2008 North Indian Ocean cyclone season Intertropical Convergence Zone became very active over the Bay of Bengal and later spawned a low-pressure area on April 26. Accompanied by low wind shear, favorable outflow, and over an area of high sea surface temperatures, the system consolidated into a depression the following day. Tracking slowly westward, the depression intensified, becoming Cyclonic Storm Nargis on April 28. That day, steering currents weakened, causing the system to become nearly stationary before a trough influenced more northeasterly, and later easterly, movement. On April 29, the system attained hurricane-force winds. Hours before striking southern Myanmar on May 2, Nargis attained its peak
Cyclone Nargis while it was located about 550 km (340 mi) east of Chennai, India. On 28 April, Nargis became nearly stationary, while situated between high-pressure ridges to its northwest and southeast. That same day, the JTWC upgraded the storm to cyclone status, the equivalent of a minimal Category 1 hurricane on the Saffir-Simpson hurricane scale. Around the same time, the IMD upgraded Nargis to a severe cyclonic storm. The cyclone developed a concentric eye feature, which is an eyewall outside the inner dominant eyewall, with warm waters aiding in further intensification. Early on 29 April, the JTWC estimated Nargis reached winds