12:00 UTC (5:30 p.m. IST) – The IMD reports that Depression BOB 01 has intensified into a deep depression.[1]
28 April
00:00 UTC (5:30 a.m. IST) – The IMD reports that Deep Depression BOB 01 has intensified into a cyclonic storm and
names it "Nargis".[1]
09:00 UTC (2:30 p.m. IST) – The IMD reports that Cyclonic Storm Nargis has intensified into a severe cyclonic storm.[1]
29 April
03:00 UTC (8:30 a.m. IST) – The IMD reports that Severe Cyclonic Storm Nargis has intensified into a very severe cyclonic storm.[1]
May
2 May
03:00 UTC (8:30 a.m. IST) – The IMD reports that Very Severe Cyclonic Storm Nargis has intensified into an extremely severe cyclonic storm. Simultaneously they report that it has reached its peak intensity with 3-minute sustained wind speeds of 165 km/h (105 mph).[1]
12:00 – 14:00 UTC (5:30 – 7:30 p.m. IST) – Extremely Severe Cyclonic Storm Nargis makes landfall on the southwest coast of
Myanmar at peak intensity with 3-minute sustained wind speeds of 165 km/h (105 mph).[1]
18:00 UTC (11:30 p.m. IST) – The IMD reports that Extremely Severe Cyclonic Storm Nargis has weakened into a very severe cyclonic storm.[1]
21:00 UTC (2:30 a.m. IST, 3 May) – The IMD reports that Very Severe Cyclonic Storm Nargis has weakened into a severe cyclonic storm.[1]
3 May
06:00 UTC (11:30 a.m. IST) – The IMD reports that Severe Cyclonic Storm Nargis has weakened into a cyclonic storm.[1]
12:00 UTC (5:30 p.m. IST) – The IMD reports that Cyclonic Storm Nargis has degenerated into an area of low pressure while located over eastern Myanmar.[1]
June
5 June
00:00 UTC (5:30 a.m. IST) – The IMD reports that Depression ARB 01 has formed roughly 500 km (310 mi) 15.5N, 66.0E. Simultaneously, they report that the system has reached its peak intensity with 3-minute sustained wind speeds of 45 km/h (30 mph).[1]
6 June
21:00 UTC (2:30 a.m. IST, 7 June) – The IMD reports that Depression ARB 01 has dissipated while located roughly 500 km (310 mi) 20N, 61E.[1]