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.

Filter by
Sorted by
Tagged with
1
vote
1answer
16 views

Ice Water Content from GFS file

I am working my way through this paper: http://downloads.hindawi.com/journals/amete/2017/8707234.pdf Equations 10 and 11 require the ice water content. I can't find it in the GFS grib2 file ...
5
votes
1answer
462 views

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?
13
votes
2answers
4k views

Why are the clouds white and Australia black in weather satellite infrared images?

The question Is the sunlight on the GOES-16 Imagery reaching from the east? shows a visible light image and so in the night areas the Earth appears dark and in the day areas the Earth is a bit ...
-1
votes
1answer
195 views

Why is there a clear space between the ground and the cloud base?

On Earth there is a clear space between the ground and the cloud base. This phenomenon is not confined to Earth, it's the same on Venus, Mars and Titan (moon of Saturn). Is there a law of physics ...
0
votes
2answers
184 views

In which state of matter exactly are the clouds? [duplicate]

The state of the clouds and it can only be one of the three states, solid, liquid, or gas. Which one are clouds?
5
votes
2answers
504 views

Estimate cloudbase height

I am trying to estimate cloudbase height using calculations from my weather station temperature/humidity, by calculating those two variables I can get estimated cloudbase height but what puzzles me ...
2
votes
0answers
22 views

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 ...
0
votes
1answer
63 views

Cloud Formations Near Capetown

Why do clouds form a 'tablecloth' which exactly fits the top of Table Mountain near Capetown, South Africa? Something about the table top tailors the clouds to fit it exactly. The thickness is smooth ...
2
votes
1answer
52 views

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 ...
2
votes
0answers
60 views

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?
1
vote
0answers
59 views

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 ...
2
votes
2answers
105 views

Could this cloud be artificially formed?

This photo was taken at 3000 m above sea level in an open field, during the day.
3
votes
1answer
60 views

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/...
0
votes
0answers
26 views

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.
1
vote
1answer
125 views

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 ...
6
votes
1answer
141 views

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 ...
0
votes
0answers
86 views

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 ...
3
votes
1answer
80 views

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 ...
3
votes
0answers
60 views

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 ...
3
votes
0answers
68 views

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 ...
7
votes
2answers
1k views

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 ...
3
votes
1answer
184 views

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 ...
1
vote
0answers
14 views

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.
4
votes
0answers
125 views

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 ...
0
votes
1answer
116 views

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 ...
2
votes
0answers
59 views

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?
7
votes
1answer
245 views

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 ...
6
votes
1answer
110 views

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!
2
votes
1answer
69 views

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 ...
13
votes
2answers
360 views

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 ...
2
votes
1answer
223 views

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....
11
votes
1answer
2k views

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 ...
10
votes
1answer
415 views

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 ...
4
votes
1answer
160 views

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?
4
votes
0answers
48 views

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 ...
2
votes
1answer
76 views

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 ...
2
votes
0answers
15 views

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 ...
0
votes
1answer
866 views

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}...
3
votes
1answer
807 views

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 ...
3
votes
0answers
64 views

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 ...
1
vote
0answers
99 views

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 ...
4
votes
1answer
180 views

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 ...
3
votes
2answers
121 views

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 ...
5
votes
1answer
109 views

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 ...
3
votes
1answer
518 views

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 ...
6
votes
3answers
686 views

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 ...
3
votes
1answer
85 views

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 ...
5
votes
1answer
71 views

How do these cloud forms grow?

What conditions would cause these windswept clouds at sunset in Michigan? Do these cloud forms have a name?
5
votes
1answer
1k views

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 ...
3
votes
0answers
139 views

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 (...