Nimbostratus clouds are dark, grey, featureless layers of cloud, thick enough to block out the Sun. Producing persistent rain, these clouds are often associated with frontal systems provided by mid-latitude cyclones. These are probably the least picturesque of all the main cloud types.
What is special about nimbostratus clouds?
Nimbostratus are dark, low-level clouds accompanied by light to moderately falling precipitation. Low clouds are primarily composed of water droplets since their bases generally lie below 6,500 feet (2,000 meters). However, when temperatures are cold enough, these clouds may also contain ice particles and snow.
What is the difference between Stratus and nimbostratus?
Both nimbostratus and stratus clouds can be found at the same height, are both relatively featureless, and are both the same light gray to dark gray color. The biggest differentiator is that nimbostratus clouds contain rain, whereas stratus clouds only contain rain on the rarest of occasions.
What is the difference between cumulonimbus clouds and nimbostratus clouds?
Nimbostratus clouds form a thick, dark layer across the sky. They are often thick enough to blot out the sun. Like cumulonimbus clouds, they are associated with heavy precipitation, but, unlike cumulonimbus, you can’t pick out individual nimbostratus clouds.
What causes nimbostratus?
Nimbostratus clouds are formed when warm, moist air is gradually lifted over a large area, typically produced by a warm front. … With warm fronts, the cloud layer is much more stable, resulting in the formation of nimbostratus clouds.
Where do you find nimbostratus clouds?
Nimbostratus has a diffuse cloud base generally found anywhere from near surface in the low levels to about 3,000 m (9,800 ft) in the middle level of the troposphere. Although usually dark at its base, it often appears illuminated from within to a surface observer.
What do cumulonimbus clouds indicate?
Cumulonimbus clouds are associated with extreme weather such as heavy torrential downpours, hail storms, lightning and even tornadoes. Individual cumulonimbus cells will usually dissipate within an hour once showers start falling, making for short-lived, heavy rain.
What does a cumulonimbus cloud look like?
Cumulonimbus clouds are large, tall clouds that are dark on the bottom, bring thunderstorms, have a fuzzy outline toward the upper part of the cloud and may have a flat top called an anvil. Besides thunderstorms, these clouds can bring hail, tornadoes and snow, and they also form during hurricanes.
Are nimbostratus clouds stable or unstable?
When stratiform clouds precipitate (nimbostratus), rain, snow, sleet, or freezing rain tends to be steady, relatively long-lived (a few to several hours), and spread out over a fairly large region.
What does Nimbostratus look like?
Nimbostratus clouds are dark gray and thick enough to hide the sun completely. Unlike some other clouds, they don’t come in different shapes. You can’t look up at a nimbostratus cloud and guess what the shape of the cloud looks like – it just looks flat and gray, like a big cloud blanket over the whole sky.
What is Nimbostratus cloud altitude?
The main body of Nimbostratus almost invariably occurs at altitudes between 2 km and 4 km (6 500 ft and 13 000 ft) in polar regions, between 2 km and 7 km (6 500 ft and 23 000 ft) in temperate regions and between 2 km and 8 km (6 500 ft and 25 000 ft) in tropical regions.
What is the altitude of high clouds?
High clouds form in the highest and coldest region of the troposphere from about 5 to 12 km (16,500 to 40,000 ft) in temperate latitudes. At this altitude water almost always freezes so high clouds are generally composed of ice crystals or supercooled water droplets.
What is something that nimbostratus and cumulonimbus have in common?
The words nimbostratus and cumulonimbus both have “nimbus” as part of the word. The nimbus portion of the word means “rain producing”. Thus, these clouds are rain producing clouds. The term “cumulo” indicates a vertically developed cloud.
How high up are cumulonimbus clouds?
39,000 feet Fueled by vigorous convective updrafts (sometimes in excess 50 knots), the tops of cumulonimbus clouds can easily reach 39,000 feet (12,000 meters) or higher.
What does an occluded front look like?
On a weather map, shown to the left, an occluded front looks like a purple line with alternating triangles and semicircles pointing in the direction that the front is moving. It ends at a low pressure area shown with a large ‘L’ on the map, begins at the other end when cold and warm fronts connect.
Do cumulonimbus clouds produce snow?
Cumulonimbus can form alone, in clusters, or along cold front squall lines. These clouds are capable of producing lightning and other dangerous severe weather, such as tornadoes and hailstones. …
Very common Rain, Snow, Snow pellets or Hail, heavy at times
How do you pronounce nimbostratus?
What is the rarest cloud?
Kelvin Helmholtz Waves are perhaps the rarest cloud formation of all. Rumored to be the inspiration for Van Gogh’s masterpiece “Starry Night”, they are incredibly distinctive. They are mainly associated with cirrus, altocumulus, and stratus clouds over 5,000m.
How long do cumulonimbus clouds last?
If a cumulonimbus cloud develops into a supercell, it can last several hours or longer. This type of storm often results in lightning, hail, strong and damaging wind, and tornadoes. Often the rain produced by a cumulonimbus cloud only lasts for 20 minutes or less, but the rainfall itself is often very heavy.
Where is a cumulonimbus cloud?
troposphere Cumulonimbus clouds form in the lower part of the troposphere, the layer of the atmosphere closest to the surface of the Earth.Oct 1, 2009
Are all thunderstorms cumulonimbus?
Thunderstorms occur in a type of cloud known as a cumulonimbus. They are usually accompanied by strong winds and often produce heavy rain and sometimes snow, sleet, or hail, but some thunderstorms produce little precipitation or no precipitation at all.
How do cirrostratus clouds form?
Cirrostratus are sheet-like, high-level clouds composed of ice crystals. … These high-level clouds typically form when a broad layer of air is lifted by large-scale convergence. Photograph by: Rauber. Sometimes the only indication of their presence is given by an observed halo around the sun or moon.
What are the features of cumulonimbus cloud over Africa?
The clouds can form alone, in clusters, or along a cold front in a squall line. The high energy of these storms is associated with heavy precipitation, lightning, high wind speeds and tornadoes.
What causes orographic lifting?
Same as Orographic Lifting; occurs when air is forced to rise and cool due to terrain features such as hills or mountains. If the cooling is sufficient, water vapor condenses into clouds. Additional cooling results in rain or snow.
How do you say cumulonimbus cloud?
Can nimbostratus produce hail?
Cumulonimbus clouds and nimbostratus clouds can also can produce snow, hail, sleet, and other forms of precipitation.
How do you draw a nimbostratus cloud?
Is there a nimbus cloud?
Nimbus clouds are clouds that produce precipitation that reach the ground in the form of rain, snow or hail. There are two types of clouds, namely, cumulonimbus (cumulus clouds) and nimbostratus (stratus clouds).
Why are nimbus clouds dark?
But why are rain clouds so dark? … That is, a cloud gets thicker and denser as it gathers more water droplets and ice crystals — the thicker it gets, the more light it scatters, resulting in less light penetrating all the way through it.
What is the biggest cloud in the sky?
Noctilucent clouds, or night shining clouds, are tenuous cloud-like phenomena in the upper atmosphere of Earth. …
They are the highest clouds in Earth’s atmosphere, located in the mesosphere at altitudes of around 76 to 85 km (249,000 to 279,000 ft).
What are the three types of cloud?
Cumulus, Stratus, and Cirrus. There are three main cloud types.