Cyclone Drena

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Severe Tropical Cyclone Drena
Category 4 severe tropical cyclone (Aus scale)
Category 4 (Saffir–Simpson scale)
File:DRENA 1997 jan 06 0322Z.png
Tropical Cyclone Drena on January 6, 1997
Formed January 2, 1997
Dissipated January 13, 1997
(Extratropical after January 9, 1997)
Highest winds 10-minute sustained: 165 km/h (105 mph)
1-minute sustained: 220 km/h (140 mph)
Lowest pressure 935 hPa (mbar); 27.61 inHg
Fatalities 3 total
Damage $6.7 million (1997 USD)
Areas affected Vanuatu, New Caledonia and New Zealand
Part of the 1996–97 South Pacific and Australian region cyclone seasons

Cyclone Drena was a powerful tropical cyclone that caused significant damage throughout New Zealand. A tropical depression formed on January 2. After crossing Vanuatu and emerging into the Coral Sea, the storm began to intensify, and by January 6, had attained peak intensity. After attaining peak intensity, Drena began to weaken. Cyclone Drena later brushed New Caledonia, bringing some damage. After transitioning into an extratropical cyclone on January 9, Drena brought impact to New Zealand. Damage totaled to $6.7 million and 3 people were killed. Roughly 140 people were evacuated after 44 homes were flooded. After the season, Drena was retired.

Meteorological history

File:Drena 1997 track.png
Map plotting the track and intensity of the storm according to the Saffir–Simpson hurricane wind scale

The precursor system to Severe Tropical Cyclone Drena was first noted during January 1, 1997, as an area of low pressure located within the monsoon trough to the north of Fiji.[1][2] During that day the system moved south-westwards as and underwent a cyclogenesis phase, as atmospheric convection surrounding the system rapidly intensified.


Drena originated from a low that was first monitored in the monsoon trough. Moving west-southwest and into the Coral Sea, inflow aided development of the low.[2] On January 1, the Joint Typhoon Warning Center (JTWC) recorded that a tropical depression had formed.[3] About 24 hours later, RSMC Nadi announced that a tropical depression had formed near Vanuatu.[4] Meanwhile, the JTWC reported that the depression had intensified into a tropical storm.[3] After intensifying into a Category 1 cyclone on the Australian intensity scale (according to Nadi), and was thus named, Drena re-curved southeast as it interacted with a trough.[2]

On January 6, Nadi reported that Drena had strengthened into a Category 2 cyclone.[4] Around that time, the JTWC reported that Drena had intensified into a Category 1 hurricane on the Saffir–Simpson hurricane scale.[3] The next day, according to RSMC Nadi the storm intensified further into a Category 3 cyclone.[4] Simultaneously, the JTWC remarked that Drena had become a Category 2 hurricane. The following day, the JTWC estimated that Drena had strengthened further, into a Category 3 hurricane.[3]

According to Nadi, Drena reached a peak intensity of 105 mph (169 km/h) and a pressure of 935 mbar (27.6 inHg) early on January 6.[4] However, data released by the JTWC indicates that Drena peaked with winds of 145 mph (233 km/h) a day earlier. Moving south-east, the cyclone weakened due to increased wind shear ahead of the trough.[2] By 1800 UTC January 6, RSMC Nadi announced that Drena had weakened into a Category 3 cyclone.[4] Around this time, the JTWC noted that Drena had weakened into a Category 3 hurricane.[3] The following day, the JTWC and Nadi both reduced the intensity of the system to Category 2 status on their respective scales.[3][4]

On January 8, the weakening Cyclone Drena brushed the island of New Caledonia with sustained winds up to 150 km/h (90 mph 10-minute winds).[4] Continuing to weakening, the JTWC claimed that Drena had weakened into a Category 1 system on the Saffir-Simpson Hurricane Scale.[3] Subsequently, Nadi remarked that Drena has weakened into a Category 1 cyclone.[4] While Drena accelerated to the southeast, it weakened further and became an extratropical cyclone near New Zealand on January 9[2] The system was last noted by MetService and the JTWC during December 13, while it was located over 1,500 km (930 mi) to the south-east of Wellington, New Zealand.[4][3]

Preparations and impact

While it was active Drena impacted the Solomon Islands, Vanuatu, New Caledonia, Norfolk Island and New Zealand, some of which had been affected by Severe Tropical Cyclone Fergus a few days earlier. As a result of the impact caused by the system the name Drena was retired after the season had ended, by the World Meteorological Organization's RA V Tropical Cyclone Committee. Drena affected the Solomon Islands between January 3 – 6, 1997, with residents of Rennell and Bellona Province, ordered to head to higher ground, as the system caused large sea swells with an average height of 4 metres (13 ft).[5][6]

Ahead of impacting most of New Caledonia's west coast between January 7–8, the territory was placed on a maximum alert with residents asked to stay indoors during the cyclone.[7][8]


Cyclone Drena caused extensive damage to property and crops, as it impacted most of New Caledonia's West Coast between January 7–8.

Heavy rains accompanied the storm, peaking at 474 mm (18.7 in) in Dzumac. La Foa also recorded 202 mm (8.0 in) of rain. Wind gusts reached 165 km/h (105 mph) in Koumac.[9] Almost all crops were destroyed and many roads were flooded.[10] High winds knocked out power and communication to most of the island.[9][11]

After Drena had impacted New Caledonia it moved south-eastwards and passed over Norfolk Island, while transitioning into an extra-tropical cyclone.


Severe Tropical Cyclone Drena was responsible for damaged roads, property, and agriculture to New Zealand.[12] Overall, damage totaled to $6.7 million (1996 USD). Insurance payouts totaled to $3.2 million. Meanwhile, damage to roads totaled to $2 million and over $1.5 million was down to property.[13] A total of 3 deaths were reported.[13] One man was electrocuted during the storm when he grabbed a fallen powerline when he was climbing up a bank.[14] In addition, An elderly couple died when their car slid sideways into another car on a road.[13] High waves from Cyclone Drena crashed against sea walls along the northern coast of New Zealand.[12]

Roughly 140 people were evacuated at Moanatairi while residents from 20 homes were evacuated at Moanatairi, Te Puru, and Waiomu. A total of 44 homes were flooded and subsequently damaged; 33 of which had soaked carpets and ruined walls and furniture. Considerable damage was recorded on North Island, trees and powerlines were downed and house roofs were lifted. Severe damage was reported in a Northland camp ground. One road was closed for 30 hours. In Auckland City, widespread damage and flooding was reported. Offshore, ferries were cancelled. In Maramarua, around 30 customers were without power for several hours. Several trams were flooded in Waikawau. Several rives were flooded in the Southland. Throughout the island, widespread rains and flooding was reported. In addition. Hauraki Gulf measured winds of up to 160 km/h (99 mph). In Thames, 3.6 m (12 ft) swells were measured. Christchurch received 47 mm (1.9 in) of rain.[13]

See also

References

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  2. ↑ 2.0 2.1 2.2 2.3 2.4 Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ Lua error in package.lua at line 80: module 'strict' not found.  – via Lexis Nexis (subscription required)
  7. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ Lua error in package.lua at line 80: module 'strict' not found.  – via Lexis Nexis (subscription required)
  9. ↑ 9.0 9.1 Lua error in package.lua at line 80: module 'strict' not found.
  10. ↑ (French) Lua error in package.lua at line 80: module 'strict' not found.
  11. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  12. ↑ 12.0 12.1 Lua error in package.lua at line 80: module 'strict' not found.
  13. ↑ 13.0 13.1 13.2 13.3 Lua error in package.lua at line 80: module 'strict' not found.
  14. ↑ Lua error in package.lua at line 80: module 'strict' not found.

External links

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