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Tropical Storm Dujuan (2021)

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This article is about the 2021 tropical storm. For other storms of the same name, see List of storms named Dujuan and List of storms named Auring.
Tropical Storm Dujuan (Auring)
Dujuan at peak intensity over the Philippine Sea on February 19
Meteorological history
FormedFebruary 16, 2021
DissipatedFebruary 23, 2021
Tropical storm
10-minute sustained (JMA)
Highest winds75 km/h (45 mph)
Lowest pressure996 hPa (mbar); 29.41 inHg
Tropical storm
1-minute sustained (SSHWS/JTWC)
Highest winds85 km/h (50 mph)
Lowest pressure991 hPa (mbar); 29.26 inHg
Overall effects
Fatalities1
Missing4
Damage$3.29 million (2021 USD)
Areas affectedPalau, Philippines
IBTrACSEdit this at Wikidata
Part of the 2021 Pacific typhoon season

Tropical Storm Dujuan, known in the Philippines as Severe Tropical Storm Auring, was a tropical storm which caused heavy rain in the Philippines and Palau, leading to minor damage. Dujuan was the second depression and first named storm of the 2021 Pacific typhoon season. Dujuan started as a tropical depression in the Philippine Sea which slowly tracked northwestward towards the Philippines. Its strength fluctuated from February 19 to 21 due to an unfavorable environment near the storm at the time. The system was declared a tropical storm prior to its landfall in Batag Island, Laoang, Northern Samar on February 22.

Dujuan caused no casualties in Palau. In the Philippines, however, the storm caused 1 death and left 4 missing. The storm also caused a fishing vessel to capsize, leaving 15 Filipino fisherman adrift for six days before being rescued. Floodwater inundated houses in Surigao del Sur, submerging Tandag City along with 3,168 hectares of cropland. Total damages in the Philippines amounted to at least $3.29 million (2021 USD).

Meteorological history

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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 February 16 at 06:00 UTC, the Japan Meteorological Agency (JMA) reported that a tropical depression had developed over the Philippine Sea.[1] Eight hours later, the JTWC issued a Tropical Cyclone Formation Alert (TCFA) on the system, while it was located roughly 15 miles (24 km) to the east of Babeldaob, Palau. The depression displayed convective banding features, wrapping into a disorganized low-level center of circulation. Within an area favorable for further development, with low to moderate vertical wind shear, strong poleward outflow, and 29–30 °C (84–86 °F) sea surface temperatures, the system began to intensify.[2] By 3:00 UTC on February 17, the depression had entered the Philippine Area of Responsibility (PAR), and was given the name Auring by the PAGASA. This made Dujuan the first named storm within the PAR in 2021.[3] Three hours later, the JTWC upgraded the system to a tropical depression, giving it the designation 01W.[4] As the system tracked to the west-northwest, it continued to strengthen until the early hours of February 18, when it was upgraded to a tropical storm by the JMA, JTWC, and the PAGASA,[4][5][6] with the JMA giving it the name Dujuan.[1]

At 03:00 UTC on February 19, the PAGASA briefly upgraded Dujuan into a severe tropical storm, before downgrading it back.[7][8] The next day, vertical wind shear in Dujuan's environment had decreased, allowing the storm to slightly re-strengthen.[9] The vertical wind shear associated with the northeast monsoon still persisted, affecting the system,[10] and on February 21, the JMA downgraded Dujuan to a tropical depression.[1] The JTWC and the PAGASA followed on the next day as the system's low-level circulation center (LLCC) had weakened prior to landfall.[4][11] The JMA and the JTWC issued their final advisories moments after.[12][13] The storm made landfall over Batag Island in Laoang, Northern Samar at 09:00 PHT (01:00 UTC) on the same day.[14] Prior to crossing the Rapu-Rapu Islands in Albay, the PAGASA declared the storm as a low-pressure area and issued their final bulletin on the storm.[15] Dujuan dissipated on February 23 at 06:00 UTC.[1]

Preparations and impact

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Overcast skies and rain puddles associated with Dujuan in Bocaue on February 21

Dujuan briefly moved over Palau on February 16 as a tropical depression, bringing heavy rainfall to parts of the country.[16][17] On February 18, the boat of 15 Filipino fishermen capsized off the coast of Surigao, leaving the group adrift for six days until they were rescued by the Philippine Coast Guard.[18][19]

In anticipation of the storm, the PAGASA issued Signal #1 warnings for the eastern section of Mindanao on February 19, with the same warnings issued on the eastern provinces of Visayas.[20][21][22] Signal 2 warnings were also issued in the majority of Eastern Samar, Samar, Southern Leyte, Dinagat Islands, and Surigao del Norte on February 21 as Dujuan re-intensified hours before landfall.[23] The warnings were quickly lowered, however, just a few hours after being issued.[24] Despite the lowered warnings, the storm was able to cause flooding in parts of Visayas. Before the storm's landfall, in Tandag City, Surigao del Sur, heavy rains had already caused houses to be submerged in floodwater.[25] Classes and government work was suspended on February 22 in Romblon, Tacloban City, and Negros Oriental and in parts of Leyte, Cebu, Davao de Oro, and Surigao del Sur.[26][27]

A total of 280,881 individuals were affected in Northern Mindanao, Caraga, and in the Davao Region. At least 183,226 of the affected individuals were taken to 950 various evacuation shelters in each region. 2,408 houses were damaged, with 444 houses becoming totally damaged. Most of the damage occurred in the Caraga Administrative Region.[28] 42 domestic flights and multiple sea trips were also cancelled due to the harsh weather.[29] An analysis by the STAMINA4Space Program revealed that over 3,412 hectares of land had been inundated due to floods from Dujuan, with 92% (3,168 ha) of the land being cropland. The cropland only contained sparse vegetation at the time, however.[30] In the Philippines, one person was reported dead with four others reported missing.[31] Agricultural damages stood at ₱79.4 million while infrastructural damages stood at ₱23.6 million, for a total of ₱103 million (US$3.29 million).[32] Aon estimates that total losses in the Philippines reached at least $10 million (2021 USD).[33]

See also

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References

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  1. ^ a b c d "RSMC Tropical Cyclone Best Track Name 2101 Dujuan (2101)". Japan Meteorological Agency. May 20, 2021. Archived from the original on May 28, 2021. Retrieved March 27, 2022 – via the National Oceanic and Atmospheric Administration.
  2. ^ "Tropical Cyclone Formation Alert (Invest 91W)". Joint Typhoon Warning Center. February 16, 2021. Archived from the original on February 16, 2021. Retrieved February 16, 2021.
  3. ^ "Severe Weather Bulletin #1 for Tropical Depression 'Auring'" (PDF). PAGASA. 17 February 2021. Archived from the original (PDF) on 22 April 2021. Retrieved 17 February 2021. Alt URL
  4. ^ a b c "bwp012021.dat". Joint Typhoon Warning Center. Retrieved March 27, 2022 – via National Oceanic and Atmospheric Administration.
  5. ^ Tropical Storm 01W (One) Warning No. 4 (Report). United States Joint Typhoon Warning Center. 18 February 2021. Archived from the original on 2021-02-18. Retrieved 18 February 2021. Alt URL
  6. ^ "Severe Weather Bulletin #3 for Tropical Storm 'Auring'" (PDF). PAGASA. 18 February 2021. Archived from the original (PDF) on 22 April 2021. Retrieved 18 February 2021. Alt URL
  7. ^ "Severe Weather Bulletin #6 for Severe Tropical Storm 'Auring' (Dujuan)" (PDF). PAGASA. 19 February 2021. Retrieved 19 February 2021.[dead link‍] Alt URL
  8. ^ "Severe Weather Bulletin #7 for Tropical Storm 'Auring' (Dujuan)" (PDF). PAGASA. 19 February 2021. Archived from the original (PDF) on 22 April 2021. Retrieved 19 February 2021. Alt URL
  9. ^ Prognostic Reasoning for Tropical Storm 01W (Dujuan) Warning No. 17 (Report). United States Joint Typhoon Warning Center. 21 February 2021. Archived from the original on 2021-02-18. Retrieved 21 February 2021. Alt URL
  10. ^ "'Bagyong Auring' PAGASA weather update February 21, 2021". The Summit Express. February 21, 2021. Archived from the original on April 22, 2021. Retrieved April 8, 2021.
  11. ^ "Severe Weather Bulletin #19 for Tropical Depression 'Auring' (Dujuan)" (PDF). PAGASA. 21 February 2021. Retrieved 21 February 2021.[dead link‍] Alt URL
  12. ^ "Tropical Cyclone Information". Japan Meteorological Agency. February 22, 2021. Archived from the original on February 22, 2021. Retrieved February 22, 2021.
  13. ^ Tropical Depression 01W (Dujuan) Warning No. 20 (Report). United States Joint Typhoon Warning Center. 22 February 2021. Retrieved 22 February 2021.[dead link‍] Alt URL
  14. ^ "Severe Weather Bulletin #23 for Tropical Depression 'Auring' (Dujuan)" (PDF). PAGASA. 22 February 2021. Retrieved 22 February 2021.[dead link‍] Alt URL
  15. ^ "Severe Weather Bulletin #24 for Low Pressure Area (formerly 'Auring') {Dujuan}" (PDF). PAGASA. 22 February 2021. Retrieved 22 February 2021.[dead link‍] Alt URL
  16. ^ "WEATHER ROUNDUP FOR THE MARIANAS AND MICRONESIA". National Weather Service Tiyan GU. February 16, 2021. Archived from the original on February 16, 2021. Retrieved February 16, 2021.
  17. ^ "Tropical Cyclone Formation Alert Graphic". Joint Typhoon Warning Center. February 16, 2021. Archived from the original on February 16, 2021. Retrieved February 16, 2021.
  18. ^ Gubalani, Richelyn (February 26, 2021). "Fishing vessel rescues 15 Surigao fishers off Palau". Philippine News Agency. Archived from the original on February 27, 2021. Retrieved February 27, 2021.
  19. ^ Ramos, Christia Marie (February 26, 2021). "15 fishers of boat that capsized during Auring's onslaught rescued". INQUIRER.net. Archived from the original on February 26, 2021. Retrieved February 27, 2021.
  20. ^ "Severe Weather Bulletin #5 for Tropical Storm 'Auring' (Dujuan)" (PDF). PAGASA. 19 February 2021. Retrieved 19 February 2021.[dead link‍] Alt URL
  21. ^ "Storm Signal No. 1 up in four Mindanao areas as Auring remains stationary over Philippine Sea". CNN Philippines. February 19, 2021. Archived from the original on February 18, 2021. Retrieved February 19, 2021.
  22. ^ "Severe Weather Bulletin #7 for Tropical Storm 'Auring' (Dujuan)" (PDF). PAGASA. 19 February 2021. Retrieved 19 February 2021.[dead link‍] Alt URL
  23. ^ "Severe Weather Bulletin #18 for Tropical Storm 'Auring' (Dujuan)" (PDF). PAGASA. 21 February 2021. Retrieved 21 February 2021.[dead link‍] Alt URL
  24. ^ "Severe Weather Bulletin #19 for Tropical Storm 'Auring' (Dujuan)" (PDF). PAGASA. 21 February 2021. Retrieved 21 February 2021.[dead link‍] Alt URL
  25. ^ "IN PHOTOS: Surigao del Sur flooded due to Tropical Storm Auring". Rappler. February 21, 2021. Archived from the original on February 21, 2021. Retrieved February 21, 2022.
  26. ^ "Walang Pasok: Class, work suspensions on February 22 due to 'Auring'". Philstar.com. February 22, 2021. Archived from the original on February 22, 2021. Retrieved February 22, 2021.
  27. ^ "Sitrep No. 04 re Preparedness Measures and Effects of Severe Tropical Storm "AURING"" (PDF). National Disaster Risk Reduction and Management Council. February 22, 2021. Archived (PDF) from the original on February 23, 2021. Retrieved February 23, 2021.
  28. ^ Rafanan, Marie Joyce G. (April 19, 2021). DSWD DROMIC Terminal Report on Severe Tropical Storm "AURING" (Report). Department of Social Welfare and Development Disaster Response Operations Monitoring and Information Center. Archived from the original on July 10, 2021. Retrieved July 10, 2021.
  29. ^ "Sitrep No. 05 re Preparedness Measures and Effects of Severe Tropical Storm "AURING"" (PDF). National Disaster Risk Reduction and Management Council. February 22, 2021. Archived (PDF) from the original on February 23, 2021. Retrieved February 23, 2021.
  30. ^ "STS Auring affects Surigao del Sur farmers, satellite images show". STAMINA4Space. February 26, 2021. Archived from the original on February 27, 2021. Retrieved February 27, 2021.
  31. ^ "Auring leaves 1 dead, 2 missing in Caraga". CNN Philippines. February 23, 2021. Archived from the original on February 23, 2021. Retrieved February 23, 2021.
  32. ^ "SitRep no.09 re Preparedness Measures and Effects for STS Auring" (PDF). NDRRMC. February 27, 2021. Archived (PDF) from the original on April 13, 2021. Retrieved February 27, 2021.
  33. ^ "Global Catastrophe Recap February 2021" (PDF). AON. Archived (PDF) from the original on March 18, 2021. Retrieved March 12, 2021.
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