Typhoon Nock-ten

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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

On December 20, the Japan Meteorological Agency started to monitor a tropical depression that had formed about 1,090 km (675 mi) to the southeast of Yap Island in the Federated States of Micronesia. [4] [5] The broad and poorly organized system was being affected by moderate to high vertical wind shear, which was being offset by warm sea surface temperatures. [5] Soon, the JTWC upgraded the system to a tropical depression, with the designation of 30W, based on improved environmental conditions and an ASCAT image. [6] Late on the same day, when central convection was increasing and consolidating over a defined low-level circulation center (LLCC), both the JMA and the JTWC upgraded it to a tropical storm, with the former assigning the name Nock-ten. [7] [8] One day later, late on December 22, the JMA upgraded the system to a severe tropical storm, and Nock-ten started to form an eye revealed by microwave imagery. [9] [10]

Tracking west-northwestward and then westward along the southern periphery of a deep-layered subtropical ridge, Nock-ten intensified into a typhoon at noon UTC on December 23. [11] [12] Immediately after that, explosive intensification commenced with a sharp eye embedded in a symmetric central dense overcast feature. [13] At 06:00 UTC on December 24, Nock-ten reached its peak intensity with estimated ten-minute maximum sustained winds of 195 km/h (120 mph) and the central pressure at 915 hPa (27.02 inHg); therefore, it was the latest-forming typhoon of such intensity or stronger on record. [14] The JTWC also upgraded Nock-ten to a Category 4-equivalent super typhoon, when the system was in an area of low vertical wind shear, excellent dual-channel outflow, and sea surface temperatures of 29 °C. [15] Although the eye became cloud-filled in the afternoon, it cleared again late on the same day and while the JMA did not raise its intensity estimate further, the JTWC did so. [16] [17]

On December 25, the JTWC reported that the Dvorak technique analyses at 03:00 UTC from "all reporting agencies" indicated a T-number of 7.0; [18] therefore, the JTWC added a non-synoptic entry to the operational best track for that time, indicating one-minute maximum sustained winds of 260 km/h (160 mph), equivalent to Category 5 on the Saffir–Simpson scale. [19] However, land interaction soon impacted the typhoon, as its convective cloud tops had become warmer. [18] Later, Nock-ten made landfall over the Philippines eight times: Bato, Catanduanes at 18:30 PST (10:30 UTC) and Sagñay, Camarines Sur at 21:30 PST (13:30 UTC) on December 25; San Andres, Quezon at 02:00 PST (18:00 UTC), Torrijos, Marinduque at 04:30 PST (20:30 UTC), Verde Island, Batangas at 09:15 PST (01:15 UTC), Tingloy, Batangas at 10:10 PST (02:10 UTC), Calatagan, Batangas at 11:40 PST (03:40 UTC), and Lubang Island, Occidental Mindoro at 13:00 PST (05:00 UTC) on December 26. [20]

The eight landfalls significantly eroded Nock-ten, and the structure became much more asymmetric and ragged. [21] Thus, when Nock-ten emerged into the South China Sea early on December 26, it had weakened into a minimal typhoon. [22] Subsequently, although Nock-ten's structure briefly improved, it was downgraded to a severe tropical storm by the JMA and a tropical storm by the JTWC early on December 27, as its LLCC had started to become exposed. [23] [24] Poleward outflow was no longer offsetting the effects of strong vertical wind shear, leading to rapid weakening. [25] After the JMA downgraded the system to a tropical storm at 09:00 UTC, Nock-ten further weakened to a tropical depression late on the same day. [26] [27] Influenced by a Northeast Monsoon surge, the system accelerated southwestward, and convection was unable to develop over the fully exposed LLCC due to high vertical wind shear and colder dry air. [28] The JTWC issued its final warning for the system early on December 28, and the tropical depression dissipated in the afternoon. [29] [30] [31]

Preparations and impact

Highest PSWS raised by PAGASA across the Philippines in relation to Typhoon Nina (Nock-Ten) Nina PSWS.png
Highest PSWS raised by PAGASA across the Philippines in relation to Typhoon Nina (Nock-Ten)

Nock-ten made eight landfalls in the Philippines. [32] According to the NDRRMC, a total of 98,771 families were preemptively evacuated in CALABARZON, MIMAROPA, Bicol, and Eastern Visayas region. [33]

A total of 13 people have been reported dead while total damages have been reported up to 6.12 billion (US$123 million). [34]

On December 26, 2016, MV Starlite Atlantic sank off the coast of Tingloy, Batangas during the onslaught of the typhoon. The vessel was anchored in Batangas Bay when the typhoon passed over it with winds of up to 185 km/h in the center and gusts of 215 km/h. The typhoon generated huge waves between six and eight meters in height, causing the vessel to come off its mooring and drift toward Tingloy where it sank. One person died and 18 were reported missing in the incident, while the Philippine Coast Guard rescued 15 out of the 34 crew. [35] [36] [37]

Highest Public Storm Warning Signal

Typhoon Nock-ten (Nina)
Nock-ten 2016-12-25 0210Z (gallery).jpg
Nock-ten approaching the Philippines at peak intensity on Christmas Day
PSWS#LuzonVisayasMindanao
4Camarines Norte, Camarines Sur, Catanduanes, Southern Portion of QuezonNoneNone
3Albay, Burias Island, Marinduque, Batangas, Lubang Island, Cavite, Laguna, Northern Portion of Oriental Mindoro, Northern Portion of Occidental Mindoro, Rest of Quezon, Sorsogon, Southern Portion of Metro ManilaNoneNone
2Rizal, Bulacan, Bataan, Pampanga, Southern Portion of Zambales, Polillo Islands, Rest of Occidental Mindoro, Rest of Oriental Mindoro, Romblon, Masbate including Ticao Island, Rest of Metro ManilaNorthern SamarNone
1Rest of Zambales, Tarlac, Nueva Ecija, Nueva Vizcaya, Quirino, Aurora, Pangasinan, Calamian Group of IslandsSamar, Eastern Samar, Biliran, Leyte, Rest of Cebu, Aklan, CapizNone

Retirement

Aerial photo shows the damage of Typhoon Nina to the communities of Camarines Sur. PH10-122716 FRIAS2-1.jpg
Aerial photo shows the damage of Typhoon Nina to the communities of Camarines Sur.

PAGASA announced that Nina had removed from their naming lists, because it had caused over ₱1 billion in damages; subsequently on January 17, 2017, PAGASA announced that they selected Nika to supersede Nina for the 2020 season.

On the other hand, during the 49th annual session of the ESCAP/WMO Typhoon Committee during 2017, they announced that the Nock-ten had also removed from the naming lists. In March 2018, the Typhoon Committee officially chose Hinnamnor as its replacement name. But the name Hinnamnor was also retired after the 2022 season and was replaced by Ong-mang. [38]

See also

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