Explained: How Cyclone Gulab transforms into another Cyclone Shaheen in the Arabian Sea


Days after heavy rains in Calcutta, a depression began to take shape off the coast of Odisha in the western central Bay of Bengal. Within a few days, the low pressure area intensified into cyclone Gulab, which hit land in neighboring Andhra Pradesh earlier this week. The cyclone movement has now calmed down and is now somewhere over Telangana and adjacent areas of the Marathwada and Vidarbha regions. In a rare phenomenon, the weather system is predicted to intensify again once it reaches the Arabian Sea and turns into Cyclone Shaheen.

The Indian Meteorological Office said the likelihood of a depression forming over the Arabian Sea in the next four to five days was very high. It is the remains of cyclone Gulab that are likely to lead to heavy to very heavy rains in parts of Gujarat in the next two days from Tuesday.

Dr. Manorma Mohanty, a scientist from the Regional Meteorological Center in Ahmedabad, told IndiaToday.in: “We expect very heavy rains over Navsari, Valsad and neighboring counties [of Gujarat]. We expect similar conditions on the first day in Saurashtra and on the second day we expect heavy rains in Rajkot, Navsari, Valsad, on the third day it will decrease and there will be little rainfall. “

The department reckons with a wind speed of 30-40 kilometers per hour up to 60 kilometers per hour.

Visakhapatnam: People wade through a flooded area after heavy rains caused by cyclone Gulab in Visakhapatnam. (PTI photo)


The remains of cyclone Gulab – currently a depression – are located over Vidharba and are likely to emerge and intensify over the northeastern Arabian Sea, hitting land by September 30th. One of the main reasons the remains of the cyclone were generating energy is the availability of moisture in the air as it flows across the land through Telangana.

“The moment it approaches an ocean, it begins to recover energy from moisture, and there is always a chance that it will reappear [as a cyclone]”Said Dr. GK Das, Director of the Regional Meteorological Center, Kolkata. As the monsoon retreat is delayed this year, the moisture content is high, which provides the cyclone with energy.

“The remnant of cyclone” Gulab “will likely be around 30, according to its latest bulletin on Tuesday.

Visakhapatnam: Villagers wade through Cyclone Gulab in Visakhapatnam through a flood-affected area after heavy rainfall. (PTI photo)


Recompression from cyclones is not a common phenomenon. However, it has been observed in India in recent years. The most notable case is Cyclone Gaja, which developed in the Bay of Bengal in November 2018 and moved towards the coast of Tamil Nadu and recovered energy when it surfaced over the central coast of Kerala.

“In the past few years we have seen cyclones from the Bay of Bengal penetrate the Arabian Sea and intensify again, but they usually move to Andhra Pradesh and towards Tamil Nadu and then emerge into the Arabian Sea,” said Dr GK That. The current system tracks a lot over land and then moves into the Arabian Sea.

“A common reason for this is the climate change scenario, be it on the west coast or on the east coast. It also depends on other factors like colder and hotter sea air, â€said Dr. GK Das, director. There are currently warm conditions over parts of the Arabian Sea, which will help turn the remains of cyclone Gulab into yet another cyclone.

Thane: A flooded town after heavy rains due to the influence of cyclone Gulab in Mumbra in Thane. (PTI photo)

The IMD said in its latest bulletin that the sea surface temperature over the northeast and east-central Arabian Seas is around 28-29 degrees Celsius, with a decreasing trend towards the west.


One of the main reasons for the formation of these low pressure areas and depressions is the increasing number of typhoon formations in the western Pacific, which lead to changes in the Bay of Bengal and the Arabian Sea.

“That depends on the frequency of the typhoon in that region and whether or not there are western components to the formation of depression in the Bay of Bengal,” said Dr. GK Das, who added that India has a biannual cyclone season between March and May and has October to December.

Meanwhile, a new depression formed on Tuesday over the northwestern Gulf of Bengal and the adjoining coastal areas of West Bengal that is likely to be more pronounced over the next 24 hours.


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