The years between 1940 and 1949 featured the 1940s North Indian Ocean cyclone seasons. Each season was an ongoing event in the annual cycle of tropical cyclone formation. The North Indian tropical cyclone season has no bounds, but they tend to form between April and December, peaks in May and November. These dates conventionally delimit the period of each year when most tropical cyclones form in the northern Indian Ocean. Below are the most significant cyclones in the time period. Because much of the North Indian coastline is near sea level and prone to flooding, these cyclones can easily kill many with storm surge and flooding. These cyclones are among the deadliest on earth in terms of numbers killed. On 27 April 1949, India Meteorological Department (IMD) became a member of the World Meteorological Organization after independence.
1940 season
May 17–25, 1940 – A severe cyclonic storm existed over the Bay of Bengal. June 23–27, 1940 – A cyclonic storm existed over the Bay of Bengal. June 29 – July 5, 1940 – A severe cyclonic storm existed over the Bay of Bengal. July 6–11, 1940 – A severe cyclonic storm existed over the Bay of Bengal. August 1–11, 1940 – A cyclonic storm existed over the Bay of Bengal. August 11–16, 1940 – A depression existed over the Bay of Bengal. August 18–26, 1940 – A depression existed over the Bay of Bengal. August 26 – September 1, 1940 – A depression existed over the Bay of Bengal. September 14–24, 1940 – A depression existed over the Bay of Bengal. September 17–21, 1940 – A depression existed over the Bay of Bengal. October 9–20, 1940 – A severe cyclonic storm existed over the Arabian Sea. October 19–22, 1940 – A severe cyclonic storm existed over the Bay of Bengal. November 3–13, 1940 – A severe cyclonic storm existed over the Arabian Sea. November 11–18, 1940 – A depression existed over the Bay of Bengal and the Arabian Sea. November 14–24, 1940 – A cyclonic storm existed over the Bay of Bengal. December 19–30, 1940 – A depression existed over the Bay of Bengal.
November 1940 Mumbai Cyclone
In November 1940, A Severe Cyclone Struck Mumbai, Gusts reached 121 km/h in Colaba, There were bodies floating in floodwaters, The Cyclone cost the city 25 Lakh Rupees
1941 season
May 21–27, 1941 – A severe cyclonic storm existed in the Bay of Bengal and struck East Bengal (Present day Bangladesh) , causing 7,000 deaths. May 24 – June 1, 1941 – A severe cyclonic storm existed in the Arabian Sea and the Bay of Bengal. June 14–18, 1941 – A depression existed in the Bay of Bengal. June 23 – July 8, 1941 – A depression existed in the Bay of Bengal. July 6–13, 1941 – A severe cyclonic storm existed in the Bay of Bengal. July 8 – August 1, 1941 – A depression existed in the Bay of Bengal. August 7–14, 1941 – A cyclonic storm existed in the Bay of Bengal. August 15–22, 1941 – A cyclonic storm existed in the Bay of Bengal. September 6–13, 1941 – A depression existed in the Bay of Bengal. September 12–20, 1941 – A depression existed in the Bay of Bengal. October 3–5, 1941 – A depression existed in the Arabian Sea. October 4–12, 1941 – A depression existed in the Bay of Bengal. November 14–19, 1941 – A depression existed in the Bay of Bengal. November 29 – December 6, 1941 – A severe cyclonic storm existed in the Bay of Bengal. December 8–15, 1941 – A cyclonic storm existed in the Bay of Bengal.
1942 season
February 18–21, 1942 – A Deep Depression existed over the Gulf of Oman and the Arabian Sea. April 24–28, 1942 – A depression existed in the Gulf of Mannar and moved into the Arabian Sea. June 3–5, 1942 – A cyclonic storm existed over the Bay of Bengal. July 8–13, 1942 – A cyclonic storm existed over the Bay of Bengal. July 17–19, 1942 – A land depression existed over the Chota Nagpur Plateau. July 23–29, 1942 – A depression existed over the Bay of Bengal. July 27–31, 1942 – A depression existed over the Bay of Bengal. July 31 – August 6, 1942 – A deep depression existed over the Bay of Bengal. August 30 – September 8, 1942 – A depression existed over the Bay of Bengal. September 9–12, 1942 – A depression existed over the Bay of Bengal. September 19–23, 1942 – A land depression existed over Bengal. September 26–30, 1942 – A depression existed over the Bay of Bengal. October 11–13, 1942 – A depression existed over the Arabian Sea. October 14–18, 1942 – A severe cyclonic storm existed over the Bay of Bengal. It hit near the West Bengal/Odisha border, resulting in around 61,000 fatalities. A wind speed of 225 km/h (140 mph) was recorded. November 13–17, 1942 – A severe cyclonic storm existed over the Bay of Bengal.