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In the month of August you prepare a flight (cruising level FL370) from Mumbai (19°N 73°E) to Bangkok (13°N 100°E). What wind conditions can you expect?
  • A
    Headwinds.
  • B
    Light winds diagonal to the route.
  • C
    Strong northerly winds.
  • D
    Tailwinds.

Refer to figure.
In a flight from Mumbai (19°N 73°E) to Bangkok (13ºN 100ºE) – flying easterly, in August => we will most likely encounter the seasonal easterly jet stream (EQUATORIAL JET STREAM). Even though its core is located at approx. FL450, at FL370 we will still experience headwinds from this jet. 
Tropical Easterly Jet (Equatorial Easterly Jet). A seasonal Strong easterly jet stream.

  • Occurs in the Northern Hemisphere’s summer (July-August) between 10° and 20° North, with core situated at high altitudes – usually between FL450 and FL500.
  • Notice that it is the only easterly jet stream. It can be found between SE Asia then passing over Southern India towards central Africa.
  • Wind speeds of 50 kts are typical, occasionally slightly higher, but seldom over 100 kts.

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