Easterly Jet Stream and Tropical Cyclones : The easterly jet stream steers the tropical depressions into India. These depressions play a significant role in the distribution of monsoon rainfall over the Indian subcontinent. The tracks of these depressions are the areas of highest rainfall in India.
Which jet streams is responsible for the burst of the Indian monsoon?
The burst of monsoons depends upon the upper air circulation which is dominated by Sub Tropical Jet Streams (STJ) . The south west monsoon coming in India is related to tropical easterly stream.
Which jet stream helps in the monsoon?
The Sub-Tropical Jet stream plays a significant role in both hindering the monsoon winds as well as in quick onset of Indian monsoons. During winter season the upper air westerly jet streams are positioned in Asia. These are bifurcated in two branches due to Tibet Himalayan obstruction.
What are easterly and westerly jet streams?
The major jet streams are westerly winds (flowing west to east) in the Northern Hemisphere. During the summer, easterly jets can form in tropical regions, typically in a region where dry air encounters more humid air at high altitudes. ... Meteorologists use the location of the jet stream as an aid in weather forecasting.
Which jet stream is important for the advent of summer monsoon in India?
Indian Monsoons – Role of Somali Jet
Important ones are Somali Jet and The African Easterly jet or Tropical Easterly Jet. These two jet streams play an important role in the formation and progression of Indian Monsoons.
What is jet stream Pmfias?
Jet streams are produced due to winds flowing from tropics towards poles (In polar jet streams wind flows from temperate region towards polar region, and in sub-polar jet streams winds flow from sub-tropics towards temperate region).
Why are cold deserts in India not affected by the monsoon?
Location. The cold deserts of India are located adjacent to the Himalaya Mountains. They are not affected by the Indian monsoons because they lie in the rain shadow of the Himalayas .
How jet stream are formed?
Jet streams form when warm air masses meet cold air masses in the atmosphere . ... So when Earth’s warmer air masses meet cooler air masses, the warmer air rises up higher in the atmosphere while cooler air sinks down to replace the warm air. This movement creates an air current, or wind.
How does jet stream affect Indian monsoon?
The Sub-Tropical Jet stream plays a significant role in both hindering the monsoon winds as well as in quick onset of Indian monsoons. The burst of monsoons depends upon the upper air circulation which is dominated by Sub Tropical Jet Streams (STJ). ... The easterly jet stream steers the tropical depressions into India.
What is jet stream Class 10?
Jet streams are winds that blow horizontally from west to east at a high speed near the tropopause and the stratosphere . These are high speed winds which influence the weather and climatic conditions of the region over which they blow.
What controls the jet stream?
The earth’s rotation is responsible for the jet stream as well. The motion of the air is not directly north and south but is affected by the momentum the air has as it moves away from the equator. The reason has to do with momentum and how fast a location on or above the Earth moves relative to the Earth’s axis.
What happens if the jet stream stops?
Without a jet, then, the whole pattern of global temperatures would be different , with the air cooling much more gradually across the latitudes. One of the clearest features of Earth’s climate, the striking temperature difference between equator and poles, would be gone.
What affects the jet stream?
The factors that influence the flow of the jet stream are the landmasses and the Coriolis effect . Landmasses interrupt the flow of the jet stream through friction and temperature differences, whilst the spinning nature of the earth accentuates these changes.
How does the jet stream affect weather?
The jet stream flows high overhead and causes changes in the wind and pressure at that level . This affects things nearer the surface, such as areas of high and low pressure, and therefore helps shape the weather we see. Sometimes, like in a fast-moving river, the jet stream’s movement is very straight and smooth.
Why are jet streams Westerly?
Jet streams are fast flowing, narrow bands of wind in the upper atmosphere that circle their way around the globe. They are predominantly westerly winds due to the rotation and relative movement of the Earth , however due to their meandering path, they sometimes veer north or south. ...
Are jet streams permanent?
Permanent jet streams. There are two permanent jet streams – subtropical jets at lower latitudes and polar front jets at mid-latitudes .
