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Winds storms and cyclones ppt

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Winds,storms and cyclones
In meteorology, a cyclone is an area of closed,
circular fluid motion rotating in the same
direction as the Earth. This is usually
characterized by inward spiraling winds that
rotate counterclockwise in the Northern
Hemisphere and clockwise in the Southern
Hemisphere of the Earth. Most large-scale
cyclonic circulations are centered on areas of
low atmospheric pressure. The largest low-
pressure systems are cold-core polar cyclones
and extratropical cyclones which lie on the
synoptic scale. According to the National
Hurricane Center glossary, warm-core cyclones
such as tropical cyclones and subtropical
cyclones also lie within the synoptic
scale.Mesocyclones, tornadoes and dust devils
lie within the smaller mesoscale.
Formation of cyclones
The main source of energy for tropical cyclones is
the warm oceans in the tropical regions. To initiate
a tropical cyclone the sea-surface temperature
generally needs to be above 26.5°C. However,
existing cyclones often persist as they move over
cooler waters.
The development of a tropical cyclone also relies
on favourable broad-scale wind regimes and can
persist for several days with many following quite
erratic paths. They lose their source of energy
when they move over land or colder oceans causing
them to dissipate. Weakening may also occur if the
cyclone moves into an unfavourable wind regime
which disrupts the structure of the system.
Sometimes a decaying tropical cyclone may
interact with a weather system in higher latitudes
to cause impacts far from the tropics.
The main effects of cyclones include
heavy rain, strong wind, large storm
surges at landfall, and tornadoes. The
destruction from a cyclone depends
mainly on its intensity, its size, and its
location. cyclones act to remove forest
canopy as well as change the landscape
near coastal areas, by moving and
reshaping sand dunes and causing
extensive erosion along the coast. Even
well inland, heavy rainfall can lead to
mudslides and landslides in mountainous
areas. Their effects can be sensed over
time by studying the concentration of the
Oxygen-18 isotope within caves within
the vicinity of cyclones' paths.
A storm is any disturbed state of an environment or
astronomical body's atmosphere especially affecting its
surface, and strongly implying severe weather. It may be
marked by significant disruptions to normal conditions such
as strong wind, hail, thunder and lightning (a thunderstorm),
heavy precipitation (snowstorm, rainstorm), heavy freezing
rain (ice storm), strong winds (tropical cyclone, windstorm),
or wind transporting some substance through the
atmosphere as in a dust storm, blizzard, sandstorm, etc.
Storms generally lead to negative impacts on lives and
property such as storm surge, heavy rain or snow (causing
flooding or road impassibility), lightning, wildfires, and
vertical wind shear; however, systems with significant rainfall
can alleviate drought in places they move through. Heavy
snowfall can allow special recreational activities to take place
which would not be possible otherwise, such as skiing and
snowmobiling.
A tornado is a violently rotating column of air that is in
contact with both the surface of the earth and a
cumulonimbus cloud or, in rare cases, the base of a
cumulus cloud. They are often referred to as twisters or
cyclones, although the word cyclone is used in
meteorology, in a wider sense, to name any closed low
pressure circulation. Tornadoes come in many shapes
and sizes, but they are typically in the form of a visible
condensation funnel, whose narrow end touches the
earth and is often encircled by a cloud of debris and
dust. Most tornadoes have wind speeds less than 110
miles per hour (180 km/h), are about 250 feet (80 m)
across, and travel a few miles (several kilometers) before
dissipating. The most extreme tornadoes can attain wind
speeds of more than 300 miles per hour (480 km/h),
stretch more than two miles (3 km) across, and stay on
the ground for dozens of miles (more than 100 km)

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Winds storms and cyclones ppt

  • 2. In meteorology, a cyclone is an area of closed, circular fluid motion rotating in the same direction as the Earth. This is usually characterized by inward spiraling winds that rotate counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere of the Earth. Most large-scale cyclonic circulations are centered on areas of low atmospheric pressure. The largest low- pressure systems are cold-core polar cyclones and extratropical cyclones which lie on the synoptic scale. According to the National Hurricane Center glossary, warm-core cyclones such as tropical cyclones and subtropical cyclones also lie within the synoptic scale.Mesocyclones, tornadoes and dust devils lie within the smaller mesoscale.
  • 3. Formation of cyclones The main source of energy for tropical cyclones is the warm oceans in the tropical regions. To initiate a tropical cyclone the sea-surface temperature generally needs to be above 26.5°C. However, existing cyclones often persist as they move over cooler waters. The development of a tropical cyclone also relies on favourable broad-scale wind regimes and can persist for several days with many following quite erratic paths. They lose their source of energy when they move over land or colder oceans causing them to dissipate. Weakening may also occur if the cyclone moves into an unfavourable wind regime which disrupts the structure of the system. Sometimes a decaying tropical cyclone may interact with a weather system in higher latitudes to cause impacts far from the tropics.
  • 4. The main effects of cyclones include heavy rain, strong wind, large storm surges at landfall, and tornadoes. The destruction from a cyclone depends mainly on its intensity, its size, and its location. cyclones act to remove forest canopy as well as change the landscape near coastal areas, by moving and reshaping sand dunes and causing extensive erosion along the coast. Even well inland, heavy rainfall can lead to mudslides and landslides in mountainous areas. Their effects can be sensed over time by studying the concentration of the Oxygen-18 isotope within caves within the vicinity of cyclones' paths.
  • 5. A storm is any disturbed state of an environment or astronomical body's atmosphere especially affecting its surface, and strongly implying severe weather. It may be marked by significant disruptions to normal conditions such as strong wind, hail, thunder and lightning (a thunderstorm), heavy precipitation (snowstorm, rainstorm), heavy freezing rain (ice storm), strong winds (tropical cyclone, windstorm), or wind transporting some substance through the atmosphere as in a dust storm, blizzard, sandstorm, etc. Storms generally lead to negative impacts on lives and property such as storm surge, heavy rain or snow (causing flooding or road impassibility), lightning, wildfires, and vertical wind shear; however, systems with significant rainfall can alleviate drought in places they move through. Heavy snowfall can allow special recreational activities to take place which would not be possible otherwise, such as skiing and snowmobiling.
  • 6. A tornado is a violently rotating column of air that is in contact with both the surface of the earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud. They are often referred to as twisters or cyclones, although the word cyclone is used in meteorology, in a wider sense, to name any closed low pressure circulation. Tornadoes come in many shapes and sizes, but they are typically in the form of a visible condensation funnel, whose narrow end touches the earth and is often encircled by a cloud of debris and dust. Most tornadoes have wind speeds less than 110 miles per hour (180 km/h), are about 250 feet (80 m) across, and travel a few miles (several kilometers) before dissipating. The most extreme tornadoes can attain wind speeds of more than 300 miles per hour (480 km/h), stretch more than two miles (3 km) across, and stay on the ground for dozens of miles (more than 100 km)
  • 7. As the mesocyclone lowers below the cloud base, it begins to take in cool, moist air from the downdraft region of the storm. This convergence of warm air in the updraft, and this cool air, causes a rotating wall cloud to form. The RFD also focuses the mesocyclone's base, causing it to siphon air from a smaller and smaller area on the ground. As the updraft intensifies, it creates an area of low pressure at the surface. This pulls the focused mesocyclone down, in the form of a visible condensation funnel. As the funnel descends, the RFD also reaches the ground, creating a gust front that can cause severe damage a good distance from the tornado. Usually, the funnel cloud begins causing damage on the ground (becoming a tornado) within a few minutes of the RFD reaching the ground.
  • 8. Tornadoes effect the environment by destroying buildings and trees. Tornadoes also kill animals, which effects the food chain and disrupts the whole environment. Tornadoes destroy our farms, which means there will be food shortages around the surrounding area. After everything is destroyed, humans have to rebuild. Tornadoes can cause water contamination, which poses a serious problem, as plants, animals and humans are effected by this. Debris can be very dangerous, as it could kill plants and animals very easily. Some trees take over 100 years to grow, so if they are destroyed, they will be hard to replace. Fires may occur after a tornado due to damaged power lines and gas leaks. Fire contributes to global warming by giving off carbon dioxide into the atmosphere. Because of man-made global warming, scientists believe that there will be an increases in tornadoes and other severe weather
  • 9. Average speed The average speed of a cyclone is 200-280 kmph The average speed of a tornado is 48-112 kmph The highest speed of cyclone ever recorded was 408 kmph The highest speed of tornado ever recorded was 511 kmph
  • 10. The 1999 Odisha cyclone, also known as Cyclone 05B, and Paradip cyclone,[1] was the strongest tropical cyclone ever recorded in the North Indian Ocean. It was also the deadliest tropical cyclone in the Indian Ocean since the 1991 Bangladesh cyclone, and deadliest Indian storm since 1971. The Category 5 storm made landfall just weeks after a Category 4 storm hit the same general area. It was a tropical depression formed over the Malay Peninsula on October 25. It moved to the northwest and became a tropical storm on October 26. It continued to strengthen into a cyclone on October 27. On October 28, it became a severe cyclone with a peak of 160 mph (260 km/h) winds. It hit India the next day as a 155 mph (250 km/h) cyclone. It caused the deaths of about 10,000 people, and heavy to extreme damage in its path of destruction.