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Tropical cyclones are classified into different stages based on their intensity, wind speeds, and structural characteristics. These classifications help meteorologists assess the severity of a storm and provide the public with the necessary warnings. While the term "typhoon" is used for storms in the Northwest Pacific, "hurricane" is used in the Atlantic and Northeast Pacific, and "cyclone" is used in the South Pacific and Indian Ocean, they all refer to the same weather phenomenon— a rotating system of clouds and thunderstorms
For Typhoons via Zoom.earth
For Typhoons via Zoom.earth
Tropical Depression (D)
The Tropical Depression is the initial stage of a developing tropical cyclone, where the system shows a weak low-pressure area. The winds are light, generally below 34 knots (63 km/h or 39 mph), and the system lacks a well-defined circulation. The storm is not yet well-formed, and cloud patterns are disorganized. There may be some convective activity (thunderstorms), but it is not structured enough to form a clear eye or strong wind bands.
Tropical Storm
(S)
As the system intensifies, it strengthens into a Tropical Storm. This stage is marked by more organized cloud bands, increased convection (thunderstorms), and stronger winds. The system shows better organization and starts exhibiting spiral cloud bands that revolve around a loosely defined center. While the eye is still absent, the system begins to show some rotation, and the winds increase.
Severe Tropical Storm (SS)
A Severe Tropical Storm is a significantly stronger storm, where the winds increase further, and the storm structure becomes more tightly packed. At this point, the cyclone becomes more symmetrical, and the central area of low pressure starts to intensify. The system’s rotation becomes more evident, with a better-defined circulation and stronger, more organized rainbands surrounding the center.
Typhoon (T)
A Typhoon is a fully developed tropical cyclone, characterized by a well-defined structure. This stage is marked by the formation of a clear eye surrounded by a dense, intense eyewall of thunderstorms. The storm has reached a much higher intensity, with winds that can cause significant damage. The system has a well-organized rotation and exhibits clear spiral cloud bands. This is a major stage where the storm begins to be considered dangerous, depending on its size and location.
Very Strong Typhoon (ST)
At this stage, the Typhoon strengthens significantly, becoming a Very Strong Typhoon. The system grows in size and intensity, and the eyewall becomes more intense and expansive. The storm is capable of causing major damage, including significant flooding, high winds, and storm surges. The central eye becomes more pronounced, and cloud banding increases as the storm strengthens.
Violent Typhoon (VT)
A Violent Typhoon is a highly intense storm, characterized by extreme wind speeds and the potential for catastrophic damage. The system continues to intensify, with extreme wind gusts, heavy rainfall, and a rapidly expanding eyewall. The eye is extremely well-defined and may grow larger, indicating the system’s intensity.
Super Typhoon (SU)
Super Typhoon (SU)
The Super Typhoon is the most intense classification for a typhoon. The storm’s winds can reach unprecedented speeds, and its size and structure are immense. Super typhoons are capable of widespread devastation, with severe damage to infrastructure, massive storm surges, and extreme rainfall. These storms can have a profound impact on coastal regions and even extend far inland.
For Cyclones via Zoom.earth
For Cyclones via Zoom.earth
Deep Depression (DD)
A Deep Depression is a weak tropical cyclone that brings light to moderate wind and rainfall. It typically causes minimal damage but may lead to localized flooding or disruption in affected areas.
Cyclonic Storm (C)
A Cyclonic Storm is a moderate tropical cyclone that can cause damage to weak structures and infrastructure. It is capable of producing heavy rainfall, strong winds, and localized flooding, making coastal and low-lying areas particularly vulnerable.
Severe Cyclonic Storm (SC)
A Severe Cyclonic Storm is a powerful tropical cyclone that can cause significant damage, including the destruction of weak buildings, uprooting of trees, and disruption of essential services. It also brings heavy rainfall and the potential for severe flooding.
Extremely Severe Cyclonic Storm (EC)
An Extremely Severe Cyclonic Storm is a highly destructive cyclone that brings catastrophic damage. It can cause extensive damage to buildings and infrastructure, with widespread flooding and life-threatening conditions in affected areas.
Super Cyclonic Storm (SU)
A Super Cyclonic Storm is the highest level of tropical cyclone intensity, capable of causing catastrophic and widespread devastation. These storms bring extreme wind, heavy rainfall, and massive storm surges, resulting in large-scale destruction and potentially life-threatening conditions.
For Hurricanes via Zoom.earth
For Hurricanes via Zoom.earth
Tropical Depression (D)
A Tropical Depression is a weak tropical cyclone with minimal wind intensity, often bringing light to moderate rainfall. It typically does not cause significant damage but may lead to localized flooding and disruption.
Tropical Storm (S)
A Tropical Storm is a stronger system with sustained winds capable of causing moderate damage. It brings heavy rainfall, gusty winds, and can lead to flooding, especially in low-lying areas. It may cause some structural damage, particularly to weaker buildings.
Category 1 Hurricane (H1)
A Category 1 Hurricane is a relatively weak hurricane but still capable of causing minor damage, especially to unanchored mobile homes, trees, and shrubbery. Coastal flooding and power outages may occur, and some structural damage is possible.
Category 2 Hurricane (H2)
A Category 2 Hurricane is a strong storm that can cause significant damage. Well-built homes may experience damage to roof and siding, with the potential for extensive power outages. Coastal flooding and storm surge can also lead to dangerous conditions.
Category 3 Major Hurricane (H3)
A Category 3 Major Hurricane is a highly dangerous storm capable of causing devastating damage. Well-built homes may be severely damaged, with the possibility of complete structural failure in some areas. Flooding, storm surge, and power outages can last for days or even weeks.
Category 4 Major Hurricane (H4)
A Category 4 Major Hurricane is an extremely dangerous storm that can cause catastrophic damage. Most trees will be snapped or uprooted, and power poles will be downed. Residential areas can be isolated due to fallen trees and power poles, with significant damage to buildings and infrastructure.
Category 5 Major Hurricane (H5)
A Category 5 Major Hurricane is the most intense and destructive storm. It can cause catastrophic damage, with a high percentage of framed homes destroyed, and total power loss in affected areas. Storm surges can flood large sections of coastal areas, and severe damage to infrastructure is expected.
Cloud Cluster Low Pressure Area
A Cloud Cluster Low Pressure Area (often referred to as a "low-pressure system") is a region where a cluster of clouds forms around a central area of lower atmospheric pressure. These systems are usually associated with thunderstorms or rain and are considered the early stages of tropical cyclone development. While they typically do not have the well-defined structure of a full tropical cyclone, they can still bring significant rainfall and thunderstorms to affected areas.
Extratropical Cyclone or Remnant Low
An Extratropical Cyclone is a storm system that forms outside the tropics, typically in temperate regions, and is no longer a warm-core system like a tropical cyclone. It is often associated with cold fronts and is driven by temperature contrasts. These systems can still produce strong winds, heavy rainfall, and snow in some cases, but they no longer have the characteristic features of tropical cyclones.
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