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A cloudburst is an extreme amount of precipitation in a short period of time, mm of precipitation corresponds to 25,000 metric tons/km2 (1 inch corresponds to 72,300 short tons over one square mile). However, cloudbursts are infrequent as they occur only via orographic lift or occasionally when a warm air parcel mixes with cooler air, resulting in sudden condensation. At times, a large amount of runoff from higher elevations is mistakenly conflated with a cloudburst. The term "cloudburst" arose from the notion that clouds were akin to water balloons and could burst, resulting in rapid precipitation. Though this idea has since been disproven, the term remains in use.sometimes accompanied by hail and thunder, which is capable of creating flood conditions. A cloudburst can suddenly dump large amounts of water e.g. 25
In meteorology, precipitation is any product of the condensation of atmospheric water vapor that falls under gravity. The main forms of precipitation include drizzle, rain, sleet, snow, graupel and hail. Precipitation occurs when a portion of the atmosphere becomes saturated with water vapor, so that the water condenses and "precipitates". Thus, fog and mist are not precipitation but suspensions, because the water vapor does not condense sufficiently to precipitate. Two processes, possibly acting together, can lead to air becoming saturated: cooling the air or adding water vapor to the air. Precipitation forms as smaller droplets coalesce via collision with other rain drops or ice crystals within a cloud. Short, intense periods of rain in scattered locations are called "showers."
Hail is a form of solid precipitation. It is distinct from ice pellets, though the two are often confused. It consists of balls or irregular lumps of ice, each of which is called a hailstone. Ice pellets fall generally in cold weather while hail growth is greatly inhibited during cold surface temperatures.
Orographic lift occurs when an air mass is forced from a low elevation to a higher elevation as it moves over rising terrain. As the air mass gains altitude it quickly cools down adiabatically, which can raise the relative humidity to 100% and create clouds and, under the right conditions, precipitation.
Rainfall rate equal to or greater than 100 millimetres (3.9 in) per hour is a cloudburst. However, different definitions are used, e.g. the Swedish weather service SMHI defines the corresponding Swedish term "skyfall" as 1 mm/min for short bursts and 50 mm/h for longer rainfalls. The associated convective cloud can extend up to a height of 15 kilometres (9.3 mi) above the ground.
In meteorology, a cloud is an aerosol consisting of a visible mass of minute liquid droplets, frozen crystals, or other particles suspended in the atmosphere of a planetary body or similar space. Water or various other chemicals may compose the droplets and crystals. On Earth, clouds are formed as a result of saturation of the air when it is cooled to its dew point, or when it gains sufficient moisture from an adjacent source to raise the dew point to the ambient temperature. They are seen in the Earth's homosphere. Nephology is the science of clouds, which is undertaken in the cloud physics branch of meteorology.
During a cloudburst, more than 20 millimetres (0.79 in) of rain may fall in a few minutes. The results of cloudbursts can be disastrous. Cloudbursts are also responsible for flash flood creation.
A flash flood is a rapid flooding of low-lying areas: washes, rivers, dry lakes and basins. It may be caused by heavy rain associated with a severe thunderstorm, hurricane, tropical storm, or meltwater from ice or snow flowing over ice sheets or snowfields. Flash floods may occur after the collapse of a natural ice or debris dam, or a human structure such as a man-made dam, as occurred before the Johnstown Flood of 1889. Flash floods are distinguished from regular floods by having a timescale of fewer than six hours between rainfall and the onset of flooding. The water that is temporarily available is often used by plants with rapid germination and short growth cycles and by specially adapted animal life.
Rapid precipitation from cumulonimbus clouds is possible due to the Langmuir precipitation process in which large droplets can grow rapidly by coagulating with smaller droplets which fall down slowly. It is not essential that cloudbursts occur only when a cloud clashes with a solid body like a mountain. They can also occur when hot water vapor mingles into the cold resulting in sudden condensation.
In physical oceanography, Langmuir circulation consists of a series of shallow, slow, counter-rotating vortices at the ocean's surface aligned with the wind. These circulations are developed when wind blows steadily over the sea surface. Irving Langmuir discovered this phenomenon after observing windrows of seaweed in the Sargasso Sea in 1927. Langmuir circulations circulate within the mixed layer; however, it is not yet so clear how strongly they can cause mixing at the base of the mixed layer.
|1 minute||1.5 inches (38.10 mm)||Basse-Terre, Guadeloupe||26 November 1970|
|5.5 minutes||2.43 inches (61.72 mm)||Port Bell, Panama||29 November 1911|
|15 minutes||7.8 inches (198.12 mm)||Plumb Point, Jamaica||12 May 1916|
|20 minutes||8.1 inches (205.74 mm)||Curtea de Argeș, Romania||7 July 1947|
|40 minutes||9.25 inches (234.95 mm)||Guinea, Virginia, United States||24 August 1906|
|1 hour||9.84 inches (250 mm)||Leh, Jammu and Kashmir, India||August 5, 2010|
|1 hour||5.67 inches (144 mm)||Pune, Maharashtra, India||September 29, 2010|
|1.5 hours||7.15 inches (182 mm)||Pune, Maharashtra, India||October 4, 2010|
|5 hours||15.35 inches (390 mm)||La Plata, Buenos Aires, Argentina||April 2, 2013|
|10 hours||57.00 inches (1,448 mm)||Mumbai, Maharashtra, India||July 26, 2005|
|24 hours||54.00 inches (1,372 mm)||Pithoragarh, Uttarakhand, India||July 1, 2016|
|13 hours||45.03 inches (1,144 mm)||Foc-Foc, La Réunion||January 8, 1966|
|20 hours||91.69 inches (2,329 mm)||Ganges Delta, Bangladesh/India||January 8, 1966|
|24 hours||73.62 inches (1,870 mm)||Cilaos, La Réunion||March, 1952|
In the Indian subcontinent, a cloudburst usually occurs when a monsoon cloud drifts northwards, from the Bay of Bengal or Arabian Sea across the plains, then onto the Himalayas and bursts, bringing rainfall as high as 75 millimetres per hour.
Monsoon is traditionally defined as a seasonal reversing wind accompanied by corresponding changes in precipitation, but is now used to describe seasonal changes in atmospheric circulation and precipitation associated with the asymmetric heating of land and sea. Usually, the term monsoon is used to refer to the rainy phase of a seasonally changing pattern, although technically there is also a dry phase. The term is sometimes incorrectly used for locally heavy but short-term rains, although these rains meet the dictionary definition of monsoon.
The Bay of Bengal is the northeastern part of the Indian Ocean, bounded on the west and northwest by India on the north by Bangladesh, and on the east by Myanmar and the Andaman Islands of India and Myanmar and the Nicobar Islands of India. Its southern limit is a line between Sri Lanka and the northwesternmost point of Sumatra (Indonesia). It is the largest water region called a bay in the world. There are Countries dependent on the Bay of Bengal in South Asia and Southeast Asia. The Bay of Bengal was also called the Chola Lake.
The Arabian Sea is a region of the northern Indian Ocean bounded on the north by Pakistan and Iran, on the west by the Gulf of Aden, Guardafui Channel and the Arabian Peninsula, on the southeast by the Laccadive Sea, on the southwest by the Somali Sea, and on the east by India. Its total area is 3,862,000 km2 (1,491,000 sq mi) and its maximum depth is 4,652 metres (15,262 ft). The Gulf of Aden in the west connects the Arabian Sea to the Red Sea through the strait of Bab-el-Mandeb, and the Gulf of Oman is in the northwest, connecting it to the Persian Gulf.
Dhaka, formerly known as Dacca, is the capital and largest city of Bangladesh. It is one of the largest and most densely populated cities in the world, with a population of 18.89 million people in the Greater Dhaka Area. Dhaka is the economic, political and cultural center of Bangladesh. It is one of the major and one of the biggest cities of South Asia, the largest city in Eastern South Asia and among the Bay of Bengal countries; and one of the largest cities among OIC countries. As part of the Bengal plain, the city is bounded by the Buriganga River, Turag River, Dhaleshwari River and Shitalakshya River. The city is located in an eponymous district and division.
Chittagong, officially known as Chattogram, is a major coastal city and financial centre in southeastern Bangladesh. The city has a population of more than 2.5 million while the metropolitan area had a population of 4,009,423 in 2011, making it the second-largest city in the country. It is the capital of an eponymous District and Division. The city is located on the banks of the Karnaphuli River between the Chittagong Hill Tracts and the Bay of Bengal.
The uplands adjacent to the Front Range of Colorado and the streams which drain the Front Range are subject to occasional cloudbursts and flash floods. This weather pattern is associated with upslope winds bringing moisture northwestward from the Gulf of Mexico.
Karachi has an arid climate, albeit a moderate version of this climate. Karachi is located on the coast and as a result has a relatively mild climate. Karachi has two main seasons; Summer & Winter, while spring and autumn are very short. Summer season persists for longest period during the year.Karachi also receives the monsoon rains from July to September. The city enjoys a tropical climate encompassing warm winters and hot summers. The humidity levels usually remain high from March to November, while very low in Winter as the wind direction in winter is North Easterly.
Pakistan recorded one of the highest temperatures in the world – 53.5 °C (128.3 °F) – on 26 May 2010, the hottest temperature ever recorded in Pakistan, but also the hottest reliably measured temperature ever recorded on the continent of Asia. As Pakistan is located on a great landmass north of the Tropic of Cancer, it has a continental type of climate characterized by extreme variations of temperature, both seasonally and daily. Very high altitudes modify the climate in the cold, snow-covered northern mountains; temperatures on the Balochistan Plateau are somewhat higher. Along the coastal strip, the climate is modified by sea breezes. In the rest of the country, temperatures reach great heights in the summer; the mean temperature during June is 38 °C (100 °F) in the plains, the highest temperatures can exceed 47 °C (117 °F). In the summer, hot winds called Loo blow across the plains during the day. Trees shed their leaves to avoid loss of moisture. The dry, hot weather is broken occasionally by dust storms and thunderstorms that temporarily lower the temperature. Evenings are cool; the diurnal variation in temperature may be as much as 11C to 17C. Winters are cold, with minimum mean temperatures in Punjab of about 4 °C (39 °F) in January, and sub-zero temperatures in the far north and Balochistan.
The climate of Islamabad is a humid subtropical climate (Köppen climate classification, with five seasons: Winter, Spring, Summer, Rainy Monsoon and Autumn. The hottest month is June, where average highs routinely exceed 38 °C. The wettest month is July, with heavy rainfall and evening thunderstorms with the possibility of cloudburst. The coolest month is January, with temperatures variable by location. In Islamabad, temperatures vary from cold to mild, routinely dropping below zero. In the hills there is sparse snowfall. The weather ranges from a minimum of −3.9 °C in January to a maximum of 46.1 °C in June. The average low is 2 °C in January, while the average high is 38.1 °C in June. The highest temperature recorded was 46.5 °C in June, while the lowest temperature was −4 °C in January. On 23 July 2001, Islamabad received a record breaking 620 millimetres of rain fell in just 10 hours. It was the heaviest rainfall in 24 hours in Islamabad and at any locality in Pakistan during the past 100 years. Following is the weather observed over Islamabad Airport, which is actually located in Rawalpindi.
The 2010 Ladakh floods occurred on 6 August 2010 across a large part of Ladakh, a region in the northernmost Indian state of Jammu and Kashmir. 71 towns and villages were damaged, including the main town in the area, Leh. At least 255 people are reported to have died, six of whom were foreign tourists, after a cloudburst and heavy overnight rains triggered flash floods, mudflows, and debris flows. 200 people were reported missing in the initial aftermath of the storm, and thousands more were rendered homeless after the flooding caused extensive damage to property and infrastructure. Overall, 9000 people were directly affected by the event.
Lahore features a five-season semi-arid climate (from another source: Composite monsoon climate) with five seasons: foggy winter with few western disturbances causing rain; pleasant spring ; summer with dust, rain storms and heat wave periods; rainy monsoon ; and dry autumn.
Quetta, Pakistan features a continental and semi-arid climate with significant variations between summer and winter. The highest temperature recorded in Quetta was 42 °C (108 °F) on 10 July 1998. The lowest temperature in Quetta is −18.3 °C (−0.9 °F) which was recorded on 8 January 1970.
Multan is located in the southern part of Punjab, province in Pakistan.Multan features an arid climate with very hot summers and cold winters. The city witnesses some of the most extreme temperatures in the country.Dust storms are a common occurrence within the city. The closest major city is Bahawalpur. The area around the city is a flat plain and is ideal for agriculture, with many citrus and mango farms. There are many canals that cut across the Multan District, providing water from nearby farms. This makes the land very fertile. However usually land close to the Chenab River are flooded in the monsoon season.
The climate of Hyderabad features an arid climate. The days are hot and dry, usually going up to extreme highs of 40 °C (104 °F), while the nights are cool and breezy. Winds usually bring along clouds of dust, and people prefer staying indoors in the daytime, while the breezes at night are pleasant and clean.
Dhaka experiences a hot, wet and humid tropical climate. Under the Köppen climate classification, Dhaka has a tropical wet and dry climate. The city has a distinct monsoonal season, with an annual average temperature of 25 °C (77 °F) and monthly means varying between 18 °C (64 °F) in January and 29 °C (84 °F) in August. Nearly 80% of the annual average rainfall of 1,854 millimetres (73.0 in) occurs during the monsoon season which lasts from May until the end of September. Increasing air and water pollution emanating from traffic congestion and industrial waste are serious problems affecting public health and the quality of life in the city. Water bodies and wetlands around Dhaka are facing destruction as these are being filled up to construct multi-storied buildings and other real estate developments. Coupled with pollution, such erosion of natural habitats threatens to destroy much of the regional biodiversity.
The 2011 Balochistan floods started from the last week of February and continued till the first week of March. Balochistan province was already badly affected from last year's devastating floods as UNHCR claims that 166,000 flood victims are still homeless in the province with 240 people still living in camps.
On 23 July 2001, Islamabad experienced a record breaking 620 millimetres (24 in) of rainfall, which was the 24 hours heaviest rainfall in Pakistan during the past 100 years. Continuous downpour lasted for about 10 hours from 0600 to 1600 PST in Islamabad and Rawalpindi, caused the worst ever Flash flood in the local stream called Nulla Lai and its tributaries of Rawalpindi, which not only flood the low-lying areas of the twin cities but swept away the banks of the stream and buildings built in the encroachments. Islamabad's twin city, Rawalpindi experienced 335 millimetres (13.2 in) of rain during this event.
The 2011 China floods are a series of floods from June to September 2011 that occurred in central and southern parts of the People's Republic of China. They were caused by heavy rain that inundated portions of 12 provinces, leaving other provinces still suffering a prolonged drought, a total of over 36 million people have been affected, killing at least 355 and with direct economic losses of nearly US$6.5 billion.
The flood was originated mostly because of rainfall and observed the highest ever recorded monsoon rain in Sindh started from Aug 11, 2011 to Sept 14, 2011. So the inundated area increased respectively with rainfall and ceased on Sept 15, 2011 effectively with the stop of rainfall. After Sept 15, 2011 the inundated area was reduced with the rate of 167 km2/day. The floods caused considerable damage; an estimated 434 civilians were killed, with 5.3 million people and 1,524,773 homes affected. Sindh is a fertile region and often called the "breadbasket" of the country; the damage and toll of the floods on the local agrarian economy was extensive. At least 1.7 million acres of arable land was inundated as a result of the flooding. The flooding followed the previous year's historic 2010 Pakistan floods, which devastated the entire country. Unprecedented torrential monsoon rains caused severe flooding in 16 districts of Sindh province.
Rawalpindi features a humid subtropical climate with long and hot summers, a monsoon and short, mild and wet winters. Its climate is classified as very similar to its twin city Islamabad, but the geographical location and extreme urbanization of Rawalpindi has led to weather and climatic conditions that are notably different from its twin. Rawalpindi's weather has historically been known to change rather quickly due to its proximity to Himalayas and the Pir Panjal Range. These mountains not only influence the weather of the city, but also provide great recreation during the hot months. Furthermore, Its warm comfortable mean annual temperature of 21.3 °C (70 °F) attracts people to live here permanently from all over Pakistan. The average annual rainfall is abundant at 1,246.8 millimetres (49.09 in), most of which falls in the monsoon season. However, frontal cloud bands also bring significant rainfall in the winter. In summers, June is the hottest with record maximum temperature at a blistering 48.3 °C (119 °F) recorded on 13 June 1953. On the other hand, January is the coldest month of the year when temperature can drop to a minimum −3.9 °C (25 °F) in the winter recorded on 17 January 1967. Throughout the year, Rawalpindi and Islamabad experience an average of about 90 thunderstorms, which is the highest frequency of thunderstorms in Punjab province of any plane station. In fact, most rainfall in the city is accompanied by a thunderstorm with peak activity experienced in August. Record rainfall was experienced in the year 2013 at a massive 1,988 millimetres (78.3 in) mostly due to an unusually wet monsoon season. On a typical day, the city hosts breezy afternoons, but usually calm to light breeze wind conditions are observed after midnight. The mean annual wind speed of Rawalpindi is roughly 10 kilometres per hour (6.2 mph) at 14 m height. Moreover, just a few kilometers southwest of Rawalpindi, the potential power generation has been identified by U.S. Aid to be between marginal to good at 50 m height.
The 2014 South Korea floods were a series of floods in late August 2014 caused by heavy rainfall around the Honam and Yeongnam. This flood season killed about 10 people, and caused many accidents during 18 August to 25 August. In some places, The rain fell over 50 mm in an hour.
Flooding occurs when an extreme volume of water is carried by rivers, creeks and many other geographical features into areas where the water cannot be drained adequately. Often during times of heavy rainfall, drainage systems in residential areas are not adequate, or unchecked civil development severely impedes the functionality of an otherwise acceptable drainage system. Floods cause extremely large numbers of fatalities in every country, but due to India's extremely high population density and often under-enforced development standards, a large amount of damages and many deaths which could be otherwise avoided, are allowed to happen. India witnesses flood due to excessive rain which then results in overflow of rivers, lakes and dams, which adds to cause large amounts of damage to people's lives and property. In the past, India has witnessed many of the largest, most catastrophic floods, causing irreparable damage to people's livelihood, property, and crucial infrastructure.
Intense flooding and mudslides struck São Paulo (city) and São Paulo (state), Brazil, following heavy rain and killed at least 21. The downpour in São Paulo and the surrounding areas set new records for rainfall levels for the month of March and left cities covered in up to a meter of slowly draining mud and flood water. The rain occurred after months of drought.
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