Question

what are jet streams? how do they help to cause rain in Punjab and western Himalayas during winter​

Answer 1

Answer:

Jet streams are relatively narrow bands of strong wind in the upper levels of the atmosphere. The winds blow from west to east in jet streams but the flow often shifts to the north and south. Jet streams follow the boundaries between hot and cold air. ... The earth's rotation is responsible for the jet stream as well

The easterly jet stream steers the tropical depressions into India. These depressions play a critical role in distribution of monsoon rainfall over the Indian subcontinent. ... However, the subtropical jet stream occupies its winter position at about 30 degree N latitude, south of the Himalayan Mountains in 200 hPa