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Tropical Storm Etau (Tonyo)
Tropical storm (JMA scale)
Tropical storm (SSHWS)
Etau at peak intensity on November 9
FormedNovember 6
DissipatedNovember 10
Highest winds10-minute sustained: 85 km/h (50 mph)
1-minute sustained: 85 km/h (50 mph)
Lowest pressure992 hPa (mbar); 29.29 inHg
Fatalities3
Damage$34.8 million (2020 USD)
Areas affectedPhilippines, Vietnam
Part of the 2020 Pacific typhoon season

Tropical Storm Etau, known in the Philippines as Tropical Storm Tonyo, was a tropical cyclone that affected the Philippines and Vietnam in November 2020. The twenty-eighth tropical depression and twenty-first named storm of the 2020 Pacific typhoon season, it was one of many cyclones that contributed to a devastating series of floods in Central Vietnam.

Meteorological history

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Map plotting the storm's track and intensity, according to the Saffir–Simpson scale
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
triangle Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

On November 6 at 06:00 UTC, the Joint Typhoon Warning Center (JTWC) began monitoring an area of convection northeast of Palau, noting a broad low-level circulation and favorable conditions surrounding the system.[1] Later that day at 12:00 UTC, the Japan Meteorological Agency (JMA) assessed that the system became a tropical depression.[2] On the next day at 12:00 UTC, the PAGASA upgraded the system to a tropical depression, assigning it the local name Tonyo.[3] The JTWC issued a Tropical Cyclone Formation Alert for Tonyo three hours later despite the presence of 20–25-knot (35–45 km/h; 25–30 mph) wind shear.[4] Tonyo made landfall on Ticao Island at 13:00 UTC, Torrijos, Marinduque at 20:30 UTC, and at San Juan, Batangas at 00:00 UTC on November 8.[5] At 12:00 UTC, the JTWC upgraded Tonyo to a tropical depression, designating it as 24W.[6] The system began consolidating,[7] and at 18:00 UTC, both the JMA and the PAGASA upgraded it to a tropical storm, with the JMA assigning it the international name Etau.[2][8] Etau then left the Philippine Area of Responsibility at 20:00 UTC.[8]

On November 9 at 00:00 UTC, the JTWC upgraded Etau to a tropical storm.[6] Six hours later, the JMA assessed that Etau had peaked in intensity with ten-minute sustained winds of 85 km/h (50 mph) and a minimum central pressure of 992 hPa (29.29 inHg).[2]

Preparations and impact

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Philippines

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Floods occurred in Boac, Marinduque on November 7. 199 passengers and 87 ships were stranded in Oriental Mindoro.[9]

Vietnam

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Etau killed three people in Vietnam.[10]

See also

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References

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  1. ^ Significant Tropical Weather Advisory for the Western and South Pacific Oceans, 06Z 6 November 2020 (Report). United States Joint Typhoon Warning Center. November 6, 2020. Archived from the original on September 2, 2022. Retrieved July 15, 2022. Alt URL
  2. ^ a b c Annual Report on the Activities of the RSMC Tokyo - Typhoon Center 2020 (PDF) (Report). Japan Meteorological Agency. December 1, 2020. Retrieved July 15, 2022.
  3. ^ De Vera-Ruiz, Ellalyn (November 7, 2020). "Just in: Tonyo develops into tropical depression". Manila Bulletin. Retrieved July 15, 2022.
  4. ^ Tropical Cyclone Formation Alert (Invest 92W) (Report). United States Joint Typhoon Warning Center. November 7, 2020. Retrieved July 15, 2022.[dead link] Alt URL
  5. ^ "Tropical depression Tonyo hits land in Batangas, may strengthen ahead of exit". ABS-CBN. November 8, 2020. Retrieved July 17, 2022.
  6. ^ a b "2020 Western North Pacific Ocean Best Track Data". Joint Typhoon Warning Center. Retrieved July 15, 2022.
  7. ^ Prognostic Reasoning for Tropical Depression 24W (Twentyfour) Warning No. 1 (Report). United States Joint Typhoon Warning Center. November 8, 2020. Retrieved July 15, 2022.[dead link] Alt URL
  8. ^ a b Arceo, Acor (November 9, 2020). "Tonyo intensifies into tropical storm, leaves PAR; Ulysses maintains strength". Rappler. Retrieved July 15, 2022.
  9. ^ Sitrep No. 02 re Preparedness Measures and Effects for Tropical Storm "Tonyo" (I.N. Etau) (PDF) (Report). National Disaster Risk Reduction and Management Council. November 11, 2020. Retrieved July 15, 2022.
  10. ^ Tổng Hợp Thiệt Hại Do Thiên Tai Từ Đầu Năm 2020 Đến Nay (Report) (in Vietnamese). Vietnam Disaster Management Authority. November 2020. Retrieved July 15, 2022.