Cyclone Vayu Explained

Very Severe Cyclonic Storm Vayu
Formed:10 June 2019
Remnant:17 June 2019
Dissipated:18 June 2019
Winds:80
Pressure:970
Winds:100
Pressure:948
Year:2019
Fatalities:8 total
Damage:140000
Areas:Maldives, India, Pakistan, Oman
Season:2019 North Indian Ocean cyclone season

Very Severe Cyclonic Storm Vayu was a strong tropical cyclone that caused moderate damage in India during June 2019. It was the strongest tropical cyclone to affect the Saurashtra Peninsula of northwestern India since the 1998 Gujarat cyclone.[1] Vayu was the third tropical depression, third cyclonic storm and second very severe cyclonic storm of the 2019 North Indian Ocean cyclone season, and the first of which to form in the Arabian Sea. Vayu originated from a low-pressure area that was first noted by the India Meteorological Department (IMD) on 9 June, near the northern Maldives. After consolidating into a depression, the storm tracked slowly north-northwestward over the eastern Arabian Sea, and reached cyclonic storm intensity late on 10 June. Steady strengthening continued into 11 June, and the storm underwent rapid intensification late in the day. Vayu reached peak intensity as a high-end very severe cyclonic storm at 06:00 UTC on 12 June, with three-minute sustained winds of 150abbr=onNaNabbr=on and a minimum pressure of 970 hPa (28.64 inHg).[2] Despite initially being forecast to make landfall in the state of Gujarat, Vayu turned abruptly to the west on 13 June and moved away from the coast. The system weakened gradually as it tracked slowly towards the Arabian Peninsula, then weakened more quickly after beginning to accelerate back towards India on 16 June. Vayu was downgraded to a deep depression the following morning, and further to a depression a few hours later. The system degenerated into a well-marked low-pressure area late on 17 June, just before crossing the Gujarat coast. Vayu's remnants continued inland for several more hours, before dissipating on 18 June.

In total, as many as 6.6 million people in northwestern India were impacted by the cyclone.[3] Approximately 300,000 residents of coastal Gujarat were evacuated on 12 June in preparation for the system's arrival, and thousands of personnel were deployed to the region to assist with preparations, rescue operations and clean up efforts. As of 18 June, eight people are reported to have been killed either directly or indirectly by the cyclone, and at least 12 more injured.[4] [5] [6] [7] [8]

The name Vayu was provided by India, and is derived from a Sanskrit and Hindi word meaning 'wind'.[9]

Meteorological history

In early June, a strong pulse of the Madden–Julian oscillation (MJO) tracked eastwards into the tropical Indian Ocean, leading to increased cloudiness and rainfall across the region.[10] The presence of the pulse also contributed to enhanced convective activity, and generated conditions which were supportive of tropical cyclogenesis.[11] On 9 June, the India Meteorological Department (IMD) noted the development of a low-pressure area over the southeastern Arabian Sea, to the north of the Maldives.[12] Organisation increased throughout the day, and owing to the improved structure of the system, the United States' Joint Typhoon Warning Center (JTWC) issued a Tropical Cyclone Formation Alert at 22:30 UTC.[13] At 00:00 UTC the following day, the IMD indicated that the low-pressure area had consolidated into a tropical depression, and assigned it the designation ARB 01.[14] Conditions were favourable for further intensification, with improving upper-level divergence, and ample energy being provided by extremely warm sea surface temperatures of 31 °C (88 °F).[15] Vertical wind shear also continued to decrease as the depression tracked steadily north-northwestwards parallel to the western coast of India under the influence of an anticyclone over central India.[16] Deep convection strengthened around the low-level circulation centre, and the system was upgraded to a deep depression at 06:00 UTC.[17] Six hours later, the JTWC assessed one-minute sustained winds as having reached 65abbr=onNaNabbr=on, and designated the system as Tropical Cyclone 02A.[18] At 18:00 UTC on 10 June, the system strengthened into the third cyclonic storm of the season, and was named Vayu by the IMD.[19]

Vayu continued to steadily strengthen after intensifying into a cyclonic storm. A formative eye began to develop on 11 June, as intense deep convection wrapped tightly around the system. Vayu became a severe cyclonic storm by 12:00 UTC, and reached Category 1 tropical cyclone status on the Saffir–Simpson hurricane wind scale (SSHWS).[20] Shortly afterwards, the cyclone began a period of rapid intensification; however, the rate of intensification was tempered somewhat by strong vertical wind shear. Vayu was upgraded to a very severe cyclonic storm at 18:00 UTC, and continued to strengthen through 00:00 UTC on 12 June, at which point the system became a Category 2-equivalent tropical cyclone on the SSHWS.[21] One-minute sustained winds increased to 165abbr=onNaNabbr=on six hours later as a ragged eye developed on visible-light satellite imagery, surrounded by strong deep convection, particularly in the western semicircle of the storm.[22] The intensification trend then slowed, however, with three-minute sustained winds only increasing further to 150abbr=onNaNabbr=on by 12:00 UTC.[23] Vayu's intensity soon plateaued as ocean heat content began to decrease and drier air began to infiltrate the cyclone's circulation.[24] [25] As Vayu approached the coastline of the state of Gujarat in northwestern India, the influence of a strengthening subtropical ridge over Saudi Arabia caused the system to gradually slow down and turn towards the west.[26] [27] At 12:00 UTC on 13 June, the JTWC indicated that lower vertical wind shear had allowed Vayu to strengthen, noting that the eye had become more distinct. Vayu's intensity was now equivalent to a minimal Category 3 major hurricane on the SSHWS, with one-minute sustained winds of 185abbr=onNaNabbr=on.[28]

Vayu began to weaken on 14 June as it tracked slowly westward, away from the Gujarat coastline.[29] Despite the low wind shear and warm ocean, upper-level outflow from the storm had begun to diminish, allowing the dry air entrainment from the northwest to start eroding the cyclone.[30] The central dense overcast and circulation centre became increasingly ragged and elongated as deep convection diminished and started to become displaced. Vayu weakened to Category 1-equivalent tropical cyclone status at 12:00 UTC,[31] as the loose central convection expanded to leave a ragged eye 55 km (35 mi) in diameter.[32] Vayu's slow westward track through the weak competing steering environment over the northern Arabian Sea brought the system into an environment of high easterly vertical wind shear.[33] The majority of deep convection became confined to the cyclone's southern quadrants, causing the system to weaken to a severe cyclonic storm at 00:00 UTC on 16 June.[34] An approaching mid-latitude trough weakened the areas of high pressure centred to the west and northeast, Vayu recurved sharply to the northeast.[35] Upon weakening further to a cyclonic storm, strong low-level southwesterly flow caused the system to accelerate northeastwards through the break in the blocking high-pressure ridge, back towards the Gujarat coast.[36] Strong vertical wind shear and dry air ingestion from the western semicircle of the storm's circulation continued to erode the cyclone, and Vayu weakened into a deep depression at 03:00 UTC on 17 June,[37] with the JTWC issuing their final advisory at this time.[38] The system was downgraded further to a depression by the IMD six hours later.[39] Soon afterwards, the IMD issued their final advisory on the system after Vayu degenerated into a well-marked low-pressure area, just before crossing the Gujarat coast near the India–Pakistan border.[40] On 18 June, Vayu's remnants slowly moved inland, while continuing to weaken, before dissipating later that day.

Preparations

First approach to land

As the system intensified into a deep depression, the IMD issued a pre-cyclone watch for the coastline of the state of Gujarat. The agency indicated that further strengthening into a cyclonic storm within the following 24 hours was very likely. Fishermen were warned not to venture into the Arabian Sea near the developing system or in the forecast path of the cyclone, and mariners already at sea were urged to return to the coast.[41] The pre-watch for the Gujarat coastline was upgraded to a yellow cyclone alert at 12:00 UTC on 10 June, with forecasts predicting landfall as a very severe cyclonic storm on 12 June. This was further upgraded to an orange alert on 11 June.[42] The IMD warned that thatched houses in the path of the cyclone were likely to be completely destroyed, and that kutcha houses could sustain significant damage. The IMD also indicated that a storm surge of 1.5–2.0 m (4.9–6.6 ft) was possible, and had the potential to inundate low-lying coastal areas.[43]

Tropical cyclones are relatively infrequent in northwestern India and the northern Arabian Sea. Gujarat had not experienced a hurricane-force tropical cyclone landfall since an unnamed system struck the region as an extremely severe cyclonic storm in June 1998, causing more than 10,000 fatalities.[44] As Vayu was initially forecast to make landfall as a very severe cyclonic storm, the potential for major impacts prompted significant preparation measures in the state. Beginning on the morning of 12 June, the Indian government evacuated approximately 300,000 people living in coastal regions of Gujarat to 2000 shelter homes,[45] [46] as well as 10,000 people from the nearby island of Diu.[47] All schools and colleges in the area were also closed to safeguard students and staff. All flights at airports in Porbandar, Diu, Bhavnagar, Keshod and Kandla were grounded from midnight local time on 13 June, and 77 train services cancelled and 38 others shortened. In Mumbai, ferry services were suspended, more than 128 train services were cancelled or shortened,[8] and approximately 400 flights were affected by delays or diversions as the cyclone passed to the west on 12–13 June. All ports in Gujarat suspended operations from 12 June, and many vessels which had been berthed there departed the ports for safety.[48]

Approximately 2,300 personnel in 52 teams from the National Disaster Response Force were deployed to Gujarat help local authorities with evacuation efforts, as well as to aid in search, rescue and relief operations after the cyclone. Personnel from the state reserve police were deployed to the region, as well as 300 commandos from the state marine police. Boats and aircraft were sent to various locations across Gujarat to enable and assist search and rescue operations if required.[49] The Indian Coast Guard, Army, Navy and Air Force were also all put on alert, with about 2,400 army personnel in 34 teams placed on standby, and naval diving teams assembled to conduct water rescues if necessary.[50] Police officers also conducted night patrols to ensure that no residents were left behind in evacuated areas.

Second approach to land

After local governments were informed that Cyclone Vayu was likely to return to the coast of Gujarat, further preparations were undertaken, albeit minor due to the significantly weakened nature of the system. The IMD warned that heavy rainfall and large waves were expected, and had the potential to inundate low-lying areas such as the coastal salt marshes. As a precaution, the local government in the Kutch district of northern Gujarat asked salt pan workers in coastal areas from Bhachau to Mundra to stay home from work. The government noted that five teams from the NDRF that had been deployed in the initial large-scale preparatory measures would remain in Kutch for the anticipated landfall, and that several teams of local officers had been formed to help maintain safety and security throughout the event. Plans were made to evacuate local residents at short notice if required.[51]

Impacts

Despite not making landfall, Cyclone Vayu tracked close enough to the Indian coastline to produce minor impacts. Strong winds, heavy rainfall and large waves were experienced along large sections of the country's western coast, particularly in Gujarat.[52] Numerous thatched houses were either damaged or destroyed by gusty winds, with many kutcha houses having their roofs torn off. A large number of tin sheds were blown away, and many trees were uprooted along the Saurashtra coast and on the island of Diu.[53] Strong winds caused the 150-year-old Bhuteshwar Mahadev temple in Porbandar to collapse and a metal shed at Somnath Temple to be damaged.[54] [55] Damage to power lines and electricity poles caused power cuts in more than 2,250 villages in Gujarat, with blackouts lasting for several days in some locations.[56] [57] The prolonged strong winds generated waves of around 4 m (13 ft) high along large parts of the coastline. Many low-lying coastal areas on the Saurashtra coast and southern Gujarat were flooded by waves and tides of up to 6 m (20 ft) in height, and severe damage was caused to at least 15 houses in the city of Ullal.[58] Local fishermen in Porbandar sustained ₹10 million (US$140,000) in damages as strong winds and waves caused as many as 25 small boats to sink, and one larger boat to receive significant damage. In Veraval, about 20 small boats and five larger boats were also damaged. Fishermen complained that there had been inadequate room to safely anchor their vessels during the cyclone, which was responsible for the damage.[59] Some fishermen in Veraval also had to be rescued after their boats capsized in the large waves, with one person being hospitalised due to their injuries.[60]

Moderate to heavy rainfall occurred in more than 100 tehsils across Gujarat. The highest observed rainfall total was at Talala in the Gir-Somnath district, where 160mm of precipitation was recorded.[61] Veraval also experienced heavy rainfall, with 67mm falling in just six hours.[62] In southern Gujarat, lightning strikes killed five people and injured two others. Many of the victims had been working on farms during heavy rain and thunderstorms when they were struck. A motorist was also killed after being hit by a falling tree on the side of the road while driving home. In the town of Chamba in northern India, houses and roads were damaged by flash flooding and hail from a severe thunderstorm associated with Vayu. Rainfall associated with Vayu continued for several days in the state of Maharashtra, with the city of Nashik receiving 92.1mm of precipitation in a 24-hour period on 15–16 June.[63]

Cyclone Vayu also caused impacts in other parts of India. Mumbai experienced strong sustained winds which peaked just below gale-force at 58 km/h (36 mph) after midday on 12 June. Several trees fell throughout the city, resulting in at least four injuries, and blocking a road for many hours. A pedestrian was killed and two others were injured when an aluminium cladding sheet fell from Churchgate railway station. The family of the deceased victim received ₹500,000 (US$7,000) as an ex gratia payment from the railway company.[64] Three pedestrians were injured by an acrylic sheet that had fallen from a skywalk due to strong winds. A hoarding also collapsed near a train station in Thane, although no injuries were reported. Strong winds also produced a large dust storm in the Indian capital, New Delhi, on 12 June.[65] Crude oil and plastic waste were washed up onto beaches on the Raigad, Ratnagiri and Sindhudurg coasts by waves generated by Vayu.[66] [67]

Enhanced waves and ocean swell generated by Cyclone Vayu while it was located in the northern Arabian Sea also affected some coastal areas of Oman, including the South Al Sharqiyah governorate. The waves caused minor flooding of low-lying areas in various towns along the coast, including Al Suwaih and Ras Al Hid. Seawater caused some houses to become flooded, as well as local beaches and surrounding areas. Floodwaters also caused several vehicles to drift from where they were parked.[68] Large waves also caused minor flooding in about ten villages in coastal regions of southern Pakistan.[69]

The onset of the Indian monsoon had been delayed past its usual commencement by about one week due to near-El Niño conditions in the tropical Pacific Ocean throughout 2019.[70] [71] The formation of Cyclone Vayu caused a further week's delay in the monsoon's progression towards northern India by drawing clouds and moisture over the Arabian Sea, away from the developing monsoon trough.[72] The severe heat wave in Pakistan was also exacerbated by Vayu. The anticlockwise rotation of the cyclone's wind field caused typical cool onshore winds to be replaced by hot winds from the desert to the north.[73] Temperatures of above 40C were experienced in numerous cities across the country, including the coastal city of Karachi.[74] One elderly resident in Karachi died of heat stroke on 15 June, and numerous other people were treated in hospitals and medical clinics for symptoms such as dehydration, dizziness and exhaustion.

See also

External links

Notes and References

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  47. News: Cyclone Vayu Highlights: Lakhs Evacuated; Trains And Flights Stopped. Jha. Prionka. 13 June 2019. NDTV. 14 June 2019. https://web.archive.org/web/20190614132112/https://www.ndtv.com/india-news/cyclone-vayu-live-updates-lakhs-evacuated-trains-and-flights-stopped-2052412. 14 June 2019.
  48. News: Cyclone Vayu poised to hit India as year's second major storm. 12 June 2019. Al Jazeera. 12 June 2019.
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  50. News: Cyclone Vayu: India cyclone changes course overnight. 13 June 2019. BBC News. 13 June 2019. https://web.archive.org/web/20190613083259/https://www.bbc.com/news/world-asia-india-48608773. 13 June 2019. British Broadcasting Corporation.
  51. News: Cyclone Vayu to cross north Gujarat by Monday midnight as depression, coastal areas on alert. 16 June 2019. The Indian Express. 17 June 2019. https://web.archive.org/web/20190617041751/https://indianexpress.com/article/weather/cyclone-vayu-to-weaken-before-recurving-towards-gujarat-coast-5783296/. 17 June 2019.
  52. News: Cyclone Vayu veers away from Indian coast. Solanki. Ajit. 13 June 2019. News.com.au. 15 June 2019. https://web.archive.org/web/20190615153307/https://www.news.com.au/world/breaking-news/india-braces-as-cyclone-vayu-approaches/news-story/9e54d26c803157eab0a119a5f61e616d. 15 June 2019.
  53. News: Cyclone spares Guj, changes course to Oman. Dasgupta. Manas. 14 June 2019. The Tribune. 14 June 2019. https://web.archive.org/web/20190614015305/https://www.tribuneindia.com/news/nation/cyclone-spares-guj-changes-course-to-oman/787415.html. 14 June 2019.
  54. News: Cyclone Vayu skirts Gujarat as it moves towards Oman, state to remain on high alert for 24 hours. 13 June 2019. Scroll.in. 13 June 2019. https://web.archive.org/web/20190613170635/https://scroll.in/latest/926946/cyclone-vayu-skirts-gujarat-as-it-moves-towards-oman-state-to-remain-on-high-alert-for-24-hours. 13 June 2019.
  55. News: Cyclone Vayu veers away, but Gujarat still on high alert. 14 June 2019. The Times of India. 14 June 2019.
  56. News: Even though danger of storm VAYU is gone, need to be alert: Gujarat CM. 13 June 2019. United News of India. 13 June 2019. https://web.archive.org/web/20190613172554/http://www.uniindia.com/even-though-danger-of-storm-vayu-is-gone-need-to-be-alert-gujarat-cm/west/news/1631004.html. 13 June 2019.
  57. News: Gale, rough sea leaves several fishing boats damaged. 15 June 2019. The Times of India. 15 June 2019.
  58. News: Heavy rains, tidal waves damage properties in Mangaluru's Ullal. 15 June 2019. ANI. 15 June 2019. https://web.archive.org/web/20190615160628/https://www.newkerala.com/news/read/157970/heavy-rains-tidal-waves-damage-properties-in-mangalurus-ullal.html. 15 June 2019.
  59. News: Fishermen Claim Heavy Losses Due To Cyclone Vayu, Seek Government Help. 14 June 2019. ANI. 15 June 2019. https://web.archive.org/web/20190615155717/https://www.ndtv.com/india-news/gujarat-fishermen-claim-heavy-losses-due-to-cyclone-vayu-seek-government-assistance-2053497. 15 June 2019.
  60. News: Six million people could be affected by Tropical Cyclone Vayu. 13 June 2019. 9News. 13 June 2019. https://web.archive.org/web/20190613101956/https://www.9news.com.au/world/world-news-cyclone-vayu-india-weather-to-pass-dangerously-close-to-gujarat-news-updates/3b59a794-b8e0-4b66-9891-d1ea4fa67e4b. 13 June 2019.
  61. News: Cyclone Vayu: Centre says storm may hit Gujarat's Kutch, IMD contradicts. 15 June 2019. India Today. 15 June 2019. https://web.archive.org/web/20190615153930/https://www.indiatoday.in/india/story/cyclone-vayu-may-not-hit-kutch-will-weaken-after-recurve-1549370-2019-06-15. 15 June 2019.
  62. News: VERAVAL RECORDS 67 MM RAIN IN SIX HOURS AS CYCLONE VAYU SKIRTS THE GUJARAT COAST. 14 June 2019. Skymet Weather. 15 June 2019. https://web.archive.org/web/20190615162308/https://www.skymetweather.com/content/home-page-top-right/veraval-records-67-mm-rain-in-six-hours-as-cyclone-vayu-skirts-the-gujarat-coast/. 15 June 2019.
  63. News: Rain in Pune, Kolhapur, Sangli and Satara to Continue, Despite Cyclone Vayu Moving Away. 16 June 2019. Skymet Weather. 16 June 2019. https://web.archive.org/web/20190616120935/https://www.skymetweather.com/content/weather-news-and-analysis/rain-in-pune-kolhapur-sangli-and-satara-to-continue-despite-cyclone-vayu-moving-away/. 16 June 2019.
  64. News: Man killed as portion of cladding collapses at Churchgate railway station. 12 June 2019. Mumbai Mirror. 16 June 2019. https://web.archive.org/web/20190616084508/https://mumbaimirror.indiatimes.com/mumbai/other/man-killed-as-portion-of-cladding-collapses-at-churchgate-railway-station/articleshow/69757169.cms. 16 June 2019. live.
  65. News: Dust storm in Delhi–NCR, mercury drops; light rain forecast for today. 13 June 2019. Hindustan Times. 13 June 2019. https://web.archive.org/web/20190613101229/https://www.hindustantimes.com/delhi-news/cyclone-vayu-killed-the-afghan-dust-storm-but-triggered-a-local-dust-storm-in-delhi/story-Q5wkHP39eQ44jX6mnpYlJM.html. 13 June 2019.
  66. News: Fishermen raise concern over oil being washed ashore off Raigad and Ratnagiri coast. 14 June 2019. DNA India. 14 June 2019. https://web.archive.org/web/20190614020408/https://www.dnaindia.com/mumbai/report-fishermen-raise-concern-over-oil-being-washed-ashore-off-raigad-and-ratnagiri-coast-2760588. 14 June 2019.
  67. News: Fishermen spot oil, tar tracks on Maha's beaches. 15 June 2019. The Asian Age. 15 June 2019. https://web.archive.org/web/20190615160751/https://www.asianage.com/metros/mumbai/150619/fishermen-spot-oil-tar-tracks-on-mahas-beaches.html. 15 June 2019.
  68. News: Seawater enters homes in South Al Sharqiyah coast. 16 June 2019. The Times of Oman. 17 June 2019. https://web.archive.org/web/20190617042311/https://timesofoman.com/article/1462281. 17 June 2019.
  69. News: Weather in Karachi returns to normalcy as cyclone Vayu subsides. 17 June 2019. ARY News. 17 June 2019. https://web.archive.org/web/20190617140414/https://arynews.tv/en/weather-karachi-cyclone-vayu-subsides/. 17 June 2019.
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  72. News: Monsoon In Maharashtra Likely To Be Delayed By 1 Week Due To Cyclone Vayu. 14 June 2019. ANI News. 14 June 2019. https://web.archive.org/web/20190614103925/https://www.ndtv.com/india-news/cyclone-vayu-monsoons-in-maharashtra-likely-to-be-delayed-by-one-week-2053262. 14 June 2019.
  73. News: Weeks-long heat wave tightening its grip on Pakistan, and it won't let up for weeks. Navarro. Adriana. 14 June 2019. AccuWeather. 15 June 2019. https://web.archive.org/web/20190615155327/https://www.accuweather.com/en/weather-news/weeks-long-heat-wave-tightening-its-grip-on-pakistan-and-it-wont-let-up-for-weeks/70008559. 15 June 2019.
  74. News: Karachi's temperature to soar as Cyclone Vayu nears India. Shahnawaz Ali. S. 13 June 2019. SAMAA TV. 14 June 2019. https://web.archive.org/web/20190614131520/https://www.samaa.tv/environment/2019/06/karachis-temperature-to-soar-as-cyclone-vayu-nears-india/. 14 June 2019. Jaag Broadcasting Systems.

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