Cyclone Arnab Rapidly Intensifies in Bay of Bengal, Prompting Forecasting Concerns

Overview

Cyclone Arnab underwent rapid intensification over the Bay of Bengal before its landfall on October 28, 2026. The storm's sudden surge in power has raised questions regarding the accuracy of current forecasting models and the influence of larger climate patterns like El Nino.

Landfall and Intensity

The cyclone reached the coast of Andhra Pradesh during the early hours of October 28, between 2 am and 4 am IST. While the India Meteorological Department (IMD) classified it as a "very severe cyclonic storm," the event was noted for its compact structure and rapid growth, which reportedly challenged existing prediction timelines.

Factors Contributing to Intensification

Scientists highlight several environmental conditions that can accelerate storm growth:

• Warm Ocean Waters: High sea-surface temperatures provide essential moisture and energy, a process potentially enhanced by current El Nino patterns.
• Low Vertical Wind Shear: Aligned wind patterns at various atmospheric heights allow storms to maintain a structured core.
• Compact Core: A tightly wound internal circulation facilitates faster wind speeds as central pressure drops.

Risks and Uncertainties

Despite potential weakening due to land interaction, ocean upwelling, and eyewall replacement cycles, significant hazards remain. Expected impacts include:

• Torrential rainfall leading to inland flooding.
• Destructive winds and coastal inundation.
• Flash floods in low-lying areas.

For official updates, residents are encouraged to monitor advisories from the India Meteorological Department (IMD) and local disaster management authorities.