The SummaryTyphoon Sonca (international code 201708) is a 2017 Northwest Pacific typhoon; peak intensity Tropical Storm, max wind 23m/s, minimum central pressure 990hPa, at 2017-07-25 16:30LandfallVietnam广平 Province, 2017-07-25 was numbered off, 全程记录83 track points.
Typhoon Sonca, international code 201708, international name SONCA, 2017 Northwest Pacific typhoon. Formed: 2017-07-21 17:00:00, ended: 2017-07-25 23:00:00. Peak intensity: Tropical Storm, minimum central pressure: 990 hPa, max wind: 23m/s.
Typhoon Sonca at 2017-07-21 17:00:00 at 17.7°N, 113.7°E over the Northwest Pacific; initial intensity: Nameless.
It peaked at Tropical Storm intensity with max winds of 23 m/s (~83 km/h) and a minimum central pressure of 990hPa, recorded at 2017-07-25 05:00:00.
2017-07-25 16:30:00, Typhoon Sonca in Vietnam Square Province Landfall.
2017-07-25 23:00:00 After, Typhoon Sonca gradually weakened and was numbered off on 2017-07-25 23:00:00 was numbered off; its lifecycle recorded 83 track points.
From the formed initial coordinates (17.7°N, 113.7°E) to the final observation point before the Landfall, its latitude varies very little, essentiallyined in the narrow strip area of 17.0°N to 17.7°N, indicating the steering flow stability, lack of obvious SN toward swing. In the longitudinal direction, the system continued toward W advancing, from lng 113.7° to 106.4°, across the Sea W area. It is worth noting that during July 22 to 23, the Typhoon center moved from 112.1°E slowly to 111.4°E, Moving speed is relatively slow; and in July 24th, with the approach to Vietnamcoastal, the movement speed has accelerated, and has not been accelerated through the equalization of the year to the entire line of the landfall,
In terms of intensity evolution, “Sonca” showed the characteristics of slow enhancement, peak maintenance, rapid weakening after Landfall. The initial phase was Nameless (12m/s, 1005hPa) , then gradually strengthened. on the evening of July 22 to Tropical Storm, and for the following three days (from July 23 to 24 most of Time) Intensity remained stable, wind speedined at 18m/s, air pressure stable at 998hPa. Until the morning of July 25, the system reached peak intensity, max wind increased to 23m/s, minimum pressure dropped to 990hPa.
Its peak intensity is only at Tropical Storm level, minimum pressure is 990hPa. In comparison, 2011's 16th 'Sonca' has reached Typhoon level (975hPa) and 2005's 3rd 'Sonca' has reached Severe Typhoon level (950hPa) . Even compared to 2022's 19th 'Sonca', 2017's version is slightly lower at the minimum air pressure of 2hPa (990hPa vs 998hPa), but both belong at Tropical Storm level.
| Time | The latitude | During | Intensity | Wind (m/s) | Pressure (hPa) | Moving toward |
|---|---|---|---|---|---|---|
| 2017-07-21 17:00:00 | 17.7°N | 113.7°E | Nameless | 12 | 1005 | NW |
| 2017-07-22 05:00:00 | 17.9°N | 112.7°E | Nameless | 12 | 1005 | NNW |
| 2017-07-22 17:00:00 | 17.7°N | 111.8°E | Tropical Storm | 18 | 998 | WNW |
| 2017-07-22 21:00:00 | 17.7°N | 111.6°E | Tropical Storm | 18 | 998 | NNW |
| 2017-07-23 01:00:00 | 17.7°N | 111.6°E | Tropical Storm | 18 | 998 | NNW |
| 2017-07-23 05:00:00 | 17.7°N | 111.4°E | Tropical Storm | 18 | 998 | SSW |
| 2017-07-23 09:00:00 | 17.6°N | 111.4°E | Tropical Storm | 18 | 998 | SW |
| 2017-07-23 13:00:00 | 17.6°N | 111.4°E | Tropical Storm | 18 | 998 | SW |
| 2017-07-23 17:00:00 | 17.5°N | 111.5°E | Tropical Storm | 18 | 998 | NNW |
| 2017-07-23 21:00:00 | 17.4°N | 111.5°E | Tropical Storm | 18 | 998 | - |
| 2017-07-24 01:00:00 | 17.2°N | 111.5°E | Tropical Storm | 18 | 998 | - |
| 2017-07-24 05:00:00 | 17.3°N | 111.4°E | Tropical Storm | 18 | 998 | NWW |
| 2017-07-24 09:00:00 | 17.3°N | 111.2°E | Tropical Storm | 18 | 998 | NWW |
| 2017-07-24 13:00:00 | 17.4°N | 111°E | Tropical Storm | 18 | 998 | NWW |
| 2017-07-24 17:00:00 | 17.4°N | 110.8°E | Tropical Storm | 20 | 995 | NWW |
| 2017-07-24 21:00:00 | 17.4°N | 110°E | Tropical Storm | 20 | 995 | NW |
| 2017-07-25 01:00:00 | 17.2°N | 109.7°E | Tropical Storm | 20 | 995 | NWW |
| 2017-07-25 05:00:00 | 17.3°N | 109.1°E | Tropical Storm | 23 | 990 | W |
| 2017-07-25 09:00:00 | 17.2°N | 108.4°E | Tropical Storm | 23 | 990 | W |
| 2017-07-25 13:00:00 | 17.1°N | 107.7°E | Tropical Storm | 23 | 990 | W |
| 2017-07-25 17:00:00 | 17.1°N | 107°E | Tropical Storm | 20 | 996 | W |
| 2017-07-25 23:00:00 | 16.9°N | 106.4°E | Nameless | 16 | 1002 | W |
Sampled rows shown; all 83 track points are available on the interactive map or via the public API .
The international code for Typhoon Sonca is 201708, which is the 8th Typhoon of 2017, the international name SONCA.
Typhoon Sonca peak intensity is Tropical Storm, max wind 23m/s, minimum central pressure 990 hPa.
2017-07-25 16:30:00 in Vietnam Square Province Landfall.
TyphoonSays (taifengshuo.com) provides typhoon Sonca's Track history map, multinational meteorological agency Forecast comparison, wind range with IntensityTrend, page address: https://taifengshuo.com/typhoon/201708.
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