Tropical Storm Koguma

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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
Disc Plain black.svg Tropical cyclone
Solid black.svg Subtropical cyclone
ArrowUp.svg Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

At 8:30 UTC on June 10, the Joint Typhoon Warning Center (JTWC) [nb 1] started to monitor a low-pressure area in the South China Sea, located approximately 518 km (322 mi) to the south of Hong Kong, with the agency classifying the system as a monsoon depression as it was embedded within a monsoon trough that extends from Laos to the Philippines. [2] [3] [4] Tracking west-northwestward, the storm was located in a favorable environment for tropical cyclogenesis, with warm sea surface temperatures up to 30–31 °C (86–88 °F) and low wind shear, being offset by the lack of divergence aloft in the area. [5] At 06:00 UTC on June 11, the Japan Meteorological Agency (JMA) [nb 2] upgraded the system into a tropical depression in its first advisory. [6] [7] An anticyclone over China started to move eastward at this time, increasing the divergent flow on the area which allowed slight intensification of the system. [2] The JTWC issued a Tropical Cyclone Formation Alert (TCFA) for the system, six hours later despite remaining disorganized on satellite imagery. [8] At 03:00 UTC on June 12, the JTWC upgraded the system into a tropical depression, assigning it the designation 05W. [9] At this time, the system passed over southern Hainan Island, into an area of moderate wind shear, which hampered the system's intensification. [10] [11] Three hours later at 06:00 UTC, the JMA assessed the system to had strengthened to a tropical storm, being assigned the name Koguma. [12] Six hours later, the JTWC upgraded the system to the same intensity as well as it entered the Gulf of Tonkin. [10] Remaining weak, Koguma moved northwestward and subsequently made landfall over north-central Thanh Hóa at 18:00 UTC on the same day, at peak intensity with winds of 65 km/h (40 mph) and a barometric pressure of 996 mbar. [13] The JTWC issued their final warning on the weakening system shortly afterward. [14] At 15:45 UTC on June 13, the JMA also issued the final warning on Koguma as it weakened further to a tropical depression and subsequently dissipated over the terrains of Vietnam. [15]

Preparations

Vietnam

As Koguma approached Vietnam from the Gulf of Tonkin, the city of Thái Bình ordered the suspension of fishing activities in the area due to the forecasted rough waters from the storm. [16] Many farmers in the place also hurried to harvest the spring rice crops to prevent them from being destroyed and flooded. [16] The People's Committee of the city, on the other hand, urged the individuals in the area to cut the trees that would disrupt major roadways and put support on their houses, warehouses, schools, hospitals, aquaculture and fishing farms to prevent any damages. [16] Evacuations in the area and its nearby cities and provinces were also ordered. [16] Moderate to heavy rainfall were also expected in the northern portions of the country, with 50-120 mm (2 - 4 in) of rain being forecasted in these areas, including Hanoi. [17] [18] [19] In addition, the country's capital also prepared a flood response plan inland and informed 54,673 vehicles in the sea of possible impacts from Koguma. [20]

Elsewhere

At 13:00 UTC on June 11, the Hong Kong Observatory in Hong Kong issued a Signal Number 1 in the region due to Koguma, which was subsequently cancelled on 16:30 UTC, the next day. [21] The Ministry of Water Resources in Cambodia raised an alert warning on the country due to the possible effects of Koguma, being influenced by the prevailing southwest monsoon. [22] The ministry also advised fishermen across the country to be alerted of large waves, gusty winds, and prevalent thunderstorms. [22] Authorities in Laos informed the people in the country to be alert on floods caused by the prevailing monsoon and the remnants of Koguma. [23] The Thai Meteorological Department noted that moderate to heavy rainfall were expected across some places in Northern and Northeastern portions of Thailand due to the influence of the monsoon trough and the remnants of the system. [24] [25]

Impact

Vietnam

Koguma making landfall in Vietnam on June 12. 2021 CIMSS 05W Koguma visible infrared map.GIF
Koguma making landfall in Vietnam on June 12.

Koguma caused heavy downpours across northern Vietnam. [26] 321 mm (12.6 in) of rainfall were recorded at Dau Lieu, Hà Tĩnh Province on June 13, while an amount of 240 mm (9.4 in) were reported at Vinh, Nghệ An Province on the same day. [26]

A tornado swept through An Vu commune in the rural district of Quỳnh Phụ District on June 13, causing the roofs of some schools in the area to be blown away by strong winds. [27] These conditions also caused several trees in the district and in Haiphong to be uprooted while four power poles in the former had been reported to be depleted due to the storm. [27] In the latter, heavy rains from Koguma caused many rivers to nearly overflow. [16] [27] Initial impacts caused by the storm in An Vũ topped at 2.4 billion đồng (US$104,000). [27] 2 people in Thanh Hóa's coast were reported missing, [28] [29] while an individual was confirmed dead in Yên Bái Province on June 14 by the Vietnam Disaster Management Authority due to Koguma. A total of 143 houses throughout Vietnam were damaged. [30] Over 19,720 hectares of farmland were also submerged in floodwaters while 850 individuals throughout the country were affected due to the storm. [28]

Laos

Despite Koguma dissipating over Vietnam, the remnants of the storm reached Laos, causing numerous landslides and floods. [26] [31] Residences and farmlands were the worst impacted in Vientiane, Xayaboury, Xiangkhouang and Bokeo due to the storm, being influenced further by the monsoon. [26] [32] Houses in Pha Oudom District, located in Bokeo Province were reported to be washed away by the floodwaters while several landslides disrupted roadways in Xiengkhouang's Khoune District. [32] Local authorities in the country also issued warnings on individuals residing in different rivers across the country due to the rising water levels. [32] In addition, the Nam Houng River and Nam Song River overflowed on June 14, with the former flooding the ricefields near the watercourse. [32] Over 3,000 individuals in Sainyabuli, on the other hand, were affected by the floods. [23] [33] The damages in the country are still tallied as of June 16. [26] 5,300 public vehicles and 11 schools were reported to be damaged by the floods, while five bridges throughout the country were wrecked. [34] In addition, 25 roadways were impassable as they were destroyed; some of them were now repaired as of June 17. [34] An estimated 169 hectares of plowland were severely affected by the floods and an unknown number of poultry and cattle perished due to the storm. [34] No deaths were confirmed in the country and the damages in Xayaboury, the worst hit, stood at ₭94 billion (US$9.77 million). [34]

Notes

  1. ↑ The Joint Typhoon Warning Center is a joint United States Navy  – United States Air Force task force that issues tropical cyclone warnings for the western Pacific Ocean and other regions. [1]
  2. ↑ The Japan Meteorological Agency is the official Regional Specialized Meteorological Center for the western Pacific Ocean.

See also

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References

  1. ↑ "Joint Typhoon Warning Center Mission Statement". Joint Typhoon Warning Center. 2011. Archived from the original on July 26, 2007. Retrieved July 25, 2012.
  2. 1 2 Significant Tropical Weather Advisory for the Western and South Pacific Oceans Reissued 100830Z-110600Z June 2021 (Report). United States Joint Typhoon Warning Center. June 10, 2021. Archived from the original on June 10, 2021. Retrieved June 11, 2021.
  3. ↑ Mangosing, Frances (June 10, 2021). "Pagasa: Cloudy Thursday with isolated rain showers; LPA spotted off N. Luzon". Philippine Daily Inquirer . Archived from the original on June 11, 2021. Retrieved June 11, 2021. Meanwhile, a monsoon trough is affecting the entire country.
  4. ↑ Fronde, Neil (June 13, 2021). "Tropical storm Koguma brings heavy rain to North, Northeast". The Thaiger. Archived from the original on June 14, 2021. Retrieved June 14, 2021.
  5. ↑ Significant Tropical Weather Advisory for the Western and South Pacific Oceans 110600Z-120600Z June 2021 (Report). United States Joint Typhoon Warning Center. June 11, 2021. Archived from the original on June 11, 2021. Retrieved June 11, 2021.
  6. ↑ "WWJP27 RJTD 110000". Japan Meteorological Agency. June 11, 2021. Archived from the original on June 11, 2021. Retrieved June 11, 2021.
  7. ↑ "WTPQ50 RJTD 110600". Japan Meteorological Agency. June 11, 2021. Archived from the original on June 11, 2021. Retrieved June 11, 2021.
  8. ↑ Tropical Cyclone Formation Alert (Invest 92W) (Report). United States Joint Typhoon Warning Center. June 11, 2021. Archived from the original on June 11, 2021. Retrieved June 11, 2021.
  9. ↑ "Tropical Depression 05W (Five) Warning NR 001". Joint Typhoon Warning Center . June 12, 2021. Archived from the original on June 12, 2021. Retrieved June 12, 2021.
  10. 1 2 Anh, Phan; Dinh, Tat (June 12, 2021). "Storm Koguma to make landfall Sunday". VnExpress . Archived from the original on June 14, 2021. Retrieved June 14, 2021.
  11. ↑ Prognostic Reasoning for Tropical Depression 05W (Five) Warning NR 002 (Report). Pearl Harbor, Hawaii: Joint Typhoon Warning Center. June 12, 2021. Archived from the original on June 12, 2021. Retrieved June 12, 2021.
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  14. ↑ "Tropical Depression 05W (Koguma) Warning NR 004A". Joint Typhoon Warning Center. June 12, 2021. Archived from the original on June 13, 2021. Retrieved June 13, 2021.
  15. ↑ "Tropical Cyclone Information: Tropical Depression Koguma (Final Advisory)". Japan Meteorological Agency . June 13, 2021. Archived from the original on June 11, 2021.
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  17. ↑ "Storm Koguma weakens hours after hitting northern Vietnam". VnExpress. June 13, 2021. Archived from the original on June 16, 2021. Retrieved June 16, 2021.
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  22. 1 2 Sunly, Chhun (June 9, 2021). "Typhoon TS KOGUMA to hit Cambodia". Khmer Times. Archived from the original on June 16, 2021. Retrieved June 16, 2021.
  23. 1 2 "Over 3,000 people affected by floods in northern Laos". The Star. June 15, 2021. Archived from the original on June 16, 2021. Retrieved June 16, 2021.
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  27. 1 2 3 4 "Bão số 2 lướt qua gây thiệt hại tại Thái Bình, Hải Phòng". Vietnamnet (in Vietnamese). June 13, 2021. Archived from the original on June 13, 2021. Retrieved June 13, 2021.
  28. 1 2 "Vietnam - Tropical Storm KOGUMA (GDACS, AHA Centre, VDMA, NCHMF, FloodList) (ECHO Daily Flash of June 15, 2021)". ReliefWeb. European Commission's Directorate-General for European Civil Protection and Humanitarian Aid Operations. June 15, 2021. Archived from the original on June 15, 2021. Retrieved June 16, 2021.
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  30. ↑ "Thiệt hại do thiên tai từ đầu năm 2021 (tính đến 07h00 ngày June 17, 2021)". Vietnam Disaster Management Authority (in Vietnamese). June 17, 2021. Archived from the original on June 17, 2021. Retrieved June 17, 2021.
  31. ↑ Thanabouasy, Phayboune (June 14, 2021). "Laos Sees Widespread Flooding in Wake of Tropical Storm Koguma". The Laotian Times. Archived from the original on June 14, 2021. Retrieved June 16, 2021.
  32. 1 2 3 4 "Laos suffers widespread flooding in wake of tropical storm Koguma". The Star. June 14, 2021. Archived from the original on June 14, 2021. Retrieved June 16, 2021.
  33. ↑ "Over 3,000 people affected by floods in N. Laos". Xinhua. June 15, 2021. Archived from the original on June 15, 2021. Retrieved June 16, 2021.
  34. 1 2 3 4 Souliyong, Salinda (June 17, 2021). "Xayaboury in need of emergency relief as floodwaters recede". Vientiane Times . Archived from the original on June 24, 2021. Retrieved June 17, 2021.
Tropical Storm Koguma
Koguma 2021-06-12 0605Z.jpg
Tropical Storm Koguma at peak intensity over the Gulf of Tonkin on June 12
Tropical cyclones of the 2021 Pacific typhoon season
2021 Pacific typhoon season summary.png
TD
TD
TS
Dujuan
TD
TD
VITY
Surigae
TD
Crising
TS
Choi-wan
TD
TD
TS
Koguma
TY
Champi
TD
TD
TD
Emong
TD
08W
VSTY
In-fa
TY
Cempaka
TD
TD
TS
Nepartak
TD
TD
TD
TD
TD
TD
TD
TD
TD
12W
TS
Lupit
STS
Mirinae
STS
Nida
TS
Omais
TD
17W
STS
Conson
VITY
Chanthu
TD
TD
VITY
Mindulle
TS
Dianmu
TD
TD
TS
Lionrock
STS
Kompasu
TD
Nando
STS
Namtheun
TY
Malou
TD
26W
VSTY
Nyatoh
VITY
Rai
TD
29W
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