⚠️ Cyclonic Storm ‘Ditwah’ Intensifies: Major Weather Disruptions Expected Across South India & Bay of Bengal (29th Nov – 1st Dec)

A rapidly intensifying Cyclonic Storm ‘Ditwah’ over the Southwest Bay of Bengal, adjoining Sri Lanka coast, is set to influence the weather over several states and marine regions from 29th November to 1st December 2025. The system is bringing a combination of extremely heavy rainfall, thunderstorms, gale-force winds, rough to very rough sea conditions, and potential storm surge, posing high risk to coastal communities, fishermen, and marine operations.

This detailed blog presents a region-wise analysis, system dynamics, and day-by-day expectations for better preparedness.

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🌪️ SYSTEM UPDATE: Cyclonic Storm DITWAH

Current Status

• The Cyclonic Storm Ditwah lies over the coastal Sri Lanka region and adjoining Southwest Bay of Bengal.

• The system is intensifying under favorable conditions, including:

  • High sea surface temperatures,

  • Strong low-level vorticity,

  • Enhanced moisture inflow from Indian Ocean,

  • Strong upper-level divergence.

Expected Movement

• Ditwah is expected to move northwestward, coming closer to the Tamil Nadu and Andhra Pradesh coasts between 29th Nov – 1st Dec.

• Gale winds along its periphery will impact Sri Lanka, Tamil Nadu, Andhra Pradesh, Puducherry, and the entire Southwest Bay.

Impact Timeline

• 29th Nov: Peak intensification; heavy to extremely heavy rainfall begins.

• 30th Nov: System remains strong; widespread dangerous sea conditions.

• 1st Dec: Gradual weakening but residual rough sea/wind conditions persist.

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🌧️ RAINFALL FORECAST & WARNINGS

Tamil Nadu

• 29th–30th November:

  • Extremely heavy rainfall likely over Tamil Nadu under direct influence of Ditwah.

  • Coastal regions may experience flooding, waterlogging, and local landslides.

• Thunderstorm with lightning expected throughout the period.

Andhra Pradesh & Yanam / Rayalaseema

• 29th Nov – 1st Dec:

  • Isolated very heavy to extremely heavy rainfall likely, especially over coastal Andhra Pradesh and Rayalaseema.

  • Risk of river swelling and flash flooding.

Kerala & Mahe

• 29th November: Isolated heavy rainfall.

• Thunderstorms with lightning on 29th & 30th Nov.

South Interior Karnataka

• 29th–30th November: Isolated heavy rainfall.

Telangana

• 30th November: Isolated heavy rainfall expected.

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🌡️ TEMPERATURE OUTLOOK

• Northwest India:

  • No major change for 48 hours; then drop by 2–4°C.

• Central India:

  • Stable for 48 hours; then rise of 2–3°C.

• East India:

  • Stable for four days; then fall by 2–3°C.

• Maharashtra:

  • Slight rise in next 3 days.

• Gujarat & Rajasthan:

  • No change for 48 hours; then increase by 3–4°C.

• Northeast India:

  • No major change for next 5 days.

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🌫️ DENSE FOG & COLD WAVE WARNINGS

Dense Fog

• Likely on early mornings over:

  • Himachal Pradesh (29 Nov – 1 Dec)

  • Haryana, Chandigarh, Delhi (29 & 30 Nov)

  • East Rajasthan (30 Nov – 1 Dec)

Cold Wave

• Likely in isolated pockets of Rajasthan from 3rd–5th December.

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🌬️ WIND WARNING (Severe to Gale Winds)

Southwest Bay of Bengal, Gulf of Mannar, Comorin Area, Sri Lanka Coast

• Wind Speed: 65–75 kmph gusting to 85 kmph.

• 29th–30th Nov: Gale winds intensifying to 70–80 kmph gusting 90 kmph.

• Gradual decrease from 1st December, but squally winds persist.

North Tamil Nadu & Puducherry Coasts

• 29th Nov – 1st Dec: 60–80 kmph gusting to 80+ kmph.

• Severe risk of tree uprooting and structural damage.

South Tamil Nadu Coast

• 29th Nov – 30th Nov: 60–70 kmph gusting to 80 kmph.

Westcentral Bay & Andhra Pradesh Coast

• Winds increasing to Gale force (60–80 kmph) from 29th evening – 30th morning.

Southeast Arabian Sea, Lakshadweep, Maldives, Kerala Coast

• 29th Nov: 45–55 kmph gusting to 65 kmph.

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🌊 SEA CONDITION WARNING

Extremely Dangerous Sea Conditions

• Southwest Bay of Bengal, Sri Lanka coast, Gulf of Mannar, Comorin area

  • Very rough to high sea till 30th Nov.

  • Gradual improvement from 1st Dec.

North Tamil Nadu & Puducherry Coasts

• Very rough to high sea till 30th Nov midnight.

South Tamil Nadu Coast

• Very rough till 30th Nov, then decreasing gradually.

Westcentral Bay & South Andhra Pradesh Coast

• Moderate to very rough sea till 30th Nov, improving from 1st Dec.

Southeast Arabian Sea, Lakshadweep, Maldives, Kerala Coast

• Rough sea on 29th November.

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🌊 STORM SURGE WARNING

• Coastal areas of northern Sri Lanka likely to experience
  storm surge of 1.0–1.5 meters above normal tide on 29th November.

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🚫 FISHERMEN ADVISORY: RED ALERT

Total Suspension of Fishing

• Sri Lanka, Tamil Nadu, Puducherry, South Andhra Pradesh
  till 1st December.

Fishermen Must Not Venture Into:

1. Southwest Bay, Gulf of Mannar, Comorin area, Tamil Nadu, Puducherry, Sri Lanka coasts – till 1st Dec.

2. Westcentral Bay & Andhra Pradesh coast – till 1st Dec.

3. Southeast Arabian Sea, Lakshadweep, Maldives, Kerala coast – 29th Nov.

All fishermen already at sea must return immediately.

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SUMMARY: WHAT TO EXPECT

✔ Intensifying Cyclonic Storm Ditwah will drive the weather for the next 3 days.
✔ South India (TN, AP, Rayalaseema) faces highest rainfall threat.
✔ Marine conditions will be extremely hazardous.
✔ Gale winds may cause infrastructure damage in coastal belts.
✔ Fog and cold wave patterns will resume in North India after system passes.

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