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Cyclone Ruby

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Not to be confused with Cyclone Rusty or Cyclone Robyn.
Tropical Cyclone Ruby
Current storm status
Category 1 tropical cyclone (Australian scale)
Current storm status
Tropical storm (1-min mean)
Satellite image
Forecast map
As of:20:00 AEST (12:00 UTC), 12 December
Location:15°18′S 158°30′E / 15.3°S 158.5°E / -15.3; 158.5 (Tropical Cyclone Ruby) ± 30 nautical miles
About 1,080 km (670 mi) WNW of Port Vila, Vanuatu
About 1,140 km (710 mi) NW of Nouméa, New Caledonia
Sustained winds:40 kn (75 km/h; 45 mph) (10-min mean)
gusting to 55 kn (100 km/h; 65 mph)
50 kn (95 km/h; 60 mph) (1-min mean)
Pressure:995 hPa (29.38 inHg)
Movement:SE at 8 kn (15 km/h; 10 mph)
See latest official information.

Tropical Cyclone Ruby is an intensifying tropical cyclone in the Coral Sea that is threatening New Caledonia with strong winds and rainfall, after its predecessor tropical low and a nearby trough caused disruption over some parts of the Solomon Islands. The fifth tropical low and third named system of the 2021-22 Australian region cyclone season, Ruby formed from an area of convection that was first monitored by the JTWC on 8 December in the Solomon Sea. However, the system didn't fully became a tropical low until 06:00 UTC of 10 December, where the BoM started to issue bulletins. After stalling over the area, it moved southeastwards over the Coral Sea, where it continued to develop under favorable conditions, and the system was finally upgraded into Tropical Cyclone Ruby, two days later as gale-force winds encircled its eastern portions.

Wind and rainfall alerts were placed over some islands of the Solomon Islands, due to a trough and the cyclone's predecessor. Two reservoirs, namely the Kombito and Kongulai River were closed and the public that is using the waters of the enbankments were advised to boil their waters as the rivers were contaminated with some sediments, which is linked to the rainfall from the system. Later, cyclone pre-watches were issued for the whole island of New Caledonia as Ruby slowly approached the archipelago.

Meteorological history

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

By 6 December, the Australian Bureau of Meteorology started to monitor the Solomon Sea and its adjoining regions for possible tropical development.[1] On the next day, the agency noted that this potential system may develop further.[2] Meanwhile, on 8 December at 06:00 UTC, the Joint Typhoon Warning Center started to track the system as "Invest 93P" while being located to 225 nautical miles (417 km; 259 mi) to the Honiara's west. At that time, the bureau noted weak convection winds around a large low-level circulation center. The sprawling disturbance is also analysed as being located in a "marginally favorable" environment by the JTWC, citing low to moderate wind shear and conducive 30–31 °C (86–88 °F) sea surface temperatures. However, the agency only gave the system a "low" chance of developing for the following 24 hours.[3] At 04:30 UTC on the next day (14:30 AEST on the previous day), the BoM designated this storm as "07U", despite the disturbance still not becoming a tropical low.[4] The JTWC further upgraded the system's chances of strengthening to "medium" by 06:00 UTC of 9 December, and to "high" by 21:30 UTC. The agency also issued a Tropical Cyclone Formation Alert (TCFA) by the latter time.[5][6]

By the next day, the BoM noted an increase in the tropical low's organization, although its northern portion weakened. However, its southern side developed as it tracked south-southeastwards. This also indicated that the tropical low fully formed already.[7] Despite this, the system remained at its initial intensity of 25 knots (46 km/h; 29 mph), despite favorable conditions, including strong divergence from an upper-level trough over eastern Australia.[8] Its convection again degraded by 18:00 UTC, but another new chunk just formed over the low's eastern part.[9] The system also became quasi-stationary over the Coral Sea, and further became disorganized by the near-midnight.[10] The BoM also experienced difficulties in identifying the system's center by 11 December, although it slightly strengthened to 30 knots (56 km/h; 35 mph) by 06:00 UTC as per scatterometer data. The system also began to track southeastwards at this time. However, dry air were also detected in its northwest.[11][12][13]

By 18:00 UTC, the BoM noted that there are already possible gale-force winds around its convective bands, although they kept the intensity below tropical storm status. Three hours later, the JTWC upgraded the system to a tropical storm while located over 767 nautical miles (1,420 km; 883 mi) to Noumea's northwest.[14][15] Further development ensued as the tropical low slowly moved over the Coral Sea, and by 03:00 UTC, the BoM upgraded the system to a Category 1 tropical cyclone on the Australian scale and was named "Ruby" respectively.[16][17]

Current storm information

As of 20:00 AEST (12:00 UTC) 12 December, Tropical Cyclone Ruby is located within 30 nautical miles of 15°18′S 158°18′E / 15.3°S 158.3°E / -15.3; 158.3 (Ruby), which is approximately about 1,080 km (670 mi) west-northeast of Port Vila, Vanuatu and about 1,140 km (710 mi) northwest of Nouméa, New Caledonia. Maximum 10-minute sustained winds are at 40 kn (75 km/h; 45 mph), gusting up to 55 kn (100 km/h; 65 mph). while maximum 1-minute sustained winds are at 50 knots (95 km/h; 60 mph) The minimum barometric pressure is 995 hPa (29.38 inHg) and the system moving southeast at 8 kn (15 km/h; 10 mph).

For the latest official information, see

Preparations and impacts

Solomon Islands

Due to the cyclone's tropical low predecessor along with a trough active over the country, the Solomon Islands Meteorological Services issued a strong wind and heavy rain warnings for the archipelago.[18][19] Individuals living near rivers were also advised to prepare and take the necessary precautions, according to the meteorological agency.[20] Due to the downpour, several sediments contaminated the reservoirs at Kombito and Kongulai Rivers, forcing the water authority of the country to close them and them alerting people to boil their waters for their safety. The newspaper Solomon Star also noted that many children faced vomiting and diarrhea problems due to the incident.[21] By 10 December, the water reservoir at Kongulai were successfuly restored.[22]

New Caledonia

Winds around 150 kilometres per hour (93 mph) and torrential rainfall were expected in New Caledonia from the storm. By 11 December, the country was placed under a cyclone pre-alert due to the brewing storm, starting at 5:00 NCST (18:00 UTC). 29 municipalities in the country were also placed under "yellow vigilance".[23][24][25]

See also

References

  1. ^ "Tropical Cyclone Outlook for the Coral Sea Issued at 2:40 pm EST on Monday 6 December 2021 for the period until midnight EST Thursday 9 December 2021". Australian Bureau of Meteorology. 6 December 2021. Archived from the original on 6 December 2021. Retrieved 10 December 2021.
  2. ^ "Tropical Cyclone Outlook for Coral Sea Issued at 2:49 pm EST on Tuesday 7 December 2021 for the period until midnight EST Friday 10 December 2021". Australian Bureau of Meteorology. 7 December 2021. Archived from the original on 7 December 2021. Retrieved 10 December 2021.
  3. ^ "Significant Tropical Weather Advisory for the Western and South Pacific Oceans 080600Z-090600Z December 2021". United States Joint Typhoon Warning Center. 8 December 2021. Archived from the original on 8 December 2021. Retrieved 10 December 2021.
  4. ^ "Tropical Cyclone Outlook for Coral Sea Issued at 2:30 pm EST on Wednesday 8 December 2021 for the period until midnight EST Saturday 11 December 2021". Australian Bureau of Meteorology. 8 December 2021. Archived from the original on 8 December 2021. Retrieved 10 December 2021.
  5. ^ "Significant Tropical Weather Advisory for the Western and South Pacific Oceans 090600Z-100600Z December 2021". United States Joint Typhoon Warning Center. 9 December 2021. Archived from the original on 9 December 2021. Retrieved 10 December 2021.
  6. ^ "Tropical Cyclone Formation Alert (Invest 93P)". United States Joint Typhoon Warning Center. 9 December 2021. Archived from the original on 9 December 2021.
  7. ^ "Tropical Cyclone Technical Bulletin Number 1 for Tropical Low 07U". bom.gov.au. Australian Bureau of Meteorology. 10 December 2021. Archived from the original on 10 December 2021. Retrieved 11 December 2021.
  8. ^ "Tropical Cyclone Technical Bulletin Number 2 for Tropical Low 07U". bom.gov.au. Australian Bureau of Meteorology. 10 December 2021. Archived from the original on 10 December 2021. Retrieved 11 December 2021.
  9. ^ "Tropical Cyclone Technical Bulletin Number 3 for Tropical Low 07U". bom.gov.au. Australian Bureau of Meteorology. 10 December 2021. Archived from the original on 10 December 2021. Retrieved 11 December 2021.
  10. ^ "Significant Tropical Weather Advisory for the Western and South Pacific Oceans 102230Z-110600Z December 2021". United States Joint Typhoon Warning Center. 10 December 2021. Archived from the original on 9 December 2021. Retrieved 11 December 2021.
  11. ^ "Tropical Cyclone Technical Bulletin Number 4 for Tropical Low 07U". bom.gov.au. Australian Bureau of Meteorology. 11 December 2021. Archived from the original on 11 December 2021. Retrieved 12 December 2021.
  12. ^ "Tropical Cyclone Technical Bulletin Number 5 for Tropical Low 07U". bom.gov.au. Australian Bureau of Meteorology. 11 December 2021. Archived from the original on 11 December 2021. Retrieved 12 December 2021.
  13. ^ "Tropical Cyclone Technical Bulletin Number 6 for Tropical Low 07U". bom.gov.au. Australian Bureau of Meteorology. 11 December 2021. Archived from the original on 11 December 2021. Retrieved 12 December 2021.
  14. ^ "Tropical Cyclone Technical Bulletin Number 7 for Tropical Low 07U". bom.gov.au. Australian Bureau of Meteorology. 11 December 2021. Archived from the original on 11 December 2021. Retrieved 12 December 2021.
  15. ^ Prognostic Reasoning for Tropical Storm 03P (Three) Warning No. 1 (Report). United States Joint Typhoon Warning Center. 11 December 2021. Retrieved 11 December 2021. {{cite report}}: |archive-url= requires |archive-date= (help)
  16. ^ "Tropical Cyclone Technical Bulletin Number 7 for Tropical Low 07U". bom.gov.au. Australian Bureau of Meteorology. 12 December 2021. Archived from the original on 12 December 2021. Retrieved 12 December 2021.
  17. ^ "Updated Tropical Cyclone Outlook for Coral Sea Issued at 1:23 pm EST on Sunday 12 December 2021 for the period until midnight EST Wednesday 15 December 2021". Australian Bureau of Meteorology. 12 December 2021. Archived from the original on 12 December 2021. Retrieved 12 December 2021.
  18. ^ "Strong Wind Warning Issued". Solomon Islands Times. 8 December 2021. Archived from the original on 8 December 2021. Retrieved 10 December 2021.
  19. ^ "Warning of More Heavy Rain and Possible Flooding". Solomon Islands Times. 8 December 2021. Archived from the original on 8 December 2021. Retrieved 10 December 2021.
  20. ^ "Warning of More Heavy Rain and Possible Flooding". Solomon Islands Times. 8 December 2021. Retrieved 10 December 2021.
  21. ^ John Follet (8 December 2021). "Residents' advice to boil water". Solomon Star. Archived from the original on 11 December 2021. Retrieved 10 December 2021.
  22. ^ "Kongulai Water Source Restored, Kombito Remains Closed". Solomon Islands Times. 10 December 2021. Archived from the original on 11 December 2021. Retrieved 11 December 2021.
  23. ^ "Météo : une dépression tropicale se rapproche petit à petit des côtes calédoniennes" [Weather forecast: a tropical depression is gradually approaching the Caledonian coast]. Nouvelle-Calédonie la 1ère (in French). 11 December 2021. Retrieved 11 December 2021.{{cite web}}: CS1 maint: url-status (link)
  24. ^ "Météo : préalerte cyclonique annoncée pour dimanche matin" [Weather forecast: cyclonic early warning announced for Sunday morning]. Nouvelle-Calédonie la 1ère (in French). Retrieved 11 December 2021.{{cite web}}: CS1 maint: url-status (link)
  25. ^ "Désormais nommée Ruby, la dépression tropicale passe de faible à modérée" [Now named Ruby, the tropical depression goes from low to moderate]. Nouvelle-Calédonie la 1ère (in French). Retrieved 12 December 2021.{{cite web}}: CS1 maint: url-status (link)
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