Storm history › West Pacific › 2017 season
Tropical Storm Sonca (2017)
Sonca was a tropical storm of the 2017 West Pacific season. It was tracked from July 20, 2017 to July 29, 2017, about 9 days, and covered 1,140 miles.
At its peak it had winds of 50 mph (85 km/h) and a lowest pressure of 989 mb.
Its closest pass to a major city was 44 miles from Huế, Vietnam.
- Peak wind
- 50 mph
- Lowest pressure
- 989 mb
- Strongest
- Tropical storm
- Duration
- 9 days
- Track length
- 1,140 mi
- Energy (ACE)
- 1.9
DepressionTropical stormCat 1Cat 2Cat 3Cat 4Cat 5
Closest pass to major cities
| City | Closest pass |
|---|---|
| Huế, Vietnam | 44 mi (71 km) |
| Vientiane, Laos | 66 mi (106 km) |
| Da Nang, Vietnam | 71 mi (115 km) |
| Sanya, China | 85 mi (137 km) |
| Wanning, China | 111 mi (178 km) |
| Vinh, Vietnam | 128 mi (206 km) |
| Qionghai, China | 132 mi (213 km) |
How it compares
- Peak winds: 1666th highest of 2,271 West Pacific storms on record, tied with Tropical Storm Etau (2026), Tropical Storm Krovanh (2026), Tropical Storm Lingling (2025) and 136 more.
- Lowest pressure: 1465th lowest of 2,047 West Pacific storms with a recorded pressure, tied with Tropical Storm Higos (2026), Tropical Storm Narra (2026), Tropical Storm Saudel (2026) and 16 more.
- Energy: 1% of the 2017 West Pacific season's ACE.