Cyclone Bejisa

Intense Tropical Cyclone Bejisa
Intense tropical cyclone (SWIO scale)
Category 4 (Saffir–Simpson scale)

Bejisa near peak intensity on January 2, 2014
Formed December 27, 2013
Dissipated January 4, 2014
Highest winds 10-minute sustained: 175 km/h (110 mph)
1-minute sustained: 215 km/h (130 mph)
Gusts: 240 km/h (150 mph)
Lowest pressure 948 hPa (mbar); 27.99 inHg
Fatalities 1 total
Damage At least $89.2 million (2014 USD)
Areas affected Seychelles, Réunion, Mauritius
Part of the 2013–14 South-West Indian Ocean cyclone season

Cyclone Bejisa was a tropical cyclone that affected the islands of Réunion and Mauritius in early January 2014. In late December 2013, a tropical disturbance developed to the north of Madagascar. With favorable conditions, the low developed into a disturbance and soon into a depression on December 28. The system continued to develop and intensified into Moderate Tropical Storm Bejisa on December 29, with rapid intensification occurring. It developed into an Intense Tropical Cyclone on December 30, reaching peak maximum sustained winds of 165 km/h (105 mph).[nb 1] Due to an eyewall replacement cycle, Bejisa weakened, but re-intensified to a secondary peak of 160 km/h (100 mph) on January 1. Increased wind shear weakened the eyewall, which passed within 15 km (9 mi) of Réunion. After having moved generally south-southeastward for much of its duration, Bejisa turned to the southwest on January 3, by which time it had weakened to tropical storm status. It became a post-tropical cyclone on January 5 after the convection weakened over the center, and Bejisa became extratropical the next day as it meandered southwest of Madagascar.

In its formative stages, Bejisa brought heavy rainfall to Seychelles, and it also dropped rainfall in Mauritius and Madagascar. Effects were worst on Réunion, where wind gusts were around 130–150 km/h (80–90 mph) along the coast. The storm also dropped torrential rainfall, peaking at 800 mm (31 in) at a volcano in Cilaos. The winds and rains downed many trees and power lines, which blocked roads and left 181,000 people without power. About 49% of the island also lost water supply. Bejisa left heavy damage to the agriculture industry, mainly to vanilla and sugar cane, totaling €63 million (US$85.2 million) in losses. The commune of Saint-Paul sustained moderate damage, with losses estimated at €3 million (US$4 million). Bejisa killed one person on the island due to head trauma, and there were 16 injuries. Later, the cyclone produced high waves in South Africa.

Meteorological history

Map of a tropical cyclone's track as denoted by colored dots. The location of each dot indicates the storm's relative position at six-hour intervals, and its color denotes the storm's intensity at that location.
Map plotting the track and intensity of the storm according to the Saffir–Simpson hurricane wind scale

In late December 2013, computer forecast models began to predict the development and cyclogenesis of a disturbance within the monsoon trough north of Madagascar.[1] At 1800 UTC on December 27, the Joint Typhoon Warning Center (JTWC) noted a discrete area of disturbed weather approximately 1,350 km (840 mi) north-northwest of Réunion that corresponded with model forecasts and had the potential to develop.[2] Accompanied by a low-level circulation center, the monitored storm complex developed rainbands about its southern periphery the following day.[3] At 1200 UTC on December 28, Météo-France deemed the system sufficiently organized to be considered a tropical disturbance, the fourth system to be given such a classification by the agency that season.[4] Upon its designation, the disturbance was analyzed to have an unusually high barometric pressure, based on nearby weather station observations.[5] Météo-France projected for the system to peak as a tropical cyclone before slightly weakening and impacting the Mascarene Islands.[6]

Tracking southward, the disturbance steadily organized following December 28. As a result of wind shear, the system's low-level circulation center remained partially exposed, though the shearing conditions were expected to lessen [7] At 0000 UTC on December 29, the disturbance was upgraded to a tropical depression.[8] At 1800 UTC that day, the depression intensified to moderate tropical storm intensity, thus receiving the name Bejisa by the Mauritius Meteorological Services.[9][10] This coincided with the improving satellite appearance of the storm's central dense overcast.[10] Intensification subsequently quickened, and at 0600 UTC the next day Bejisa was considered to be a severe tropical storm.[11] Concurrently a strengthening ridge in the mid-levels of the troposphere began to steer the storm towards the south-southeast.[12] Following the development of a small pinhole eye, Bejisa was upgraded to tropical cyclone status at 1200 UTC on December 30,[13] followed by intense tropical cyclone status six hours thereafter,[14] with peak winds of 165 km/h (105 mph).[15] In addition, the JTWC estimated 1–minute winds of 195 km/h (120 mph), utilizing the Dvorak technique to estimate the intensity. The agency noted that decreasing wind shear, favorable outflow, and warm sea surface temperatures allowed for the intensification. At that time of the peak winds, Bejisa was located about 825 km (515 mi) north-northwest of Réunion.[16]

The intensification phase of Bejisa was short-lived, as an eyewall replacement cycle resulted in a slight deterioration and fluctuation of the storm's organization and structure.[17] On December 31, the system weakened below intense tropical cyclone status as the eye became less organized.[18] When the eyewall replacement cycle completed, the eye became larger and the winds increased.[19] Late on December 31, Bejisa passed about 125 km (75 mi) west of Tromelin Island.[20] On the next day, the cyclone attained a secondary peak intensity of 160 km/h (100 mph).[21] However, increasing wind shear eroded the eyewall,[22] which opened the eyewall in the northern periphery. Despite Météo-France assessing that Bejisa had weakened,[23] at the same time the JTWC estimated that the cyclone had intensified further to reach peak 1–minute winds of 205 km/h (125 mph) on January 2.[24] That day, the storm's center passed within 155 km (95 mi) of Réunion while continuing to the southeast,[25] and the eyewall passed within 15 km (9 mi) of the island.[26] Continued wind shear stripped the convection,[27] coupled with cooler water temperatures, and early on January 3, Bejisa weakened below tropical cyclone status. By that time, the ridge to the southeast turned the storm to the southwest.[28] A slight decrease in wind shear was expected to allow the convection to rebuild on January 4,[29] and the storm strengthened slightly.[30] By January 5, Bejisa began evolving into a post-tropical cyclone, with weaker convection over the center.[31] That day, Météo-France reclassified Bejisa as a post-tropical depression, noting that the radius of maximum winds had expanded.[32] On the same day, the JTWC discontinued warnings after assessing that the storm had become a subtropical cyclone.[33] Increasing wind shear displaced the remaining convection west of the center,[34] and Météo-France discontinued advisories on Bejisa on January 6 after the exposed turned more to the south.[35] The storm became extratropical and turned to the northeast, and was last noted on January 7.[36]

Preparations and impact

JTWC forecast track for Bejisa on January 2

Upon designation as a tropical disturbance, the predecessor to Cyclone Bejisa dropped heavy rainfall across the Seychelles. A weather station on Mahé observed 164 mm (6.46 in) of rain over a 24-hour period beginning on December 27. The Farquhar Group were particularly affected, as the storm's incipient central region of convection remained over the area for an extended period of time.[5]

Before the storm affected Réunion, Bejisa passed west of Tromelin Island, producing winds of 80 km/h (49 mph).[20] The storm also produced heavy rainfall on Mauritius.[37] Rainfall and gusty winds also affected portions of Madagascar.[38] Later, Bejisa produced high waves along the coast of KwaZulu-Natal in South Africa.[39]

Réunion

In advance of the storm striking Réunion, officials advised residents to remain inside. Officials ordered residents in Saint-Leu along the coast to evacuate inland,[40] and at least 300 people evacuated island-wide.[26] The airport at Saint-Denis was closed, but reopened after the storm passed the island;[41] several flights were canceled as a result.[42] The main port was also closed,[26] as were most childcare facilities, and mail service was suspended. Officials issued a red alert for the island, the first since Cyclone Dumile a year prior.[40]

On Réunion, Bejisa produced strong wind gusts, averaging 130–150 km/h (80–90 mph) along the coast, and peaking in Saint-Louis.[43] The winds downed numerous trees and power lines, leaving an estimated 181,000 people without electricity,[44] and closing roads due to debris.[26] All eight of the island's high tension lines were affected.[44] Thirty percent of cell phone service was temporarily lost due to the outages.[43] Torrential rains impacted much of the island, with a 24 hour total of 800 mm (31 in) measured at a volcano in Cilaos and 600 mm (24 in) measured in a nearby town.[45] The rains caused rivers to rise, resulting in flooding.[38] About 49 percent of homes lost their water supply.[41] Tremendous agricultural damage occurred across Réunion, with some areas reporting 80–100 percent losses. Damage in the sector reached €63 million (US$85.2 million) alone,[46] mostly to sugar cane and vanilla.[38] The communne of Saint-Paul sustained moderate damage, with losses estimated at €3 million (US$4 million). Approximately €1 million of this stemmed from wind and water damage to homes; 121 residences qualified for relief aid. Along the coast, a pier was destroyed,[47] several boats were damaged, and roads were impacted.[38] One person died from head trauma while 16 people were injured in various incidents.[45] Two of the injuries were severe due to falling off ladders while attempting to secure their homes during the high winds.[40]

In the wake of Bejisa, Électricité de France (EDF) deployed 500 personnel and 6 helicopters to restore power on the island. Within three days, roughly 160,000 residences were restored, considerably faster than previous restoration efforts in previous cyclones. By January 9, all but a few dozen homes had power.[44] In addition, water supply was largely restored within four days.[38] A state of national disaster was declared for Réunion on January 17, by Overseas Minister of France, Victorin Lurel.[48] This declaration covered 16 towns on the island: Les Avirons, Cilaos, L'Entre-Deux, L'Étang-Salé, Petite-Île, La Plaine-des-Palmistes, Le Port, La Possession, Saint-Joseph, Saint-Leu, Saint-Louis, Saint-Paul, Saint-Pierre, Salazie, Le Tampon, and Trois-Bassins.[49] Insurance estimates indicated that €25 million (US$33.8 million) was needed for relief funding.[48] Farmers were eligible for compensation under the disaster declaration; however, many voiced their skepticism following a lack of follow-through by the government to supply funds after Tropical Cyclone Dumile in January 2013.[46] Ultimately, the affected farmers had to indicate their taxed losses by February 26 to receive the assistance.[50] By April 2014, all farmers affected by the declaration were compensated.[51]

See also

Wikimedia Commons has media related to Cyclone Bejisa.

Notes

  1. ↑ All measurements of maximum sustained wind are measured or estimated over a period of ten minutes unless otherwise noted.

References

  1. ↑ "Bulletin For Cyclonic Activity And Significant Tropical Weather In The Southwest Indian Ocean – December 27, 1200 UTC". Météo-France. December 27, 2013. Archived from the original (PDF) on December 30, 2013. Retrieved 30 December 2013.
  2. ↑ Joint Typhoon Warning Center (December 27, 2013). "Significant Tropical Weather Advisory For The Indian Ocean – December 27, 1830 UTC". Pearl Harbor, Hawaii: United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on December 29, 2013. Retrieved 30 December 2013.
  3. ↑ Joint Typhoon Warning Center (December 28, 2013). "Significant Tropical Weather Advisory For The Indian Ocean– December 28, 1000 UTC". Pearl Harbor, Hawaii: United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on December 29, 2013. Retrieved 30 December 2013.
  4. ↑ Météo-France (December 28, 2013). "Tropical Disturbance 4 Warning Number 001/4". United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on December 29, 2013. Retrieved 30 December 2013.
  5. 1 2 "Bulletin For Cyclonic Activity And Significant Tropical Weather In The Southwest Indian Ocean – December 28, 1200 UTC". Météo-France. December 28, 2013. Archived from the original (PDF) on December 30, 2013. Retrieved 30 December 2013.
  6. ↑ Météo-France (December 28, 2013). "Tropical Disturbance 1 Forecast Warning Number 001/4". United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on December 29, 2013. Retrieved 30 December 2013.
  7. ↑ Joint Typhoon Warning Center (December 29, 2013). "Tropical Cyclone Formation Alert –December 29, 0300 UTC". Honolulu, Hawaii: United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on December 29, 2013. Retrieved 30 December 2013.
  8. ↑ Météo-France (December 29, 2013). "Tropical Depression 4 Warning Number 003/4". United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on December 29, 2013. Retrieved 30 December 2013.
  9. ↑ Météo-France (December 29, 2013). "Moderate Tropical Storm 4 (Bejisa) Warning Number 007/4". United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on December 30, 2013. Retrieved 30 December 2013.
  10. 1 2 Météo-France (December 29, 2013). "Moderate Tropical Storm 4 (Bejisa) Forecast Warning Number 006/4". United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on December 30, 2013. Retrieved 30 December 2013.
  11. ↑ Météo-France (December 30, 2013). "Severe Tropical Storm 4 (Bejisa) Warning Number 008/4". United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on December 30, 2013. Retrieved 30 December 2013.
  12. ↑ Météo-France (December 30, 2013). "Severe Tropical Storm 4 (Bejisa) Forecast Warning Number 008/4". United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on December 30, 2013. Retrieved 30 December 2013.
  13. ↑ Météo-France (December 30, 2013). "Tropical Cyclone 4 (Bejisa) Warning Number 009/4". Unsys. Archived from the original (TXT) on December 31, 2013. Retrieved 31 December 2013.
  14. ↑ Météo-France (December 30, 2013). "Intense Tropical Cyclone 4 (Bejisa) Warning Number 010/4". Unsys. Archived from the original (TXT) on December 31, 2013. Retrieved 31 December 2013.
  15. ↑ Météo-France (December 30, 2013). "Intense Tropical Cyclone 4 (Bejisa) Warning Number 011/4". Unsys. Archived from the original (TXT) on December 31, 2013. Retrieved April 12, 2014.
  16. ↑ Joint Typhoon Warning Center (December 31, 2013). "Tropical Cyclone 06S (Bejisa) Warning NR 005". Honolulu, Hawaii: United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on January 1, 2014. Retrieved April 12, 2014.
  17. ↑ Météo-France (December 31, 2013). "Intense Tropical Cyclone 4 (Bejisa) Forecast Warning Number 013/4". United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on December 31, 2013. Retrieved 31 December 2013.
  18. ↑ Météo-France (December 31, 2013). "Tropical Cyclone 4 (Bejisa) Forecast Warning Number 014/4". United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on January 1, 2014. Retrieved April 12, 2014.
  19. ↑ Météo-France (January 1, 2014). "Tropical Cyclone 4 (Bejisa) Forecast Warning Number 015/4". United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on January 1, 2014. Retrieved April 12, 2014.
  20. 1 2 Météo-France (January 1, 2014). "Tropical Cyclone 4 (Bejisa) Forecast Warning Number 017/4". United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on January 1, 2014. Retrieved April 12, 2014.
  21. ↑ Météo-France (January 1, 2014). "Tropical Cyclone 4 (Bejisa) Forecast Warning Number 018/4". United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on January 1, 2014. Retrieved April 12, 2014.
  22. ↑ Météo-France (January 1, 2014). "Tropical Cyclone 4 (Bejisa) Forecast Warning Number 020/4". United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on January 1, 2014. Retrieved April 12, 2014.
  23. ↑ Météo-France (January 2, 2014). "Tropical Cyclone 4 (Bejisa) Forecast Warning Number 021/4". United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on January 2, 2014. Retrieved April 12, 2014.
  24. ↑ Joint Typhoon Warning Center (January 2, 2014). "Tropical Cyclone 06S (Bejisa) Warning NR 009". Honolulu, Hawaii: United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on January 2, 2014. Retrieved April 12, 2014.
  25. ↑ Joint Typhoon Warning Center (January 2, 2014). "Tropical Cyclone 06S (Bejisa) Warning NR 010". Honolulu, Hawaii: United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on January 2, 2014. Retrieved April 12, 2014.
  26. 1 2 3 4 "France : Le cyclone Bejisa fait 15 blessés et des dégâts sur l'île de la Réunion" (in French). ReliefWeb. Agence France-Presse. January 2, 2014. Retrieved April 14, 2014.
  27. ↑ Météo-France (January 3, 2014). "Tropical Cyclone 4 (Bejisa) Forecast Warning Number 024/4". United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on January 3, 2014. Retrieved April 12, 2014.
  28. ↑ Météo-France (January 3, 2014). "Severe Tropical Storm 4 (Bejisa) Forecast Warning Number 025/4". United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on January 3, 2014. Retrieved April 12, 2014.
  29. ↑ Météo-France (January 4, 2014). "Severe Tropical Storm 4 (Bejisa) Forecast Warning Number 029/4". United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on January 4, 2014. Retrieved April 12, 2014.
  30. ↑ Météo-France (January 4, 2014). "Severe Tropical Storm 4 (Bejisa) Forecast Warning Number 031/4". United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on January 4, 2014. Retrieved April 12, 2014.
  31. ↑ Météo-France (January 5, 2014). "Moderate Tropical Storm 4 (Bejisa) Forecast Warning Number 033/4". United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on January 5, 2014. Retrieved April 12, 2014.
  32. ↑ Météo-France (January 5, 2014). "Post-Tropical Depression 4 (Bejisa) Forecast Warning Number 034/4". United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on January 5, 2014. Retrieved April 12, 2014.
  33. ↑ Joint Typhoon Warning Center (January 5, 2014). "Tropical Cyclone 06S (Bejisa) Warning NR 016". Honolulu, Hawaii: United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on January 5, 2014. Retrieved 12 April 2014.
  34. ↑ Météo-France (January 5, 2014). "Post-Tropical Depression 4 (Bejisa) Forecast Warning Number 035/4". United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on January 5, 2014. Retrieved April 12, 2014.
  35. ↑ Météo-France (January 6, 2014). "Post-Tropical Depression 4 (ex-Bejisa) Forecast Warning Number 038/4". United States National Oceanic and Atmospheric Administration. Archived from the original (TXT) on January 6, 2014. Retrieved April 12, 2014.
  36. ↑ Bulletin for Cyclonic Activity and Significant Tropical Weather in the Southwest Indian Ocean (PDF). Météo-France (Report). January 7, 2014. Retrieved April 12, 2014.
  37. ↑ 3 January 2014: World Events (PDF). European Commission (Report) (ReliefWeb). January 3, 2014. Retrieved April 13, 2014.
  38. 1 2 3 4 5 "Reunion recovering from monster storm Bejisa". Eturbo News. January 7, 2014. – via Lexis Nexis (subscription required)
  39. ↑ "Winter-sized swell sets Dungeons alight Steve Pike; Stoked surfers make hay in sets 3 storeys high". Cape Argus (South Africa). January 11, 2014. – via Lexis Nexis (subscription required)
  40. 1 2 3 "15 hurt as powerful cyclone brushes France's Reunion island". ReliefWeb. Agence France-Presse. January 2, 2014. Retrieved April 13, 2014.
  41. 1 2 "Indian Ocean - Tropical Cyclone BEJISA (COGIC) - ECHO Daily Flash 4/01/2014". European Commission Humanitarian Aid department. ReliefWeb. January 6, 2014. Retrieved April 13, 2014.
  42. ↑ 2 January 2014: Indian Ocean – Tropical Cyclone Bejisa (PDF). European Commission (Report) (ReliefWeb). January 2, 2014. Retrieved April 13, 2014.
  43. 1 2 "Bejisa s'éloigne lentement de La Réunion" (in French). Imaz Press Réunion. January 2, 2014. Retrieved January 19, 2014.
  44. 1 2 3 "EDF : l'électricité rétablie dans la quasi totalité des foyers ce jeudi soir à 23h30" (in French). Imaz Press Réunion. January 9, 2014. Retrieved January 19, 2014.
  45. 1 2 "Cyclone à la Réunion : un mort et des dégâts considérables". Agence France-Pressee (in French). Le Républican Lorrain. January 3, 2014. Retrieved January 19, 2014.
  46. 1 2 "Le gouvernement place La Réunion en état de catastrophe naturelle". Imaz Press Réunion. January 17, 2014. Retrieved January 19, 2014.
  47. ↑ "Bejisa : 3 millions d’euros de dégâts à Saint-Paul" (in French). Antenne Reunion Télévision. January 10, 2014. Retrieved January 19, 2014.
  48. 1 2 "Bejisa : Une facture de 25 millions d’euros pour les assureurs" (in French). Antenne Reunion Télévision. January 17, 2014. Retrieved January 19, 2014.
  49. ↑ "16 communes en état de catastrophe naturelle". Imaz Press Réunion. January 18, 2014. Retrieved January 19, 2014.
  50. ↑ "Bejisa : reconnaissance de l'état de calamités agricoles" (in French). Imaz Press Réunion. January 30, 2014. Retrieved April 28, 2014.
  51. ↑ "L'état de catastrophe naturelle étendu pour quatre communes" (in French). Imaz Press Réunion. April 16, 2014. Retrieved April 28, 2014.
This article is issued from Wikipedia - version of the Friday, February 19, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.