Tropical Storm Sonca
Sonca nearing landfall on July 25
Meteorological history
FormedJuly 21, 2017
DissipatedJuly 29, 2017
Tropical storm
10-minute sustained (JMA)
Highest winds65 km/h (40 mph)
Lowest pressure994 hPa (mbar); 29.35 inHg
Tropical storm
1-minute sustained (SSHWS/JTWC)
Highest winds85 km/h (50 mph)
Lowest pressure989 hPa (mbar); 29.21 inHg
Overall effects
Fatalities37 total
Damage$313 million (2017 USD)
Areas affectedHainan, Vietnam, Cambodia, Laos, Thailand (particularly Northeast Thailand), Myanmar
IBTrACS
Part of the 2017 Pacific typhoon season

Tropical Storm Sonca was a weak tropical cyclone that impacted Indochina during the end of July 2017.

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

On July 21, both the JMA and the JTWC reported that Tropical Depression 08W had developed approximately 582 km (361 mi) to the south of Hong Kong.[1][2] After moving westward for a couple of days, the system strengthened into a tropical storm by both agencies while nearing the island province of Hainan, receiving the name Sonca.[3] By July 24, Sonca reached its maximum intensity with a minimum pressure of 994 hPa.[4] Early on July 25, the JTWC issued its final advisory as the system made landfall over in Quảng Trị Province, Vietnam.[5][6] The JMA issued its final advisory a few hours later until it weakened into an area of low-pressure.

Preparations and impact

Vietnam

At least six people were killed when the storm made landfall on July 25, all in the provinces of Hà Tĩnh and Quảng Trị. Also, about 1,500 houses were damaged in these two provinces. Across the whole of Vietnam, roughly 5,777 hectares (14,280 acres) of paddy field and 750 hectares (1,900 acres) of croplands were damaged.[7] In Nghe An Province total dâmge by the storm reached 127 billion dong (US$5.6 million).[8] Total damage in Vietnam reached 300.7 billion dong (US$13 million).[9]

Cambodia

Tropical Storm Sonca affected four provinces across Cambodia, at least three people died and 2686 houses were submerged. 53 households were affected and only 23 were evacuated.[10]

Thailand

Flash floods across Thailand killed 23 people and affected 44 out of 76 provinces in Thailand. The hardest hit province was Sakon Nakhon, Northeast Thailand as the storm forced the closer of Sakon Nakhon Airport lasting for 3 days.[10] Damages in Sakon Nakhon exceeded 100 million baht (US$3 million).[11] Some say that Northeast Thailand has had its worst flooding in two decades.[12]

Heavy rain damaged bridges in Khon Kaen province and flooded buildings in Ubon Ratchathani province and Sisaket province, where some people were relocated to temporary accommodations. In Lopburi province, some people were rescued by boat after the roads became impassable. In Sukhothai province, the Yom River flooded, and sandbags were used to help contain the floodwaters. Trains had to be re-routed in Nong Khai province when telephone poles fell on the tracks.[13]

In total, the damage from flooding triggered by the storm in Thailand reached 10 billion baht (US$300 million).[14]

See also

References

  1. ↑ "Marine Weather Warning for GMDSS Metarea XI 2017-07-21T06:00:00Z". WIS Portal – GISC Tokyo. Japan Meteorological Agency. Retrieved July 21, 2017.
  2. ↑ "Tropical Depression 08W (Eight) Warning Nr 001". Joint Typhoon Warning Center. July 21, 2017. Archived from the original on July 21, 2017.
  3. ↑ "Tropical Storm 08W (Eight) Warning Nr 009". Joint Typhoon Warning Center. July 23, 2017. Archived from the original on July 23, 2017.
  4. ↑ "Tropical Storm 08W (Sonca) Warning Nr 016". Joint Typhoon Warning Center. July 24, 2017. Archived from the original on July 25, 2017.
  5. ↑ "Tropical Storm 08W (Sonca) Warning Nr 018". Joint Typhoon Warning Center. July 25, 2017. Archived from the original on July 25, 2017.
  6. ↑ "VIDEO Cập nhật bão số 4: Đổ bộ vào Quảng Trị và gây mưa lớn | TTVH Online". thethaovanhoa.vn. 25 July 2017. Retrieved August 5, 2017.
  7. ↑ "Viet Nam, the Impact of Tropical Storm "Sonca" - Viet Nam". 31 July 2017.
  8. ↑ "Nghệ an: Bão số 4 gây thiệt hại trên 127 tỷ đồng".
  9. ↑ http://phongchongthientai.mard.gov.vn/FileUpload/2019-08/u4fxaVGl-kKJ8YgF2017-00.%20THIET%20HAI%20NAM%202017_tinh,%20tp_ngay%2031.12.2017.pdf
  10. 1 2 "AHA Centre Flash Update: Flooding, Cambodia, Lao PDR, Myanmar & Thailand. - Myanmar". ReliefWeb. 2 August 2017. Retrieved August 5, 2017.
  11. ↑ "Sakon Nakhon flood damage estimated at over Bt100 million". nationmultimedia.com. Archived from the original on September 3, 2017. Retrieved August 5, 2017.
  12. ↑ "King urges quick relief after floods". Bangkok Post.
  13. ↑ "Flooding worsens as Sonca influence intensifies - Pattaya Mail". Archived from the original on 2017-08-13. Retrieved 2017-08-14.
  14. ↑ "Thailand floods kill 23, cause damage estimated at $300 million". Reuters. 3 August 2017.
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