Cyclone Mocha

On 2 May, the India Meteorological Department (IMD) began monitoring the potential for tropical cyclone development in the Bay of Bengal. This potential was boosted by the approach of the active phase of the Madden–Julian oscillation, which likewise aided the formation of Cyclone Fabien in the Southern Hemisphere. By 7 May, converging winds were becoming increasingly conducive for the development of a low-pressure area. The following day, both the Joint Typhoon Warning Center (JTWC) and IMD assessed the formation of a weak low-level circulation developed, which was marked as Invest 91B by the former. On 9 May, the IMD upgraded the system to a depression as very intense atmospheric convection consolidated near the center. The JTWC issued a Tropical Cyclone Formation Alert on the system. On 10 May, the IMD upgraded the depression to a deep depression, and subsequently to a cyclonic storm on 11 May. It received the name Mocha. As fragmented rainbands wrapped into the center and thunderstorms continued to burst over the center, the JTWC followed suit in upgrading the system to Tropical Cyclone 01B. on 13 May.|thumb|223x223px Located on the periphery of an established upper-level ridge, Mocha curved toward the north over the Bay of Bengal while steadily organizing. At 12:00 UTC on 11 May, the IMD upgraded the system to a severe cyclonic storm with winds of as it developed an intense central dense overcast. With time, a ragged eye structure formed and occasionally appeared on satellite imagery. On 12 May, Mocha became a very severe cyclonic storm as an elongated eye became more readily defined. Around this time, Mocha reached 1-minute sustained winds of according to the JTWC, equivalent to Category 2 strength on the Saffir–Simpson hurricane wind scale (SSHWS). While attaining this intensity, the cyclone turned north-northeastward under the influence of an anticyclonic circulation south of Myanmar and a nearby trough. High ocean heat content over the Bay of Bengal fueled a period of rapid intensification, bringing Mocha to extremely severe cyclonic storm status at 18:00 UTC on 12 May. However, this phase was soon interrupted by the onset of an eyewall replacement cycle. After completing its cycle on 13 May, the eyewall became well-defined, resulting in another period of rapid intensification. Low vertical wind shear and robust outflow facilitated the strengthening, and Mocha reached 1-minute sustained winds of , equivalent to Category 4 strength on the SSHWS. Mocha achieved its peak intensity at 18:00 UTC, when the IMD estimated winds of , just under super cyclonic storm intensity. Its barometric pressure was assessed at . The JTWC initially estimated 1-minute sustained winds of at 00:00 UTC of 14 May, making Mocha a Category 5-equivalent tropical cyclone. However, the agency subsequently revised the estimate to . Mocha was a large storm and had a symmetrical eye about wide. Mocha made landfall at 07:00 UTC just north of Sittwe, Myanmar, with 3-minute sustained winds of . The JTWC issued its final bulletin on the storm upon landfall and estimated 1-minute sustained winds of . The vorticity in the atmosphere, poleward outflow, and convergence would still maintain Mocha's intensity as a cyclonic storm throughout its deterioration. On 15 May, Mocha weakened into a depression at 00:00 UTC as it tracked east-northeastward. The depression was later marked as a low-pressure area by the IMD at 03:00 UTC, as its center was not well-defined, prompting the discontinuation of advisories on Mocha. ==Effects==

Myanmar Preparations Local authorities in Rakhine advised residents to evacuate low-lying and coastal areas in Sittwe, Pauktaw, Myebon, Maungdaw, and Buthidaung, and many were already beginning to leave as the storm approached. Communities and aid agencies in Myanmar were preparing for Cyclone Mocha's arrival. The Myanmar Red Cross Society prepared for a major emergency response with the support of the International Federation of Red Cross and Red Crescent Societies (IFRC). More than 78,250 people evacuated from at-risk areas, including 18,800 internally displaced persons in Rakhine. The nation's government preparations for shelter stockpiled to accommodate 100,000 people. Large-scale search and rescue teams were placed on standby, consisting of 3,207 personnel equipped with 1,009 land and 242 water vehicles. Dozens of medical personnel and rapid response teams were deployed to Rakhine and Chin. Non-food items for more than 10,000 people were readied. According to ASEAN, Myanmar's government was better-equipped to handle disasters since Cyclone Nargis in 2008. The World Food Programme (WFP) in Myanmar said it was preparing food and relief supplies to support over 400,000 people in Rakhine and nearby areas. According to the United Nations Office for the Coordination of Humanitarian Affairs (OCHA), Mocha was anticipated to reach Myanmar's Rakhine state and northwest region, where six million people require humanitarian assistance and 1.2 million are displaced. The World Health Organization has positioned 500,000 water purification pills in Myanmar, along with additional supplies. The ASEAN Coordinating Centre for Humanitarian Assistance (AHA Centre) warned of the possibility of a "catastrophic disaster" and stated that it was coordinating with Myanmar's military to fly essential supplies from warehouses in Thailand and Malaysia. State TV reported that the military government was prepared to send food, medicine, and medical personnel. Impact According to media reports, at least 460 people were killed and hundreds of others were left missing, State media and local officials said at least 145 people died across the country. Over 700 people were also injured. As of 18 May, at least 183,042 houses, 1,770 religious buildings, 1,397 schools, 227 medical facilities, 2 airports and 340 government buildings were destroyed across the country. According to World Bank, Mocha directly caused $2.24 billion of damages in Myanmar, equivalent to 3.4% of the country's GDP in 2021. The majority of the deaths occurred in Rakhine state. One woman also died in the Salin Creek on 14 May. Several villages from Sittwe, Mrauk-U, Kyauktaw and Minbya Townships of the state were demolished. In Kyawtaw, nearly 90 percent of houses in the town were destroyed. On Munaung Island, two women died and 1,000 houses were destroyed, including 400 in Pyaeng Taung village. In Chin State, at least 1,136 houses were destroyed in seven townships. A storm surge estimated at impacted coastal communities in Rakhine. Parts of Sittwe were flooded by the surge, leaving streets and homes submerged. Severe winds knocked down a communication tower in Sittwe. Officials from the United League of Arakan estimated the damage in Rakhine state were at US$1.5 billion. In terms of flooding, a satellite estimate released on 16 May determined at least of land was inundated, exposing over 141,000 people. This was in a survey of around . Following Cyclone Mocha's arrival, up to 16 million people (5.6 million being children) were potentially exposed to the storm's affects, including 1.2 million displaced. Residents in the affected area told Reuters that up to 100 Rohingya people may have been killed, although the news agency could not verify the fatality count. News site Myanmar Now said hundreds were missing and "feared dead". The UN High Commissioner for Refugees said refugees died from drowning at camps and additional people were missing. Bangladesh UNHCR, the UN refugee agency, stated that "emergency preparations in the camps and on Bhasan Char are underway" in collaboration with the government and local humanitarian organizations. Heavy rains from the cyclone might cause landslides in Chittagong and Cox's Bazar, as well as three other hilly districts: Rangamati, Bandarban, and Khagrachhari, according to authorities in Bangladesh. A half-million people are being evacuated to safer areas in south-eastern Bangladesh ahead of a possibly catastrophic cyclone. The WHO deployed 40 ambulances and 33 mobile medical teams in Cox's Bazar. In addition, Arjun Jain, the UN's principal coordinator for the Rohingya refugee response in Bangladesh, says that there are numerous ambulances and mobile health teams available to support Bangladeshis in need as well as refugees. These teams are highly trained to assist the elderly, children, and the disabled. The authorities suspended inland river transport in Bangladesh on 13 May and flight operations at Shah Amanat International Airport on 14 May. The Bangladesh government launched a large evacuation campaign to relocate almost 500,000 residents along the country's southern coastlines. By 14 May, approximately 1.27 million people evacuated from Cox's Bazar and over 100,000 from Chittagong. At least 2,522 houses in Cox's Bazar were destroyed, with another 10,469 others damaged. On St. Martin's Island, 700 houses were destroyed 500 houses were destroyed in Teknaf. There and in other upazilas, between 50 and 60 houses were damaged. Mocha's Gale-force winds began to blow in Bangladesh, accompanied by heavy rainfall. Heavy rains in Bangladesh, according to officials, caused damage in several regions. Sri Lanka Although the impact of the cyclone on Sri Lanka was significantly reduced by its landfall between Bangladesh and Myanmar, seven people were injured, another seven were reported missing, and nearly 2,000 people have been affected in Southern Sri Lanka due to the cyclonic storm's indirect influence. The Sri Lanka Navy (SLN) has deployed approximately 30 relief teams to assist those affected by potential floods. India The India Meteorological Department (IMD) said that the southeast Bay of Bengal region of Tripura, Mizoram, Nagaland, southern Assam, and portions of Manipur were expected to receive "heavy" to "very heavy" rainfall as a result of Cyclone Mocha. The state governments of Tripura, Mizoram, Nagaland, Manipur, and Assam also requested that the disaster management and all other relevant authorities take preventative measures to minimize casualties and property damage. The state of Mizoram, at least 154 houses were destroyed or severely damaged and 82 others and eight refugee camps were partially damaged. A total of 5,749 people in more than 50 villages were affected by Mocha. The city of Kolkata experienced intense rainfall. China The National Meteorological Centre (NMC) of the China Meteorological Administration (CMA) said that due to there was a risk of flash flooding, mudslides and landslides in the southwestern provinces of Yunnan and Tibet especially in the Hengduan and Eastern Himalayan Mountain ranges. In response, the State Flood Control and Drought Relief headquarters activated a Level IV response, the lowest level of response to flooding. In China, blizzards were reported in the northwestern part of Yunnan, arising from the collision of moist air from Mocha's remnants with cold wintery air. Due to the presence of cold air and plenty of moisture from Mocha, snow was able to accumulate, covering roads and other structures. ==Aftermath==

Myanmar The state of Rakhine was declared a natural disaster area by military officials. Communications were cut off from Sittwe. Min Aung Hlaing, Myanmar's junta leader, visited Sittwe to assess the damage and provide donations to residents. Storm damage to communications and road infrastructure, as well as ongoing limitations imposed by Myanmar's military government, made it difficult to obtain information and send help to the affected area, according to non-governmental organizations. The United Nations said that 16 million people were affected by the storm, of which according to UNOCHA, 5.1 million of them live in northwestern Rakhine State. Malteser International pledged €100,000 and distributed relief goods on 15 May for those affected. The United States provided $250,000 to Bangladesh and Rohingya refugees on 17 May. India launched operation Karuna to support Myanmar. On 23 May, a supplemental US$122 million Flash Appeal was launched by UNOCHA targeting the needs of 500,000 storm victims. This supplemented an existing humanitarian response plan with a target of 1.1 million people and cost of US$212 million. By mid-June, UN-led humanitarian efforts provided over 110,000 people with shelter and more than 300,000 with food. On 12 June, Myanmar's State Administration Council suspended UN humanitarian aid. ==See also==