Cyclone Donna

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Map key
Saffir–Simpson scale
  Tropical depression (≤38 mph, ≤62 km/h)
  Tropical storm (39–73 mph, 63–118 km/h)
  Category 1 (74–95 mph, 119–153 km/h)
  Category 2 (96–110 mph, 154–177 km/h)
  Category 3 (111–129 mph, 178–208 km/h)
  Category 4 (130–156 mph, 209–251 km/h)
  Category 5 (≥157 mph, ≥252 km/h)
  Unknown
Storm type
Disc Plain black.svg Tropical cyclone
Solid black.svg Subtropical cyclone
ArrowUp.svg Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

On 1 May, the day after the official end of the South Pacific cyclone season, the Joint Typhoon Warning Center (JTWC) began monitoring an area of disturbed weather about 1,455 km (905 mi) west-northwest of Nadi. Though it possessed an oblong area of low pressure partially exposed to the northeast of deep shower and thunderstorm activity, the system was embedded within an environment of moderate wind shear, good upper-level outflow, and warm ocean temperatures. [1] The official warning agency for the South Pacific, the Fiji Meteorological Service (FMS), began monitoring the disturbance a short while later. [2] As fragmented spiral bands began wrapping into the centre of circulation, the JTWC assessed that the potential for tropical cyclone formation was high, issuing a Tropical Cyclone Formation Alert accordingly at 21:00 UTC on 1 May. [3] The storm tracked slowly eastward through the northern islands of Vanuatu but consolidated rapidly as upper-level winds became light, prompting the FMS to upgrade the disturbance to Tropical Depression 21F at 18:00 UTC on 2 May. [4] This was followed by the JTWC's classification of Tropical Cyclone 18P three hours later. [5]

Following formation, the depression turned west in response to a developing subtropical ridge to its south. [6] A continued favourable environment allowed it to intensify into a Category 1 on the Australian tropical cyclone scale by 06:00 UTC on 3 May, at which point it was named "Donna" by the FMS, [7] and further to Category 2 intensity by 18:00 UTC. [8] The JTWC, meanwhile, upped the cyclone to the equivalent of a Category 1 hurricane on the Saffir–Simpson scale, citing consolidation of deep convection near the centre and satellite intensity estimates around 120 km/h (75 mph). [9] Despite some evidence of wind shear along the northern fringes of the storm, it began to clear an eye late on 4 May, prompting the JTWC to classify Donna as a Category 2 equivalent, [10] and the FMS to upgrade to Category 3 strength. [11] At 00:00 UTC on 6 May, after re-tracking through Vanuatu and beginning a southward track, Donna attained its initial peak as a Category 4 cyclone. [12] [13]

Shortly thereafter, the effects of increased northeasterly upper-level flow became more prevalent as the storm's cloud pattern changed to a central cold cover and then devolved into patchy areas of moderate convection. [14] Around 09:00 UTC on 6 May, the JTWC reduced the storm back to a Category 1 equivalent, [15] and by 18:00 UTC, the FMS indicated Donna had weakened to a Category 3 cyclone on the Australian scale. [16]

Drifting south-southwest and then south, Donna continued to struggle under the combined effects of upper-level winds and ocean upwelling. [17] By early on 7 May, however, convection within the eyewall began to increase in intensity, [18] and the FMS upgraded Donna to a Category 4 cyclone for a second time accordingly. [19] Three hours later, the JTWC estimated that it had intensified to a Category 4 equivalent, completely skipping Category 3 status. [20] With a solid ring of deep convection surrounding a well-defined 55 km (35 mi) eye, [21] the FMS upgraded Donna to a Category 5 cyclone at 00:00 UTC on 8 May, estimating that the storm possessed 10-minute sustained winds of 205 km/h (125 mph). [22] As a result, Donna became the strongest off-season tropical cyclone on record during the month of May in the South Pacific basin. [23] Weakening began shortly following peak intensity as Donna's eye became partially obscured and the eastern eyewall was eroded; [24] the storm weakened back to Category 4 intensity by 18:00 UTC on 8 May, [25] Category 1 intensity by 21:00 UTC on 9 May, [26] and ultimately degenerated into a tropical low by 06:00 UTC on 10 May as it dodged New Caledonia. [27]

Preparations and impact

According to Aon Benfield Inc. in January 2018, Donna was responsible for two deaths and a total of US$10 million in damage. [28]

Vanuatu

As Donna buffeted Vanuatu, entire villages across the Torres Islands of Torba Province were forced to seek refuge in caves. Throughout the province, buildings were destroyed and others had their roofs ripped off. Heavy rainfall led to flooding of low-lying areas of Efate. In Port Vila, rushing water carved out large chunks of land that resulted in structural collapse. [29] Across the entire northern half of the island chain, crops sustained significant damage and water sources were contaminated, though the full extent of the damage was unknown as a result of severed communications. [30] [31]

Solomon Islands

In the Temotu Province, Donna caused two fatalities; an adult who was struck by a fallen branch and a primary school student of Tarano School who drowned on an out-board motorboat when crossing from one-side to the other side of a lake. [32]

New Zealand

Moisture from the remnants of Donna combined with a weakening Tasman Sea low to produce heavy rains over much of the North Island and the west coast of the South Island. In expectation of more than 100 mm (3.9 in) of rain, heavy rain warnings were issued for Nelson and the Bay of Plenty regions, while severe weather warnings were issued for much of the North Island. [33] [34]

See also

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References

  1. ↑ Significant Tropical Weather Advisory for the western and South Pacific Oceans (Report). Joint Typhoon Warning Center. 1 May 2017. Archived from the original on 21 May 2024. Retrieved 7 May 2017.
  2. ↑ Tropical Disturbance Summary (Report). Fiji Meteorological Service. 1 May 2017. Archived from the original on 21 May 2024. Retrieved 7 May 2017.
  3. ↑ Tropical Cyclone Formation Alert (Report). Joint Typhoon Warning Center. 1 May 2017. Archived from the original on 21 May 2024. Retrieved 7 May 2017.
  4. ↑ Marine Weather Bulletin for Islands Area (Report). Fiji Meteorological Service. 2 May 2017. Archived from the original on 21 May 2024. Retrieved 7 May 2017.
  5. ↑ Tropical Cyclone 18P (Eighteen) Warning NR 001 (Report). Joint Typhoon Warning Center. 2 May 2017. Archived from the original on 21 May 2024. Retrieved 7 May 2017.
  6. ↑ Tropical Cyclone 18P (Donna) Warning NR 002 (Report). Joint Typhoon Warning Center. 3 May 2017. Archived from the original on 21 May 2024. Retrieved 7 May 2017.
  7. ↑ Hurricane Warning 003 Issued from RSMC Nadi May 030716 UTC (Report). Fiji Meteorological Service. 3 May 2017. Archived from the original on 21 May 2024. Retrieved 7 May 2017.
  8. ↑ Hurricane Warning 005 Issued from RSMC Nadi May 031913 UTC (Report). Fiji Meteorological Service. 3 May 2017. Archived from the original on 21 May 2024. Retrieved 7 May 2017.
  9. ↑ Tropical Cyclone 18P (Donna) Warning NR 003 (Report). Joint Typhoon Warning Center. 3 May 2017. Archived from the original on 21 May 2024. Retrieved 7 May 2017.
  10. ↑ Tropical Cyclone 18P (Donna) Warning NR 005 (Report). Joint Typhoon Warning Center. 4 May 2017. Archived from the original on 21 May 2024. Retrieved 7 May 2017.
  11. ↑ Hurricane Warning 012 Issued from RSMC Nadi May 050114 UTC (Report). Fiji Meteorological Service. 5 May 2017. Archived from the original on 21 May 2024. Retrieved 7 May 2017.
  12. ↑ Hurricane Warning 020 Issued from RSMC Nadi May 060115 UTC (Report). Fiji Meteorological Service. 6 May 2017. Archived from the original on 21 May 2024. Retrieved 7 May 2017.
  13. ↑ "Cyclone Donna upgraded to category four storm". Stuff (Fairfax Media). 6 May 2017.
  14. ↑ Tropical Cyclone 18P (Donna) Warning NR 010 (Report). Joint Typhoon Warning Center. 6 May 2017. Archived from the original on 21 May 2024. Retrieved 7 May 2017.
  15. ↑ Tropical Cyclone 18P (Donna) Warning NR 011 (Report). Joint Typhoon Warning Center. 6 May 2017. Archived from the original on 22 May 2024. Retrieved 7 May 2017.
  16. ↑ Hurricane Warning 026 Issued from RSMC Nadi May 061909 UTC (Report). Fiji Meteorological Service. 6 May 2017. Archived from the original on 22 May 2024. Retrieved 7 May 2017.
  17. ↑ Tropical Cyclone 18P (Donna) Warning NR 014 (Report). Joint Typhoon Warning Center. 6 May 2017. Archived from the original on 22 May 2024. Retrieved 7 May 2017.
  18. ↑ Tropical Cyclone 18P (Donna) Warning NR 016 (Report). Joint Typhoon Warning Center. 7 May 2017. Archived from the original on 22 May 2024. Retrieved 7 May 2017.
  19. ↑ Hurricane Warning 035 Issued From RSMC Nadi May 071903 UTC (Report). Fiji Meteorological Service. 7 May 2017. Archived from the original on 22 May 2024. Retrieved 7 May 2017.
  20. ↑ Tropical Cyclone 18P (Donna) Warning NR 017 (Report). Joint Typhoon Warning Center. 7 May 2017. Archived from the original on 22 May 2024. Retrieved 7 May 2017.
  21. ↑ Tropical Cyclone 18P (Donna) Warning NR 018 (Report). Joint Typhoon Warning Center. 8 May 2017. Archived from the original on 22 May 2024. Retrieved 8 May 2017.
  22. ↑ Hurricane Warning 038 Issued From RSMC Nadi May 080118 UTC (Report). Fiji Meteorological Service. 8 May 2017. Archived from the original on 22 May 2024. Retrieved 8 May 2017.
  23. ↑ Matt Burrows (8 May 2017). "Cyclone Donna now category 5, breaks global record". Newshub. Retrieved 8 May 2017.
  24. ↑ "Tropical Cyclone 18P (Donna) Warning NR 019". Joint Typhoon Warning Center. 8 May 2017. Archived from the original on 22 May 2024. Retrieved 11 May 2017.
  25. ↑ "Hurricane Warning 047 Issued from RSMC Nadi May 081919 UTC". Fiji Meteorological Service. 9 May 2017. Archived from the original on 22 May 2024. Retrieved 11 May 2017.
  26. ↑ "Gale Warning 063 Issued from RSMC Nadi May 092152 UTC". Fiji Meteorological Service. 9 May 2017. Archived from the original on 22 May 2024. Retrieved 11 May 2017.
  27. ↑ "Gale Warning 067 Issued from RSMC Nadi May 100840 UTC". Fiji Meteorological Service. 10 May 2017. Archived from the original on 22 May 2024. Retrieved 11 May 2017.
  28. ↑ "Companion Volume to Weather, Climate & Catastrophe Insight" (PDF). Aon Benfield. 24 January 2018. Archived from the original (PDF) on 2 March 2018. Retrieved 30 January 2018.
  29. ↑ "Tropical Cyclone Donna becomes Category 5 storm, worst May storm on record in South Pacific". The New Zealand Herald. 8 May 2017. Retrieved 8 May 2017.
  30. ↑ "Still fierce, Cyclone Donna moving towards New Caledonia". Radio New Zealand. 8 May 2017. Retrieved 8 May 2017.
  31. ↑ "Cyclone Donna lashes Vanuatu". Stuff (Fairfax Media). 7 May 2017.
  32. ↑ "Damages reported in Temotu". Solomon Star. 15 May 2017. Archived from the original on 21 May 2017.
  33. ↑ "Heavy rain forecast for Thursday and Friday as Donna combines with Tasman low". The New Zealand Herald. 10 May 2017. Retrieved 11 May 2017.
  34. ↑ Newshub staff (11 May 2017). "Weather: Cyclone Donna leftovers bring heavy rain to New Zealand". Newshub. Retrieved 11 May 2017.
Severe Tropical Cyclone Donna
Donna 2017-05-08 0230Z.jpg
Cyclone Donna north of New Caledonia at peak intensity on 8 May
Tropical cyclones of the 2016–17 South Pacific cyclone season
2016-2017 South Pacific cyclone season summary.png
DI
01F
DI
02F
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03F
TD
04F
TD
05F
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06F
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07F
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08F
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09F
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10F
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11F
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12F
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Bart
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16F
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Donna
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Ella
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