Retreating/Post Monsoons – Long Answer Questions

Medium Level (Application & Explanation)

Q1. Explain how the southward movement of the sun in October–November leads to the withdrawal of the monsoon from the Northern Plains.

Answer:

In October–November, the sun appears to move towards the south.
This weakens the monsoon trough over north India.
The weak trough gets replaced by a high-pressure system over land.
Winds lose moisture and begin to retreat from the Northern Plains by early October.
Dry continental winds start blowing, and the rainy season ends.
This marks the transition from a wet season to a dry winter.

Q2. Describe the typical weather during the retreating monsoon. Why is it called ‘October heat’?

Answer:

The skies are mostly clear after the rains withdraw.
Daytime temperatures rise sharply due to strong sunlight.
The land is still moist, so humidity remains high.
This mix of heat and humidity causes oppressive discomfort.
People call this the ‘October heat’.
Nights, however, turn cool and pleasant due to faster heat loss.

Q3. How do temperatures change in northern India from early October to mid-November? What does this indicate?

Answer:

In early October, days may still be hot, but nights are cooler.
By mid-October, there is a rapid fall in temperatures in the north.
Dry winds and clear skies help quick cooling at night.
The weather becomes steadily cooler as winter nears.
People adjust clothing and reduce cooling needs.
This change shows the end of monsoon and the start of dry winter conditions.

Q4. Explain how cyclonic depressions form during this season and which areas they affect.

Answer:

By early November, low-pressure areas shift to the Bay of Bengal.
Cyclonic depressions often form over the Andaman Sea and adjoining Bay.
They gather moisture and move towards the eastern coast.
Regions like Odisha, West Bengal, Andhra Pradesh, and Tamil Nadu are at risk.
The Godavari, Krishna, and Kaveri deltas often get heavy rain.
Such systems can bring destructive rainfall and strong winds.

Q5. Why does the Coromandel Coast get most of its rain during the retreating monsoon?

Answer:

The Coromandel Coast lies along Tamil Nadu on the eastern side.
In this season, winds and depressions/cyclones come from the Bay of Bengal.
These systems bring heavy rain to the east coast.
The region receives its main rain now, not in the earlier SW monsoon.
Hence, the Coromandel Coast depends on cyclones and depressions for rain.
This seasonal pattern supports local agriculture and water storage.

High Complexity (Analysis & Scenario-Based)

Q6. You are planning a school fair in Delhi in the first week of October. Analyse the weather risks and suggest practical arrangements.

Answer:

Expect clear skies but hot days due to ‘October heat’.
Humidity is still high as the land remains moist.
Plan events in the morning or late afternoon to avoid peak heat.
Keep shade, water stations, and first-aid for heat stress.
Check for any late thundershowers, though rain chances are low.
Arrange fans and coolers; prefer airy and open layouts.

Q7. A farmer in the Godavari delta hears a cyclone warning in early November. What steps should he take, and why?

Answer:

Secure pumps, tools, and seed in safer, higher places.
If crops are mature, do early harvest to reduce losses.
Clear drainage to reduce waterlogging from heavy rain.
Protect livestock, fodder, and arrange safe shelters.
Keep emergency kits, documents, and follow evacuation orders.
These steps reduce damage from cyclonic depressions and floods.

Q8. Compare the retreating monsoon’s impact on the Northern Plains and Tamil Nadu. Give reasons for the differences.

Answer:

In the Northern Plains, the monsoon withdraws by early October.
The north then turns dry and cooler, with falling temperatures.
In Tamil Nadu, rains continue due to Bay of Bengal systems.
Cyclones and depressions bring heavy rain to the Coromandel Coast.
Thus, north sees a shift to dry winter, while Tamil Nadu gets its main rains.
The difference comes from the origin and path of these post-monsoon systems.

Q9. A satellite shows a low-pressure system over the Andaman Sea moving northwest in early November. Predict impacts on the eastern coast and suggest precautions.

Answer:

Likely cyclonic depression may strengthen over the Bay of Bengal.
Possible landfall along Odisha, Andhra Pradesh, or North Tamil Nadu coast.
Expect heavy rain, strong winds, and urban flooding near coast.
Deltas of Godavari, Krishna, Kaveri face high flood risk.
Precautions: suspend fishing, secure boats, clear drains, and stock essentials.
Authorities should prepare evacuation plans and alert coastal villages.

Q10. How does the retreating monsoon affect water availability and agriculture? Suggest short-term strategies for communities.

Answer:

After withdrawal, days are hot, but the land stays moist for a while.
This helps soil moisture and supports rabi sowing in some areas.
Cyclonic rains recharge ponds, tanks, and reservoirs on the east coast.
But excessive rain can cause floods, waterlogging, and crop loss.
Short-term steps: repair bunds, improve drainage, and store excess water.
Communities should plan crop calendars, protect seeds, and use early warnings.

Happy learning! Focus on the keywords: southward sun, weakening monsoon trough, high pressure, October heat, Bay of Bengal depressions, Coromandel Coast rainfall.