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Source: The post is based on the article “Massive shelf cloud appears in Haridwar amid heavy rains” published in Livemint on 11th July 2023
What is the News?
A terrifying shelf cloud has recently appeared in Uttarakhand’s Haridwar amid heavy rains.
What are Shelf Clouds?
Source: Moneycontrol
Shelf clouds are a type of arcus cloud, characterized by their impressive and intimidating appearance.
These unique cloud formations often resemble a large, horizontal wedge or shelf extending from the base of a thunderstorm or cumulonimbus cloud.
These clouds are typically formed on the leading edge of a storm.
Formations of Shelf Clouds:
The formation of shelf clouds occurs when a mass of cold and dense air is forcefully driven by the wind into a warmer air mass.
This phenomenon takes place during the downdraft of a thunderstorm, where the cold air rapidly descends and disperses, creating a strong gust front.
Distinctive Features of Shelf Cloud:
Shelf clouds exhibit several distinct features that contribute to their dramatic appearance.The underside of the shelf cloud is often dark and menacing, featuring turbulent and rapidly rising air.
This area is characterized by a swirling mass of clouds, indicating the intense updrafts and strong winds associated with the thunderstorm.
The leading edge of the cloud is typically smooth and well-defined, appearing as a rolling arc or shelf. This edge may have a greenish or bluish tint due to the scattering of sunlight caused by water droplets within the cloud.
Significance and implications of Shelf Clouds:
As shelf clouds are usually associated with thunderstorms, their presence serves as a visual warning sign of impending severe weather. However, they are typically harmless.
