Cyclone Percy

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Severe Tropical Cyclone Percy
Cyclone Percy prior to peak intensity on March 1
Meteorological history
FormedFebruary 24, 2005 (2005-02-24)
DissipatedMarch 5, 2005 (2005-03-06)
Category 5 severe tropical cyclone
10-minute sustained (FMS)
Highest winds230 km/h (145 mph)
Lowest pressure900 hPa (mbar); 26.58 inHg
Category 5-equivalent tropical cyclone
1-minute sustained (SSHWS/JTWC)
Highest winds260 km/h (160 mph)
Lowest pressure898 hPa (mbar); 26.52 inHg
Overall effects
Areas affectedAmerican Samoa, Tokelau, Cook Islands
IBTrACSEdit this at Wikidata

Part of the 2004–05 South Pacific cyclone season

Severe Tropical Cyclone Percy was an extremely powerful

ridge of high pressure, while stretched out the structure of the storm into an elliptical shape, weakening it back to Category 3 status. Afterward, the storm rapidly reintensified, reaching its peak intensity as a Category 5 tropical cyclone on March 2. Afterward, Percy encountered increasing wind shear and weakened once again, turning southeastward on the next day. On March 5, Percy transitioned into an extratropical storm
, before dissipating soon afterward.

Percy was also the most damaging of the South Pacific February cyclones that year, as it battered the Cook Islands, which were still recovering from the impacts of Cyclones Meena, Nancy and Olaf. Percy then devastated the island of Tokelau, leaving many homeless and millions in dollars in property damages (although exact damage figures are unavailable). Because of warnings in anticipation of the storm, there were no deaths and there were only a few injuries.

Meteorological history

Map plotting the storm's track and intensity, according to the Saffir–Simpson scale
Map key
  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
triangle Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

During February 23, the Fiji Meteorological Service reported that Tropical Disturbance 10F, had developed within the monsoon trough about 700 kilometres (435 mi) to the west of the Tuvaluan atoll of Funafuti.[1] The system was then located just south of a 250-hPa ridge axis, in a diffluent region. Wind shear and diurnal variations were evidently influencing development. Sea surface temperatures (SST) were around 31 °C.

Later on February 24, shear had decreased markedly. Outflow was favorable and developing in all quadrants. Overnight, the tropical depression underwent explosive development, with the deep convection increasing spatially and in organization while cooling. Spiral bands were also wrapping tightly around the low-level circulation center (LLCC). Since the depression was located in an area of low wind shear and warm water temperatures, the storm was able to quickly strengthen into Tropical Storm Percy, by 1800 UTC on February 24. At this point in time, Percy was located 120 miles (190 km) east of Fongafale, Tuvalu, and was moving towards the east-southeast at 14 knots (16 mph; 26 km/h).

On February 26, Percy reached

barometric pressure at its center fell to 925 millibars. On February 27, Cyclone Percy encountered a ridge of high pressure, which slowed its forward speed. Because of this, the cyclone's structure became elliptical, which caused the cyclone to weaken back to Category 3 status.[2]
By February 28, Percy bypassed the Pukapuka and Nassau Islands as a Category 3 tropical cyclone, as it continued to move south-southeastward.

By then, the cyclone was re-organizing as the storm was steered to the southeast. On March 2, Percy reached its peak intensity, with sustained winds reached 160 mph (140 knots (260 km/h)) on the

extratropical at 1200 UTC. By March 5, the remnants of Percy finally dissipated 700 miles (1,100 km) southwest of Rarotonga.[3]

Preparations

When Percy quickly reached tropical cyclone strength, forecasters began to issue watches and warnings for the American Samoa and Tokelau areas, which were impacted by earlier storms Nancy and Olaf.[4] As Percy continued to move eastward, forecasters predicted the storm to strengthen into a Category 2 or Category 3 storm within 12–24 hours. meanwhile, forecasters issued gale warnings for Tokelau.[5] On 26 February, forecasters predicted Percy would stay on its current track and miss the island of Atafu by 50–70 miles (80–113 km), even though the storm could bring damaging gale-force winds and heavy rains to the island. However, forecasters predicted Percy would make landfall on Tokelau. In American Samoa, hurricane warnings were issued for Swains Island, while the rest of American Samoa remained under a hurricane watch.[6] Later, the gale warnings for Tokelau were changed to hurricane warnings as Percy moved to within 75 miles (121 km) north of Atafu. In Nukunou and Fakaofo, forecasters predicted that the cyclone would bring 60–70 mph (97–113 km/h) winds, heavy rains and possible flooding in low-lying areas.[7]

Forecasters predicted that Cyclone Percy was going to turn to the southeast and hit the islands of

Southern Cook Islands to order evacuations.[8]

Effects

Severe Tropical Cyclone Percy impacted Tokelau, Samoa, American Samoa as well as the Northern and Southern Cook Islands, where it caused widespread damage. Like the earlier cyclones Meena, Nancy, and Olaf, Percy left widespread damage across Swains Island, Tokelau, and the northern Cook Islands. However, because of well-executed warnings, there were no deaths and there were only a few injuries. Percy was the worst cyclone to strike Tokelau since a similar cyclone hit the area in 1966.[9]

Tokelau

Cyclone Percy hitting Swains Island on February 27, 2005

Percy impacted Tokelau between February 25–27, where it caused widespread damage within the three

Nukunono and Fakaofo.[10][11] However, these warnings were not received on the islands and the first notification of the impending cyclone came in a telephone call from New Zealand.[12]

A hurricane warning was also issued for the disputed territory of Swains Island during that day by the United States Weather Service Office in Pago Pago, American Samoa.[13]

American Samoa and Tokelau

The strong winds from Percy knocked out power and communications infrastructure in Swains Island. Efforts to re-establish contact with the island were unsuccessful for a week. After the storm, however, all eight people who rode out the storm survived, though nine of the eleven buildings on the islands were destroyed or severely damaged.[3] Damage in American Samoa was minimal.[14] In Tokelau, Percy damaged trees and knocked down powerlines.[3] During the height of the storm, one person was injured by flying debris, and two others were swept out to sea, but all three survived. In Nokonunu, the cyclone destroyed the only school and damaged 80% of the structures. The local hospital completely lost power during the storm and its emergency generator was overwhelmed by the flooding.[15][16]

In

UHF tower and several storage sheds. Damage to crops was also significant as the storm damaged much of the banana and pandanus harvests. The schools in Atafu suffered only minimal damage (mostly wind damage).[16]

Cook Islands

The Northern Cook Islands were hardest hit by Percy as the storm left 640 people homeless, of which 600 were in Pukapuka, and 40 were in Nassau. Of the buildings and houses destroyed or severely damaged, only ten were left standing.[3] One person was rescued when his fishing boat stalled during the storm.[17] Percy also damaged a solar power station, making it inoperable.[18] Percy also battered the southern Cook Islands while weakening, although the damage there was minimal.[19]

Aftermath

A building in Tokelau damaged by Cyclone Percy

Relief efforts followed after Cyclone Percy. In

USD) in relief aid.[20]

In

mosquitoes and other insects, increasing the threat of a dengue fever outbreak. In addition, the storm damaged many of the hospitals, making treatment of the injured or displaced difficult.[21] Criticism of government preparedness followed after Percy as emergency plans were not easily understood by the local population. In Nukunonu, the school, which was destroyed by Percy, was poorly built and vulnerable, and there was no early warning system. Also, many of the population had little time to prepare for the storm because of a social event held hours earlier.[16]

See also

References

  1. ^ RSMC Nadi — Tropical Cyclone Centre. Tropical Cyclone Summary 2004 – 2005 Season (PDF) (Report). Fiji Meteorological Service. Archived from the original (PDF) on February 25, 2009. Retrieved November 22, 2012.
  2. ^ a b Percy report Retrieved:June 12, 2006
  3. ^ a b c d e Monthly Global Tropical Cyclone Summary February 2005
  4. ^ AP Warning 1 Archived 2006-02-11 at the Wayback Machine Retrieved:12 June 2006
  5. ^ AP Warning 2 Archived 2006-02-11 at the Wayback Machine Retrieved:12 June 2006
  6. ^ AP Warning 3 Archived 2006-02-11 at the Wayback Machine Retrieved:12 June 2006
  7. ^ AP Warning 4 Archived 2006-02-11 at the Wayback Machine Retrieved:12 June 2006
  8. ^ AP Warning 5 Archived 2006-02-06 at the Wayback Machine Retrieved:12 June 2006
  9. ^ Evaluations and Lessons Learned: Cook Islands and Tokelau: Tropical Cyclone Percy – March 2005, Cook Islands and Tokelau: Tropical Cyclone Percy – OCHA Situation Report No. 5, Situation Reports: Cook Islands and Tokelau: Tropical Cyclone Percy – 20 March
  10. ^ Special Weather Bulletin Number Two for the Tokelau Islands (Report). Fiji Meteorological Service. February 25, 2005.
  11. ^ Special Weather Bulletin Number Five for the Tokelau Islands (Report). Fiji Meteorological Service. February 25, 2005.
  12. ^ "Archived copy" (PDF). www.undp.org.ws. Archived from the original (PDF) on 4 November 2005. Retrieved 12 January 2022.{{cite web}}: CS1 maint: archived copy as title (link)
  13. ^ Tropical Cyclone Percy... Local Statement 01 (Report). United States Weather Service Office Pago Pago. February 25, 2005.
  14. ^ AP Warning Archived 2006-02-06 at the Wayback Machine Retrieved 12 June 2006
  15. ^ "ABC (Australia) News Online: Percy devastates Tokelau". Australian Broadcasting Corporation. Archived from the original on 2005-12-03. Retrieved 2006-05-09.
  16. ^ a b c UNDP damage assessment Archived 2006-05-23 at the Wayback Machine Retrieved 12 June 2006
  17. ^ Planet Ark.com: State of Emergency declared after Cyclone Percy Retrieved:12 June 2006
  18. ^ www.ser.org Archived 2006-09-27 at the Wayback Machine
  19. ^ "Cooks police say no damage reports as cyclone passes south west of Rarotonga". RNZ. 4 March 2005. Retrieved 7 August 2020.
  20. ^ Australian Government Overseas Aid Archived 2006-05-26 at the Wayback Machine Retrieved:12 June 2006
  21. ^ Relief Web Retrieved:12 June 2006

External links