Which of the following options best explains the temporary cessation of rainfall during the southwest monsoon over parts of India?​

Correct option is D

Correct Answer: (D) Break in monsoon

Explanation:

• A "break in monsoon" refers to a temporary cessation or significant reduction of rainfall during the southwest monsoon season (June to September) over parts of India, especially the northwest and central regions.
• During this period, the monsoon trough shifts northwards towards the Himalayas, and rainfall decreases over the Indo-Gangetic plains, although it may continue in some parts of the northeast and southern Peninsula.

Information Booster:

• Breaks usually occur in July and August and can last for a few days to over a week.
• These breaks are often associated with weakening of monsoon winds and lack of low-pressure systems over the Bay of Bengal.
• Extended breaks can lead to drought-like conditions, especially in rain-fed agricultural regions.
• The Indian Meteorological Department (IMD) monitors these breaks closely for monsoon forecasting and agriculture planning.

Additional Information (Why other options are incorrect):

• (A) Easterly trough development – This may cause rainfall, not a cessation.
• (B) Cross-equatorial surge – Refers to moist air flow from the southern hemisphere, generally enhancing monsoon activity.
• (C) Subtropical jet interference – Affects winter weather, not a major factor in southwest monsoon rainfall breaks.