Cyclone Nargis storm status. By late on 29 April, convection had begun to rebuild, though immediate restrengthening was prevented by increased wind shear. On 1 May 2008, after turning nearly due eastward, Cyclone Nargis began rapidly intensifying, due to greatly improved outflow aided by an approaching upper-level trough. Strengthening continued as Nargis developed a well-defined eye with a diameter of 19 km (12 mi), and early on 2 May, the JTWC estimated that the cyclone reached peak 1-minute winds of 215 km/h (135 mph), as it approached the coast of Myanmar, making it a Category 4 storm. At the same time, the
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