question on Aviation Stack Exchange here. One of the responses suggested that I post my question on Earth Science Stack Exchange. I need a source that reports necessary current cloud ...
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How to estimate size of cloud formation

Looking up at say a cumulus cloud at a height of 2km which covers say 10 degrees of the visible sky, what is the easiest way to estimate its rough size at its base? Simply put, how large is the arc ...
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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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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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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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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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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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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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Clouds altitude

I'm amateur photographer and professional programmer and I'm trying to create an application to predict exceptionally beautiful sunsets (something like https://www.flickr.com/photos/photogtom43/...
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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 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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Why do clouds have areas of darkness instead of scattering light to produce a rainbow?

I suspect it has to do with the difference in size of a rain drop and that of the water particles in the cloud.
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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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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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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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Could this cloud be artificially formed?

This photo was taken at 3000 m above sea level in an open field, during the day.
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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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Does cloud fraction of 0 for low clouds means it was raining?

What information does cloud fraction provide about weather on a certain day? Do low-level (1000-700 hPa) cloud fraction, optical thickness of all clouds and total cloud fraction provide any ...
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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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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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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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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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How do simulate a cloudy day for a science fair project?

I'm trying to help my 5th grade daughter with her science fair project. She wants to test that water heats up more on a sunny day than a cloudy day. To help her, I'm trying to figure out how to ...
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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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Do cloud formations change depending on the season?

I'm currently working on some software for cloud masking, and thus far I have only been using satellite data as recent as spring (northern hemisphere). However, I'm wondering if cloud coverage or ...