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- Wind shear refers to the change in wind speed or direction with altitude. Strong wind shears can cause clouds to disperse or stretch out, leading to faster movement. Conversely, weak wind shears may result in slower cloud speeds.
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Jun 10, 2002 · The water and ice particles in the clouds we see are simply too small to feel the effects of gravity. As a result, clouds appear to float on air. Clouds are composed primarily of small water ...
- What Is A Cloud?
- Cloud Formation Conditions
- Formation of Water Drops in Clouds
- Formation of Small Ice Crystals in Clouds
- Cloud Evolution and Precipitation Formation
- Cloud Representation in Numerical Weather Prediction Models
- Messages to Remember
A cloud is composed of air, water vapour and liquid or solid water particles suspended in the atmosphere. It is these particles, called hydrometeors, whose characteristics (size, shape…) are very varied, that make it visible (read The Colours of the Sky) and are responsible for most of the remarkable luminous phenomena (read Spectacular Rainbows, A...
In this figure, if one is below the blue curve, the air is not saturated with water vapour, and the available liquid water (e.g. raindrops or the surface of a lake) will be subject to evaporation. On the contrary, if one is above the curve, the air is said to be supersaturated, and the water vapour will condense on the droplets present or the surfa...
In the free atmosphere, the vapour exchange does not take place with a flat surface but with droplets, which can be considered spherical as a first approximation. Two effects must be taken into account to determine the saturation vapour pressure near a droplet. For dry aerosols or aerosols that have captured very little water, the Raoult effect is ...
The mode of action of ice-forming cores is still a matter of debate: 1. the “stochastic” hypothesis highlights the random nature of the activation of active sites. The activation of icy cores would therefore depend on the duration of their exposure to favourable thermodynamic conditions. 2. the “singular” hypothesis, on the contrary, assigns to eac...
Once the cloud is formed, its evolution is directed by the set of interactions between hydrometeors and water vapour (Figure 11). The first of the processes involved is the exchange of water by condensation (deposition) and evaporation (sublimation) between vapour and droplets (crystals). Thus, if the air mass continues to rise and cool after cloud...
In numerical weather and climate prediction models (see Weather forecasting models and Climate Models), it is impossible to individually predict the evolution of each hydrometeor present. It is therefore necessary to represent more synthetically the characteristics of the hydrometeor population in each model grid box, which is the role ofmicrophysi...
Clouds are composed of hydrometeors, particles of condensed water in liquid form (cloud droplets and raindrops) and/or solids (small crystals, snow, hail…).The amount of water vapour that can be contained in the atmosphere is determined by the temperature and pressure of the air, and decreases with temperature. Clouds therefore form when warm, humid a...The cooling of the air can be of radiative origin, or caused by the lifting of the air which causes a decrease in pressure.The formation of clouds is generally driven by atmospheric circulation, the main cause of updrafts favourable to cloud formation, but the intense circulations set up in certain cloud systems (cyclo...As air rises it cools and decreases pressure, spreading out. Clouds form when the air cools below the dewpoint, and the air can not hold as much water vapor. NOAA. Clouds are made of water droplets or ice crystals that are so small and light they are able to stay up in the air.
Jun 4, 2023 · By Maruti Shah. June 4, 2023. How Fast Do the Clouds Move | Image Creadit: Shutter Stock , Photo Contributor: todking. Clouds are a fascinating phenomenon that captivates our attention as they drift across the sky. Have you ever wondered how fast these fluffy masses move?
Jul 24, 2023 · But it's not just this simultaneous falling and rising at play; while clouds appear at a relatively fixed height, they fluctuate as rising air mingles with droplets as they condense and...
- Elana Spivack
Apr 11, 2023 · When clouds of gas collide, several things happen at once. The gas and dust tangle up on each other and immediately trigger turbulent ripples that race throughout the newly merged clump.
Apr 26, 2024 · Stratus clouds are horizontal and stratified, or layered. Stratus clouds can blanket the entire sky in a single pattern. They usually occur close to Earth. Stratus clouds often form at the boundary of a warm front, where warm, moist air is forced up over cold air. This movement produces clouds as the moist air is cooled across the entire front.
