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Relevance: GS-I (Geography) | GS-III (Disaster Management) | Source: The Hindu

The Context: Cyclone Arnab is barreling toward India’s eastern coast, triggering massive rescue operations across Andhra Pradesh and Odisha. With the weather department (IMD) issuing urgent red alerts for 7 districts in Andhra Pradesh, authorities are racing against the clock to pull back over 30,000 fishing boats and shift thousands of vulnerable people to safety before the storm strikes.

1. The Anatomy of Cyclone Arnab

Arnab isn’t just a regular rainstorm. Its exact timing with the moon’s cycle creates a dangerous geographical trap for coastal villages and towns.

  • Fierce Winds & Rain: Classified as a “very severe cyclonic storm,” Arnab is set to crash into the coast near Kakinada or Yanam in Andhra Pradesh with destructive wind gusts reaching 140 kmph. If the storm curves toward Chhattisgarh, the heavy downpour will cause the massive Mahanadi River to swell and overflow.
  • The Full Moon Trap (Backwater Effect): Normally, swollen rivers drain their extra rainwater straight into the sea. However, Arnab is hitting right around a full moon day. Because the moon’s gravity pulls the ocean water higher, the sea tide acts like a giant liquid wall. Instead of draining out, the river water gets blocked and pushed backward, flooding coastal towns from both sides.

2. Saving Lives First: The Ground Response

India’s disaster playbook has shifted from simply counting losses after a storm to aggressively aiming for “zero casualties” before it even lands.

  • Protecting Mothers: In a brilliant example of humane disaster planning, Andhra Pradesh and Odisha are specifically tracking and moving over 7,700 pregnant women (4,711 in AP and around 3,000 in Odisha) from remote villages straight to safe hospitals well before roads get cut off.
  • Massive Mobilisation: Over 1,700 cyclone shelters are ready in southern districts of Odisha like Malkangiri and Koraput, while 41 power control rooms are active in Andhra to quickly fix snapped electricity lines. Dozens of rescue teams from the NDRF, SDRF, and Odisha’s ODRAF—backed by the Army and Navy on standby—are positioned on the ground.

Value Box: Key Disaster Frameworks
Disaster Management Act, 2005 The master law that created the NDRF and gives top officials (like the Cabinet Secretary) the legal power to coordinate immediate central help, military support, and funds when a state faces a severe natural calamity.
IMD Colour Alerts The India Meteorological Department uses four colour codes (Green, Yellow, Orange, Red) to signal danger. A Red Alert is the highest warning, telling authorities to “Take Action” immediately to evacuate people and halt normal transport.
Spring Tides During a full moon or new moon, the Sun, Earth, and Moon line up in a straight line. Their combined gravitational pull creates extra-high ocean tides known as “spring tides,” which severely worsen cyclone storm surges.

Practice MCQ

Q. Consider the following statements regarding cyclonic impacts and disaster management in India:

  1. When a cyclone makes landfall on a full moon day, the heightened gravitational pull lowers the sea tide, allowing inland floodwater to drain faster into the ocean.
  2. The National Disaster Response Force (NDRF) is a statutory force constituted under the Disaster Management Act, 2005, for specialized response to natural and man-made disasters.

Which of the statements given above is/are correct?

(a) 1 only     (b) 2 only     (c) Both 1 and 2     (d) Neither 1 nor 2

Answer: (b) 2 only
Hint: Statement 1 is incorrect because a full moon creates much higher tides (spring tides), which block swollen rivers from draining into the sea and cause severe inland flooding. Statement 2 is correct; the NDRF gets its legal backing directly from the 2005 Act.

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