Thunderstorm
A typical thunderstorm lifts approximately 500 million kilograms of water vapor into the Earth's atmosphere. This massive amount of moisture begins its journey as warm, moist air rises rapidly upward from the ground. The process starts when solar illumination heats the surface or when two winds converge to force air upwards. As this air ascends, it cools and condenses into liquid drops that appear as cumulus clouds. The condensation releases latent heat which warms the surrounding air and allows it to rise even higher than the cooler air around it. This cycle continues until the rising packet reaches an area of warmer air known as the tropopause. At that point the air can no longer ascend and spreads out horizontally to form a characteristic anvil shape.
Every thunderstorm regardless of type goes through three distinct stages: developing mature and dissipation. Each stage takes an average of 30 minutes to complete within a single cell storm. During the developing stage masses of moisture lift upwards while creating a low-pressure zone beneath the forming cloud. The mature stage arrives when warmed air continues to rise until it hits the tropopause and spreads outward. Falling rain drags surrounding air with it to create downdrafts alongside existing updrafts. Simultaneous presence of both updrafts and downdrafts marks the mature phase where strong winds severe lightning and tornadoes may occur. The dissipation stage follows quickly if atmospheric conditions do not support supercellular development occurring approximately 20 to 30 minutes into the life of the storm. A downburst pushes cold air to the ground cutting off inflow and killing further growth.
Single-cell thunderstorms also called air-mass storms last only 20 to 30 minutes and form in environments of low vertical wind shear. These are typical summer thunderstorms found in many temperate locales or cool unstable air following passage of a cold front from the sea during winter. Multi-cell clusters represent the most common type of thunderstorm development where mature storms sit near the center while dissipating ones exist on their downwind side. Squall lines are elongated lines of severe thunderstorms that can form along or ahead of a cold front containing heavy precipitation hail frequent lightning and strong straight-line winds. Supercell storms are large quasi-steady-state storms forming in environments where wind speed or direction varies with height. They have separate downdrafts and updrafts with a strong rotating updraft known as a mesocyclone. Research shows at least 90 percent of supercells cause severe weather including destructive tornadoes extremely large hailstones and flash floods.
Cloud-to-ground lightning frequently occurs within phenomena of thunderstorms posing numerous hazards toward landscapes and populations. One significant hazard is wildfires they ignite under regimes of low precipitation where little rainfall prevents fires when vegetation is dry. Direct damage caused by lightning strikes occurs occasionally in areas like Florida where several fatalities happen per year mostly to people working outside. Hail causes serious damage notably to automobiles aircraft skylights glass-roofed structures livestock and farmers' crops. When hail stones exceed one inch in diameter planes can be seriously damaged within seconds. Tornadoes come in many sizes but typically travel several kilometers before dissipating. Some attain wind speeds of more than 300 miles per hour stretching more than two miles across and staying on the ground for over 100 kilometers. Flash flooding occurs rapidly in slow-moving thunderstorms causing devastation to small infrastructure bridges weakly constructed buildings and agricultural crops.
Thunderstorms occur throughout the world even in polar regions with greatest frequency in tropical rainforest areas where they may occur nearly daily. At any given time approximately 2,000 thunderstorms are occurring on Earth simultaneously. Kampala and Tororo in Uganda have each been mentioned as the most thunderous places on Earth a claim also made for Singapore and Bogor on the Indonesian island of Java. Other cities known for frequent storm activity include Darwin Caracas Manila and Mumbai. Thunderstorms are associated with various monsoon seasons around the globe populating rainbands of tropical cyclones. In temperate regions they are most frequent in spring and summer although they can occur along or ahead of cold fronts at any time of year. Some of the most powerful thunderstorms over the United States occur in the Midwest and Southern states producing large hail and powerful tornadoes. Thunderstorms are relatively uncommon along much of the West Coast but occur with greater frequency in inland areas particularly Sacramento and San Joaquin Valleys of California.
Every spring storm chasers head to Great Plains of United States and Canadian Prairies to explore scientific aspects of storms through use of videotaping. Radio pulses produced by cosmic rays help study how electric charges develop within thunderstorms. More organized meteorological projects such as VORTEX2 use array of sensors including Doppler on Wheels vehicles with mounted automated weather stations weather balloons and unmanned aircraft to investigate expected severe weather. Lightning is detected remotely using sensors that detect cloud-to-ground lightning strokes with 95 percent accuracy in detection and within one kilometer of their point of origin. Weather radar tracks storms by using a prominent feature and tracking it from scan to scan. Past civilizations held various myths concerning thunderstorms and their development as late as the 18th century before advent of modern meteorological science.
Greeks believed thunderstorms were battles waged by Zeus who hurled lightning bolts forged by Hephaestus. Some American Indian tribes associated thunderstorms with Thunderbird whom they believed was servant of Great Spirit. Norse considered thunderstorms to occur when Thor went to fight Jötnar with thunder and lightning being effect of his strikes with hammer Mjölnir. Hinduism recognizes Indra as god of rain and thunderstorms while Christian doctrine accepts fierce storms are work of God. These ideas remained mainstream as late as 18th century. Martin Luther was out walking when thunderstorm began causing him to pray to God for being saved and promising to become monk. Outside Earth thunderstorms evidenced by flashes of lightning on Jupiter have been detected and are associated with clouds where water may exist as both liquid and ice suggesting mechanism similar to that on Earth. Clouds of Venus may also be capable of producing lightning with some observations suggesting rate is at least half of that on Earth.
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Common questions
How much water vapor does a typical thunderstorm lift into the Earth's atmosphere?
A typical thunderstorm lifts approximately 500 million kilograms of water vapor into the Earth's atmosphere. This moisture begins as warm air rising rapidly from the ground and condenses into liquid drops to form cumulus clouds.
What are the three distinct stages of every thunderstorm regardless of type?
Every thunderstorm goes through developing, mature, and dissipation stages that take an average of 30 minutes each within a single cell storm. The mature stage features simultaneous updrafts and downdrafts where strong winds severe lightning and tornadoes may occur before the dissipation stage cuts off growth.
Which cities have been identified as the most thunderous places on Earth?
Kampala and Tororo in Uganda have been mentioned as the most thunderous places on Earth alongside claims for Singapore and Bogor on the Indonesian island of Java. Other cities known for frequent storm activity include Darwin Caracas Manila and Mumbai while the Midwest and Southern states produce some of the most powerful storms in the United States.
What hazards do cloud-to-ground lightning and hail pose during thunderstorms?
Cloud-to-ground lightning frequently occurs within phenomena of thunderstorms posing numerous hazards toward landscapes and populations including wildfires and direct fatalities. Hail causes serious damage notably to automobiles aircraft skylights glass-roofed structures livestock and farmers' crops when stones exceed one inch in diameter.
How do researchers study electric charges and weather patterns within thunderstorms today?
Radio pulses produced by cosmic rays help study how electric charges develop within thunderstorms while projects like VORTEX2 use sensors including Doppler on Wheels vehicles and unmanned aircraft to investigate expected severe weather. Lightning is detected remotely using sensors that detect cloud-to-ground lightning strokes with 95 percent accuracy in detection and within one kilometer of their point of origin.