Cyclone Susan

Last updated

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
Disc Plain black.svg Tropical cyclone
Solid black.svg Subtropical cyclone
ArrowUp.svg Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

During December 20, 1997, the Fiji Meteorological Service (FMS) started to monitor a weak tropical disturbance, that was located about 915 km (570 mi) to the northwest of Pago-Pago in American Samoa. [1] [2] Over the next couple of weeks, the system gradually moved towards the west-southwest, without developing into a tropical cyclone. [1] During the opening days of January 1998, a subtropical mid-level ridge of high pressure developed inbetween Fiji and Vanuatu to the south of the system, which provided an area of low vertical wind shear for the disturbance to intensify in. [3] As a result, the system started to show signs of significant development while located near the Fiji dependency of Rotuma, before early on January 3, the United States Joint Typhoon Warning Center (JTWC) initiated warnings on the system and designated it as Tropical Cyclone 11P. [4] This was followed by the FMS who reported that the system had become a category 1 tropical cyclone, on the Australian tropical cyclone intensity scale and named it Susan. [5]

After it had been named, Susan continued to move towards the west-southwest and started to pose a severe threat to northern Vanuatu, as it continued to rapidly intensify. [2] [5] It was classified as a category 3 severe tropical cyclone during January 4, as an eye appeared on satellite imagery, atmospheric convection increased and clouds tops significantly cooled. [2] [6] [7] The ridge of high pressure also started to weaken as it interacted with a trough of low pressure, which meant that the cyclone started to turn towards the south-southwest. [8]

During January 5, the FMS reported that along with Severe Tropical Cyclone Ron, Susan had become a category 5 severe tropical cyclone and that both systems had peaked with 10-minute sustained wind speeds of 230 km/h (145 mph) and a minimum pressure of 900 hPa (26.58 inHg). [2] [9] [10] As a result, both systems were considered to be two of the most intense tropical cyclones, within the South Pacific basin, since Severe Tropical Cyclone Hina of 1984-85. [10] At around the same time, the JTWC who reported that the system had peaked with 1-minute sustained wind speeds of 260 km/h (160 mph), which made it a category 5 on the Saffir-Simpson hurricane wind scale. [2] As it peaked in intensity, Susan was located about 415 km (260 mi) to the northeast of Port Vila in Vanuatu and had started to recurve by 70 degrees towards a large weakness in the subtropical ridge. [10] [11]

Three simultaneous tropical cyclones on January 5: Katrina (left), Susan (center) and Ron (right) South Pacific Tropical Cyclones 1998-01-05 0300Z.png
Three simultaneous tropical cyclones on January 5: Katrina (left), Susan (center) and Ron (right)

Over the next couple of days, Susan maintained its peak intensity and accelerated south-eastwards, as it came under the influence of a north-westerly steering flow, which was associated with a trough of low pressure. [2] [10] [8] As a result, the system started to pose a threat to the island nation of Fiji and weaken as it interacted with cooler sea surface temperatures, cooler air and increased vertical windshear. [8] [12] [13] During January 7, Susan's eye became ragged as it continued to weaken, with the FMS reporting that the system had weakened into a category 4 severe tropical cyclone. [13] [2] During that day, the system passed close enough to Fiji, to produce gale-force winds over several of the southern and western Fijian Islands. [14] Susan subsequently absorbed the remnants of Severe Tropical Cyclone Ron during January 8, before it rapidly weakened and quickly transitioned into an extratropical cyclone, while it was located about 1,300 km (810 mi) to the northeast of Auckland, New Zealand. [14] The combined system was monitored for another day, before it was last noted during January 10, bringing an unseasonable cold snap to New Zealand. [2] [15] [16]

Effects

Cyclone Susan caused one death and at least

Vanuatu

After Susan had been named on January 3, the FMS started to issue special weather bulletins for Vanuatu, which indicated that gale-force winds might impact the northern islands within the next 24-48 hours. [5] The Vanuatu National Disaster Management Council subsequently issued various colour-coded tropical cyclone alerts which warned residents about the approaching cyclone, including a red alert for Ambae Maewo and Pentecost islands on January 5. [20] Ahead of the cyclone impacting the island nation, ships and small boats were advised to seek safe anchorage, residents were advised to stay at home, while the domestic airline Vanair cancelled its flights and closed all of its airfields. [20] On the island of Ambrym, a lady was killed by a falling coconut tree, as she collected fronds and tree branches to help protect her home against Susan. [14] [21]

Despite being spared a direct hit, heavy rain and gale-force winds caused minor damage to several Vanuatuan Islands, including on Ambrym Island, where a woman died after being hit by a falling coconut tree, while gathering supplies to secure her house with. [14] [22] [23] After the alerts were cancelled on January 7, by the National Disaster Management Council, most shops and government buildings on Efate island kept their shutters up because Cyclone Katrina was predicted to directly affect the archipelago within a few days. [24]

Fiji

Late on January 6, the FMS issued a tropical cyclone alert for Fiji, while Susan was located about 600 km (375 mi) to the west of Nadi, Fiji. [5] The alert stated that Susan, was expected to pass as close as 300 km (185 mi) to the southwest of Viti Levu during the next day. [5] They also warned that there was a chance that the cyclone would curve more towards the east-southeast and bring gale force or stronger winds over Fiji. [5] Early the next day as squally strong north to north-easterly winds were starting to affect Fiji, the FMS upgraded the alert to a gale warning for Vatulele, Kadavu, western and south-western Viti Levu and the Yasawa and Mamanuca island groups. [5] The system subsequently passed close enough to Fiji, to cause some minor coastal damage to several southern and western Fijian islands, including on the main island of Viti Levu. [14] The cyclone also brought with it some beneficial rainfall which helped to ease the drought conditions that were present in Fiji. [24] However, gale-force winds, high seas, a heavy swell and storm surge inundated Bequ Island and a village on Kadavu Island, while partly destroying beach-fronts, roads, jetties and bridges within the archipelago. [14] Within Lautoka several shops, power lines, a bus station and the roof of a shopping complex were damaged after what was believed to be either a tornado or tornadic winds developed in one of Susan's rainbands as it crossed the shoreline. [5] [10] [25] Firemen and linesmen from the Fiji Electricity Authority, were called in to assist police to clear downed power wires. [25]

See also

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References

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Severe Tropical Cyclone Susan
Susan 1998-01-05 0300Z.png
Cyclone Susan near peak intensity east of Tuvalu on January 5