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  • Cherrapunjee Holiday Resorts, Cherrapunjee
Mesmeric Cherrapunjee
Analysis of Rainfall at Cherrapunjee
Observations about Rainfall at Cherrapunjee
How people live?
Cherrapunjee or Mawsynram
The Seasons
Formation of Heat Low
Near Equatorial Troughs, Mascarenas High, Corilis Force
Somali Jet Stream & Current and Tropical Jet Streams
The Tibetan High, Air Sea Interactions and Temperature Inversions
Movements of the Monsoon Trough and 'Breaks' in the Monsoon
Walker and Hadley Cells
El Nino and The Southern Oscillation (ENSO)
Withdrawal of the Monsoon
The Clouds
The Story of a Raindrop
Condensation Nuclei
The Mechanics of Rain Formation
Hailstones and Snowflakes
The Journey of Raindrop
Artificial Stimulation of Rainfall
Composition of Atmosphere and Variations in Temperature
Monsoon Depressions
An Appeal
Home » Monsoon Magic » Near Equatorial Troughs, Mascarenas High, Corilis Force 
Near Equatorial Troughs, Mascarenhas High, Corilis Force

Before the onset of the summer monsoon over India, a low-pressure zone forms on either side of the equator, roughly along 5ΒΊ N and 5ΒΊ S. Meteorologists refer to this as an equatorial double trough. The double trough is frequently observed in satellite observations of clouds. Prior to the onset of the monsoon, the near equatorial trough north of 5ΒΊ N weakens, but the trough near 5ΒΊ S remains fairly active.

In the southern hemisphere, off the coast of Madagascar there arises a zone of high pressure which is referred as the 'Mascarenes High. Around this Mascarenes High an anticyclonic air circulation becomes predominant. Opinion is still divided on what causes the air to accelerate round the Mascarenes High in an anti-clockwise direction. Some opine that this is brought about by the passage of migratory low-pressure systems off the coast of South Africa. The Indian Summer Monsoon, which is an unique annual meteorological phenomenon, starts its journey over 'Mascarenes High' near Madagascar in the southern hemisphere. The monsoon wind initially proceeds westward. As it crosses the equator, the spinning of the earth on its axis causes it to deflect towards north. This force has been named 'Coriolis Force'. On the surface of the earth, winds always try to blow from an area of high pressure (HP) towards an area of low pressure (LP) because of gradient force. Whilst blowing from HP areas to LP areas, the wind is deflected by Coriolis force or Geostrophic force. Coriolis force is minimum at the equator and increases as the latitude increases becoming maximum at the Poles. Coriolis force always acts at right angles to the direction in which the wind is blowing. It deflects the wind to their right in the northern hemisphere and to their left in the southern hemisphere

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