The Cyclones Notes with PDF

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Jet Streams

• Definition & Occurrence:
  • Jet streams are not confined to the Northern Hemisphere; they also occur in the Southern Hemisphere.

Cyclones (General Structure & Characteristics)

• The Eye of the Cyclone:
  • Only some cyclones develop an eye.
  • The temperature inside the eye is warmer than the surrounding storm area (a statement claiming it is 10°C cooler is incorrect).
• Wind Patterns:
  • Surface winds spiral inwards towards the center of the cyclone.
• Pressure & Weather Indication:
  • A sudden fall in the barometric (mercury) reading indicates the approach of stormy weather.

Tornadoes

• Origin:
  • Tornadoes are very strong tropical cyclones originating in the Caribbean Sea region.
• Tornado Alley:
  • The Mississippi Plains region in the U.S.A. is known as “Tornado Alley.”
• Measurement Scale:
  • The intensity of tornadoes is measured using the Fujita Scale.

Regional Names for Tropical Cyclones

Different regions have specific names for the same weather phenomenon:

• Australia: Willy-Willy
• China & Japan: Typhoon (Taifu is the Japanese term)
• India: Cyclone
• USA: Hurricane
• Philippines: Baguio

Measurement Scales for Cyclones

• Hurricanes: Measured on the Saffir-Simpson Scale (intensity and potential damage).
• Tornadoes: Measured on the Fujita Scale.

Specific Cyclones and Their Impact

• Cyclone Nargis (2008): Severely affected Myanmar, not India.
• Notable Storms (August-September 2019) and Most Affected Countries:
  • Dorian: Bahamas
  • Hagibis: Japan
  • Lekima: China
  • Mitag: Jeju, South Korea

Factors Influencing Cyclone Formation

• Tropical cyclones do not originate in the South Atlantic and South-Eastern Pacific regions.
• Primary Reason: The Inter-Tropical Convergence Zone (ITCZ), which is crucial for cyclone genesis, seldom occurs over these areas.

Climate Change and Cyclones

• Due to global warming, the frequency and severity of all tropical cyclones (cyclones, storms, hurricanes) are increasing.

Know More About The Cyclones:

• The Cyclones – Old Year Questions
• The Cyclones One Liner Questions & Answers