Inflow of cyclonic disturbances from the west and northwest.
Explanation
The cold weather season in India (mid-November to February) is characterized by high pressure over the northern plains, low temperatures, and specific weather phenomena influenced by upper-air circulation patterns, particularly the Westerly Jet Stream.Option Analysis:
- Inflow of cyclonic disturbances from the west and northwest. is Correct: A distinct feature of the cold weather season in the Northern Plains is the inflow of Western Cyclonic Disturbances. These are temperate cyclones that originate over the Mediterranean Sea and Western Asia and are transported into India by the westerly flow. They cause winter rainfall in the plains and snowfall in the Himalayas.
- Strong, hot, dry winds blowing during the day. is Incorrect: Strong, gusty, hot, dry winds blowing during the day, known as Loo, are a characteristic feature of the Summer season (May and June), not the winter season.
- Heavy rainfall caused by the South-West Monsoon. is Incorrect: The South-West Monsoon brings rainfall during the rainy season (June to September). The cold weather season is generally dry in most parts of the country, except for precipitation from Western Disturbances in the north and the North-East Monsoon in the southeast coast.
- Uniformly high temperatures. is Incorrect: The Northern Plains experience a continental climate with significant seasonal temperature variations. During the cold weather season, temperatures are low (mean daily temperatures often below 21°C), rather than uniformly high.
Key Takeaway: The Western Cyclonic Disturbances are the primary source of winter precipitation in North-West India, which is critically important for the cultivation of Rabi crops (such as wheat).