When do clouds form?

Answer 1

Actually,clouds form when water evaporates from rivers, ponds, oceans, and lakes. The air containing this evaporated water vapor rises and expands at higher altitudes here the air pressure is lower. The expanding air cools, and as this cooling occurs, the water vapor condenses (changes) from a vapor to a liquid. Many tiny water droplets form and a cloud is born. Conditions have to be just right for clouds to form. Nature needs tiny droplets of water, something for the droplets to cling to (particles like dust, salt, or smoke) and the right temperature. A variety of cloud types form depending upon their height, air movement, and the amount of water vapor and condensation particles. The basic cloud types include the following: * Stratus (spread out or layered). These clouds are low to the ground and layered. * Fog is very close to the ground. * Stratus clouds may predict rain. * Cirrus (curly, wispy). These clouds are the highest and are made of ice crystals. They may predict a change in weather like a coming storm. * Cumulus (heaped or piled up). Cumulus clouds are puffy with flat bottoms. * Cumulus clouds usually predict clear weather. There are many types of clouds in the sky. Did you know that some of them are man-made? "Contrails" are the long, thin clouds that are left by airplanes as they fly past. Contrails is short for "condensation trails." They are clouds that planes make. Contrails are man-made. They have a cousin that almost everyone has seen. Have you ever gone outside on a cold day? Have you seen a cloud come out of your mouth? That little cloud is made by water vapor that is usually invisible. In cold weather, the vapor condenses into a cloud you can see. Contrails are made the same way. A plane has an engine. The exhaust from the engine has water vapor. Temperatures are colder at higher altitudes. Water vapor condenses into ice crystals. This leaves the white lines you see behind planes. Sometimes, there is water in the air around the plane. This can make the contrail even bigger. If there is not a lot of water in the air, the contrails will not last long. When there is a lot of water in the air, the contrails will last longer. Ice from the plane will join water in the atmosphere. This will make a long contrail behind the airplane. It will stay in the sky long after the plane is gone. They can last for hours! They can even grow. They can get as big as football fields. They can spread until they turn into cirrus clouds. Contrails are made of water vapor. They do not hurt humans. NASA is trying to see if contrails may hurt the environment. Contrails are man-made clouds. They add to the Earth's cloud coverage. They might change temperatures and climates. We see a lot of contrails wherever there is heavy plane traffic. Air traffic keeps getting busier. Scientists are looking into what contrails might do. NASA might find that contrails hurt the environment. NASA wants to stop this from happening. One way would be to have planes fly away from problem areas. Another way is to make better engines. NASA is working with partners to make better jet engines. Someday, you might not even see contrails behind planes!

Answer 2

When warm moist air is forced to rise over a mountain, the warm air is also forced up in a convection current, and when two air masses of different temperatures collide, clouds form.

Science -> Earth Sciences -> Atmospheric Sciences

Answer 3

Clouds form when water evaporates by the sun it then cools, condenses and forms a cloud and thats what makes those pretty white fluffy things in the sky.

Answer 4

The reason why clouds form different is because the water that gets into them split up and go into differ clouds and them stay until it rains

Answer 5

When water evaporates into the air and forms a cloud... known as precipatation

Clouds form when moist air rises and is cooled

Answer 6

When the water vapor condenses as it gets cold it comes together and forms a cloud.

Answer 7

In the Troposphere

Answer 8

Rain clouds are _____ form.