What is the mechanism of cloud burst Why it occurs In what conditions cloud burst occurs?

Last summer 2006 clouds were burst resulting devastation in north India (Hryana) How it occurs in summer?What is the mechanism of cloud burst Why it occurs In what conditions cloud burst occurs?
A cloudburst is sudden copious rainfall. It is a sudden aggressive rainstorm falling for a short period of time limited to a small geographical area.



Meteorologists say the rain from a cloudburst is usually of the shower type with a fall rate equal to or greater than 100 mm (4.94 inches) per hour.



Generally cloudbursts are associated with thunderstorms. The air currents rushing upwards in a rainstorm hold up a large amount of water.



If these currents suddenly cease, the entire amount of water descends on to a small area with catastrophic force all of a sudden and causes mass destruction. This is due to a rapid condensation of the clouds.



They occur most often in desert and mountainous regions, and in interior regions of continental landmasses.



During a cloudburst, more than 2 cm of rain may fall in a few minutes. They are called 'bursts' probably because it was believed earlier that clouds were solid masses full of water. So, these violent storms were attributed to their bursting.



One of the major disasters from a cloudburst in India occurred in 2002 in Uttaranchal. Some 28 people died when villages like Marwari, Kotsisham, Matgoan and Agonda were hit by sudden cloudbursts.



Cloudbursts frequently occur in Himachal Pradesh during the monsoon
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What is the mechanism of cloud burst Why it occurs In what conditions cloud burst occurs?
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What is the mechanism of cloud burst Why it occurs In what conditions cloud burst occurs?
A cloudburst is an extreme form of rainfall, sometimes mixed with hail and thunder, which normally lasts no longer than a few minutes but is capable of creating minor flood conditionsCloudbursts descend from very high clouds, sometimes with tops above 15 kilometers. Meteorologists say the rain from a cloudburst is usually of the shower type with a fall rate equal to or greater than 100 mm (4.94 inches) per hour.



During a cloudburst, more than 2 cm of rain may fall in a few minutes. When there are instances of cloudbursts, the results can be disastrous.



Rapid precipitation from cumulonimbus clouds is possible due to so called Langmuir precipitation process in which large droplets can grow rapidly by coagulating with smaller droplets which fall down slowly.In the Indian subcontinent, a cloudburst usually occurs when a pregnant monsoon cloud drifts northwards, from the Bay of Bengal or Arabian Sea across the plains, then onto the Himalaya and bursts, bringing rainfall as high as 75 millimeters per hour[.



An example was the sudden cloud burst over the Indian city of Mumbai and other regions of western India, which occurred on the 26th of July, 2005. Approximately 950mm of rainfall was recorded in Mumbai over a span of eight to ten hours .



Cloudbursts frequently occur in Himachal Pradesh during the monsoon. The monsoon rains during July and August put a lot of water into the Himalayan soil.