Multiple Choice Questions

Consider the following statements regarding Western Disturbances They are cyclonic storms that form ...........

Geography and Environment (UPPCS) World climates

Consider the following statements regarding Western Disturbances

They are cyclonic storms that form over land.
A Western Disturbance is in the shape of a spiral with a narrow mouth at the bottom and a wide mouth at the top.
It brings sudden winter rain to the northern portions of the Indian subcontinent.
This extratropical storm has its origins in the Aegean Sea.

Select the correct statement.

1,2&4 only

1,2&3 only

2&4 only

1,3&4 only

Only statements 1,2&3 are correct.

Western Disturbances originate in the Mediterranean region and travel over Iran, Iraq, Afghanistan and Pakistan to enter India loaded with moisture
Western Disturbances are cyclonic storms that form over land, and they occur mostly in the Mediterranean region due to a temperature gradient caused by the mixing of warm air from the tropics and cold air from the northern polar-regions.
They occasionally form as far as in Alaska or the Arctic region, according to a research paper published in the Quarterly Journal of the Royal Meteorological Society in 2018.
A Western Disturbance is in the shape of a spiral with a narrow mouth at the bottom (formed at a height of about 5,500 metres above sea level) and a wide mouth at the top (formed at a height of more than 9,000 metres above sea level).
While the storm systems occur throughout the year, they travel to India mostly between December and April because the trajectory of the subtropical westerly jet stream, which transports them, shifts during the winter months to the rim of the Himalayas.
For the rest of the year, the jet stream travels from above the Himalayas to the Tibetan Plateau and China. The trajectory of the jet stream changes as per the position of the Sun.