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Weather modification is the act of intentionally manipulating or altering the weather. The most common form of weather modification is cloud seeding, which increases rainfall or snowfall, usually for the purpose of increasing the local water supply. Weather modification can also have the goal of preventing damaging weather, such as hail or hurricanes, from occurring; or of provoking damaging weather against an enemy, as a tactic of military or economic warfare like Operation Popeye, where clouds were seeded to prolong the monsoon in Vietnam. Weather modification in warfare has been banned by the United Nations under the Environmental Modification Convention.
Exmoor is loosely defined as an area of hilly open moorland in west Somerset and north Devon in South West England. It is named after the River Exe, the source of which is situated in the centre of the area, two miles north-west of Simonsbath. Exmoor is more precisely defined as the area of the former ancient royal hunting forest, also called Exmoor, which was officially surveyed 1815–1818 as 18,810 acres (7,610 ha) in extent. The moor has given its name to a National Park, which includes the Brendon Hills, the East Lyn Valley, the Vale of Porlock and 55 km (34 mi) of the Bristol Channel coast. The total area of the Exmoor National Park is 692.8 km2 (267.5 sq mi), of which 71% is in Somerset and 29% in Devon.
Cloud seeding is a type of weather modification that aims to change the amount or type of precipitation, mitigate hail or disperse fog. The usual objective is to increase rain or snow, either for its own sake or to prevent precipitation from occurring in days afterward.
Project Stormfury was an attempt to weaken tropical cyclones by flying aircraft into them and seeding with silver iodide. The project was run by the United States Government from 1962 to 1983. The hypothesis was that the silver iodide would cause supercooled water in the storm to freeze, disrupting the inner structure of the hurricane, and this led to seeding several Atlantic hurricanes. However, it was later shown that this hypothesis was incorrect. It was determined that most hurricanes do not contain enough supercooled water for cloud seeding to be effective. Additionally, researchers found that unseeded hurricanes often undergo the same structural changes that were expected from seeded hurricanes. This finding called Stormfury's successes into question, as the changes reported now had a natural explanation.
Lynmouth is a village in Devon, England, on the northern edge of Exmoor. The village straddles the confluence of the West Lyn and East Lyn rivers, in a gorge 700 feet (210 m) below Lynton, which was the only place to expand to once Lynmouth became as built-up as possible. The villages are connected by the Lynton and Lynmouth Cliff Railway, which works two cable-connected cars by gravity, using water tanks.
Charles Mallory Hatfield was an American "rainmaker".
Rainmaking, also known as artificial precipitation, artificial rainfall and pluviculture, is the act of attempting to artificially induce or increase precipitation, usually to stave off drought or the wider global warming. According to the clouds' different physical properties, this can be done using airplanes or rockets to sow to the clouds with catalysts such as dry ice, silver iodide and salt powder, to make clouds rain or increase precipitation, to remove or mitigate farmland drought, to increase reservoir irrigation water or water supply capacity, to increase water levels for hydropower generation, or even to solve the global warming problem.
The 2004 Boscastle flood occurred on Monday 16 August 2004 in the two villages of Boscastle and Crackington Haven in Cornwall, England, United Kingdom. The villages suffered extensive damage after flash floods caused by an exceptional amount of rain that fell over eight hours that afternoon. The flood in Boscastle was filmed and extensively reported, but the floods in Crackington Haven and Rocky Valley were not mentioned beyond the local news. The floods were the worst in local memory. A study commissioned by the Environment Agency from hydraulics consulting firm HR Wallingford concluded that it was among the most extreme ever experienced in Britain. The peak flow was about 140 m3/s, between 5:00 pm and 6:00 pm BST. The annual chance of this flood in any one year is about 1 in 400. The probability each year of the heaviest three-hour rainfall is about 1 in 1300. At midday on 16 August 2004, heavy thundery showers had developed across the South West due to a weak disturbance to the northeast of the United Kingdom.
Simonsbath is a small village high on Exmoor in the English county of Somerset. It is the principal settlement in the Exmoor civil parish, which is the largest and most sparsely populated civil parish on Exmoor, covering nearly 32 square miles (83 km2) but with a population, at the time of the 2001 census, of 203 in 78 households, reducing to 156 at the 2011 census. The River Exe rises from a valley to the north, and the River Barle runs through the village and is crossed by a triple-arched medieval bridge that was extensively repaired after floods in 1952.
The climate of south-west England is classed as oceanic (Cfb) according to the Köppen climate classification. The oceanic climate is typified by frequent cloudy skies, cool winters with cool summers and precipitation all year round, with more experienced in winter. Annual rainfall is about 1,000 millimetres (39 in) and up to 2,000 millimetres (79 in) on higher ground. Exceptions include areas to the east of high ground ( e.g. Exeter / parts of West Somerset that are subject to a rain shadow effect and annual rainfall is closer to 30 inches.
The Lynmouth Flood occurred on the night of 15–16 August 1952, principally affecting the village of Lynmouth, in North Devon. A storm with heavy rainfall, combined with already saturated soil and flood debris, led to the flooding of the village and a total loss of 34 lives.
The 2012 Great Britain and Ireland floods were a series of weather events that affected parts of Great Britain and Ireland periodically during the course of 2012 and on through the winter into 2013. The beginning of 2012 saw much of the United Kingdom experiencing droughts and a heat wave in March. A series of low pressure systems steered by the jet stream brought the wettest April in 100 years, and flooding across Britain and Ireland. Continuing through May and leading to the wettest beginning to June in 150 years, with flooding and extreme events occurring periodically throughout Britain and parts of Atlantic Europe.
The July 1968 United Kingdom thunderstorms were the most severe dust fall thunderstorms in the British Isles for over 200 years. A layer of mineral dust blowing north from the Sahara met cold, wet air over the British Isles, resulting in thick, dense clouds and severe thunderstorms across most of England and Wales. These clouds completely blotted out the light in some areas and the rain and hail resulted in property damage and flooding, and at least four people were killed. During the storm, Leeming Bar in North Yorkshire saw 35.7 millimetres (1.41 in) of rain in under 10 minutes – a UK record until 2003.
A black nor'easter is a persistent and potentially violent north-easterly storm that occurs on the east coast of Australia, particularly from southeastern Queensland to southern New South Wales, usually between late spring and early autumn, about two days a year.
Cloud seeding in the United Arab Emirates is a weather modification technique used by the government to address water challenges in the country. Cloud seeding is also referred to as man made precipitation and artificial rain making. The United Arab Emirates is one of the first countries in the Persian Gulf region to use cloud seeding technology. UAE scientists use cloud seeding technology to supplement the country's water insecurity, which stems from the extremely hot climate. They use weather radars to continuously monitor the atmosphere of the country. Forecasters and scientists have estimated that cloud seeding operations can enhance rainfall by as much as 30-35% percent in a clear atmosphere, and up to 10-15% in a more humid atmosphere. This practice has caused concerns regarding the impact on the environment because it is difficult to predict its long-term global implications.
Heavy flooding broke out in the Central Coast and Sydney areas of New South Wales, Australia, beginning in early July 2022. Around 85,000 people were displaced by the flooding or requested to leave their homes by authorities. The floods' damage was significant because rain fell on land that was already saturated after months of previous heavy rainfall. It was the third major flood in 2022 for some areas in the eastern seaboard.
Throughout 2022, between February and November, areas of the United Kingdom experienced significant flooding. The first wave of flooding occurred in February as Storm Franklin caused severe disruption across the country.
In April 2024, heavy rain severely impacted states in the Persian Gulf, causing flash flooding across the region. Several states recorded nearly a year's worth of rain in a single day. The floods had a significant impact across the region, with Oman and the United Arab Emirates being particularly affected, resulting in the deaths of at least 33 people, including 20 in Oman and 8 in Iran. Yemen, Bahrain, Qatar, and the Eastern Province of Saudi Arabia also experienced heavy rainfall and subsequent flooding.
References
- 1 2 Vidal, John and Helen Weinstein, RAF rainmakers 'caused 1952 flood', The Guardian, 30 August 2001, retrieved 21 July 2007.
- ↑ 1952: Flood devastates Devon village, BBC
- 1 2 Rain-making link to killer floods, BBC, 30 August 2001, retrieved 21 July 2007.
- ↑ , C. Kidson, January 1953
- ↑ , London Weekly Dispatch, February 14 1924
- ↑ Hilary Bradt; Janice Booth (11 May 2010). Slow Devon and Exmoor. Bradt Travel Guides. p. 249. ISBN 978-1-84162-322-1.
- ↑ Vidal, John; Weinstein, Helen (30 August 2001). "RAF rainmakers 'caused 1952 flood'". The Guardian. Guardian News and Media Limited. Retrieved 12 July 2018.
- ↑ Eden, Philip. ""The day they made it rain" Lynmouth Flood man-made?". WeatherOnline. Retrieved 22 January 2018.
Any meteorologist with a rudimentary knowledge of cloud seeding could explain why it is preposterous to blame the Lynmouth flood on such experiments.