As we know, meteorology uses different types of clouds to make weather predictions. Each type of cloud has its own characteristics and origin. One of the strangest cloud shapes is the mammatus cloud . These are a rather unusual type of cloud formation that never fails to impress. Both amateur and professional meteorologists pay attention to and photograph the strange shapes of mammatus clouds.
Therefore, we are going to dedicate this article to tell you about the origin, characteristics and prediction of mammatus clouds.
Key features
In this case, it's not the type of cloud itself, but its possible characteristics that are most important. Many people are captivated by the strange and picturesque formations of these clouds. Both amateur and professional meteorologists pay close attention to these mammoth-looking clouds that occasionally appear in the sky. One of the best-known examples of mammatus clouds is the meteorological image captured in Nebraska by NASA after a storm in 2004. This photo has become one of the most representative for identifying this type of cloud.
The current classification found in the cloud atlas , which includes 10 genera, 14 species, and 9 varieties, along with various additional features, includes mammatus clouds. This isn't a cloud type itself, but rather a way in which the base of many genera can be represented as a single type. The genera involved are: cumulonimbus, altocumulus, altostratus, cirrus, cirrocumulus, and stratocumulus. All of these can adopt this peculiar shape, which consists of hanging protuberances resembling large or small sacs suspended in the sky. Many people associate them with the mammary glands of mammals, hence their name.
How mammatus clouds form
Let's examine the formation of these cloud varieties based on atmospheric conditions. They often appear in the remnants of mature storms, meaning they are moving away from the observer during their most active phase. Most of the areas corresponding to these cloud formations can be observed within developing clouds. These clouds typically reach enormous vertical development with a characteristic anvil-shaped structure.
It is in the areas furthest from the active part of the cloud, which is the one with strong upward currents, that downward air currents tend to appear. It is one of the reasons why it gives rise to the formation of these striking breasts and characteristics of this cloud formation.
Throughout the sky, we see strange clouds with whimsical and, in many cases, even intimidating formations. Mammatus clouds feature countless bulges that form due to the collision of strong, descending vertical air currents. They are not clouds that can form independently and be classified separately, but rather they can develop from the clouds mentioned earlier. Whenever there is a descending air current that compresses the cloud against its natural upward movement, the resulting underside will have a kind of bulge or "mammatus" that gives this curious cloud formation its name.
One of the most impressive and striking formations occurs when a downdraft develops within a central cumulonimbus cloud. These clouds typically have an anvil shape and are responsible for the most spectacular mammatus clouds . From the base of the cloud, impressive plumes begin to hang, truly a sight to behold.
Environmental conditions of mammatus clouds
Let's examine the necessary environmental conditions for the formation of mammatus clouds. We'll start with the classic convective origin. All clouds form when warm air, being less dense than cold air, rises. This air rises like a water vapor bubble . Therefore, the warm air, laden with water vapor, eventually condenses when it encounters layers of cooler air, where the temperature decreases with altitude. This process forms microdroplets that, in turn, release heat energy into the surrounding environment due to the heat of condensation, which causes the cloud mass to rise even further.
The heat released during condensation is precisely the same amount of heat the sun had to apply to evaporate that same water droplet. This is known as the latent heat of vaporization. The exothermic phenomenon is quite significant and causes the updrafts to reach speeds of over 100 kilometers per hour , rising into the troposphere to altitudes of more than 15 kilometers. If there is a strong horizontal wind at an altitude of 5 to 10 kilometers, a cloud will form until it encounters a jet of cold air descending around the cloud formation, resulting in the characteristic anvil shape of a cumulonimbus cloud.
Mammatus are rare and spectacular. They sometimes occur after strong atmospheric phenomena have formed, such as at the bottom of cumulonimbus clouds. Although they are scary, they are harmless.
Details and omens
The upper part of the cloud can be quite large in proportion to the area where the air is rising. In areas far from the strong updrafts, the air is saturated with moisture and begins to descend along with the microcrystals carried by the air mass. This is where the "breasts" form. Each protuberance indicates one of these descents of air at the base of the cloud.
As for the omen, the presence of these clouds does not signal rain or other drastic changes in the weather. The phenomenon is quite attractive and spectacular especially at sunset when the reddened sun illuminates and contrasts all the curves of the bumps.
I hope that with this information you can learn more about mammatus clouds and their characteristics.