Typhoon Ulysses

Also known as: Typhoon Vamco · Vamco · Typhoon Ulysses 2020 · Typhoon Ulysses (Vamco)

Definition

Typhoon Ulysses — internationally Typhoon Vamco, the international name contributed by Vietnam after the Vàm Cỏ river, and recorded in the structured knowledge bases as the 2020 Pacific typhoon — was the November 2020 typhoon that formed east of the Philippines on November 8, entered the Philippine Area of Responsibility where PAGASA named it Ulysses the same day, and made three successive landfalls on the night of November 11–12, 2020: over Patnanungan, Quezon at 10:30 p.m., Burdeos on Polillo Island at 11:20 p.m., and General Nakar, Luzon at 1:40 a.m. (Wikipedia — Typhoon Vamco, Wikidata, DBpedia) After crossing Luzon and the South China Sea it briefly reached the equivalent of Category 4 intensity on November 13 before striking Vietnam on November 15. Both names were later retired from use — PAGASA replaced Ulysses, and the Typhoon Committee replaced Vamco. (Wikipedia — Typhoon Vamco)

The storm’s Philippine ledger was written in two valleys. In Metro Manila, the Marikina River hit about 22 meters by late morning of November 12, surpassing the level reached during Typhoon Ondoy in 2009 — the worst metropolitan flooding since that storm — even though PAGASA assessed that Ulysses dropped less rain than Ondoy; in the Cagayan Valley, the opening of all seven gates of Magat Dam on November 13 coincided with the region’s worst flooding in decades. The National Disaster Risk Reduction and Management Council’s counts, as compiled in the typhoon’s record, ran to roughly 100 validated deaths and damage of ₱20.2 billion — infrastructure ₱12.9 billion, agriculture ₱7.32 billion — with about 5.18 million persons affected and the whole of Luzon placed under a state of calamity on November 17, 2020. (Wikipedia — Typhoon Vamco)

Identities

Source	Identifier	URL
Wikipedia	Typhoon Vamco	https://en.wikipedia.org/wiki/Typhoon_Vamco
Wikidata	Typhoon Vamco (Q101437849)	https://www.wikidata.org/wiki/Q101437849
DBpedia	Typhoon Vamco	https://dbpedia.org/page/Typhoon_Vamco
ProductOntology	N/A	N/A
Wiktionary	N/A	N/A
Library of Congress Subject Headings (LCSH)	N/A	N/A
MeSH	N/A	N/A
NCBI Taxonomy	N/A	N/A
AGROVOC	N/A	N/A
Google Scholar	Typhoon Vamco Ulysses November 2020 Marikina flooding Cagayan Magat Dam NDRRMC Philippines disaster response	N/A
ConceptNet	N/A	N/A
OpenCyc	N/A	N/A

Also Known As

Typhoon Vamco
Vamco
Typhoon Ulysses 2020
Typhoon Ulysses (Vamco)

Examples and Analogies

One storm, two names, two retirements: PAGASA’s local name Ulysses and the international Vamco ran in parallel bulletins for the same cyclone, and both were retired afterward — the dual bookkeeping by which the Philippines and the world’s naming bodies each retire a storm’s name. (Wikipedia — Typhoon Vamco)
Ondoy’s benchmark, minus Ondoy’s rain: the Marikina River rose past its 2009 Ondoy mark to about 22 meters although PAGASA measured less rainfall than Ondoy — a demonstration that flooding follows basin conditions and antecedent saturation, not rainfall totals alone; the river’s anatomy is documented in this wiki’s Marikina River entry. (Wikipedia — Typhoon Vamco)
A dam converting storm into floodwave: with the reservoir at 192.7 meters, a third of a meter below spilling level, Magat’s operators opened all seven gates — the dam doing its structural duty of not overtopping while unavoidably adding its release to a river already in flood, the dilemma this wiki’s Magat Dam entry documents from the dam’s side. (Wikipedia — Typhoon Vamco, Wikipedia — Magat Dam)
The sixth-costliest entry: at ₱20.2 billion in damage, Ulysses ranks sixth among the costliest Philippine typhoons in the standard record — a ranking that measures both the storm’s force and the floodplains beneath it. (Wikipedia — Typhoon Vamco)

Usage Scenarios

1. Comparative Flood Studies

Engineers and researchers use Ulysses as the second data point in the modern Marikina pair — Ondoy 2009 and Ulysses 2020 — comparing gauge heights, rainfall totals, and inundation extents across the two events to test flood-control investments made in the decade between them. (Wikipedia — Typhoon Vamco)

2. Dam Operations and Reservoir Protocol Review

The November 13 gate openings at Magat — warnings issued two days ahead by the National Irrigation Administration’s own account, followed by its pledge to review water-release protocols and improve the watershed — are cited in reservoir-management discussions of release timing, public notification, and downstream conveyance capacity on the Cagayan River system. (Wikipedia — Magat Dam)

3. Disaster-Response Accounting

Agencies and insurers work from the NDRRMC’s tallies — roughly 100 validated deaths, 10–19 missing, about 5.18 million affected, ₱20.2 billion in damage — and from the state-of-calamity declarations: Marikina on November 13, Cagayan and Isabela in the dam-release flooding, and all of Luzon on November 17. (Wikipedia — Typhoon Vamco)

4. Emergency Communication Case Study

The storm’s aftermath is studied for the gap it exposed: the viral #CagayanNeedsHelp appeals of November 14 while rescue operations were hampered by low visibility, and the #NasaanAngPangulo campaign that the Palace publicly asked netizens to stop — a documented episode in the debate over crisis communication. (Wikipedia — Typhoon Vamco)

Strategies

Plan on the pair, not the single event: floodplain policy for Metro Manila’s east now assumes the Ondoy–Ulysses recurrence pattern — two record floods eleven years apart on the same river — rather than treating either as a once-a-generation anomaly. (Wikipedia — Typhoon Vamco)
Publish dam estimates before the gates move: the proposal pressed after Ulysses — that flood estimates be publicized when dam gates open, as the Vice President urged in the aftermath — addresses the release-timing controversy directly: warnings that precede releases by days are only effective if the downstream public receives and understands them. (Wikipedia — Typhoon Vamco, Wikipedia — Magat Dam)
Evacuate on river alarms, not rainfall totals: Ulysses surpassed Ondoy’s river level with less rain — the operational lesson that gauge-based alarm levels, not rainfall forecasts alone, must trigger evacuation in the Marikina Valley. (Wikipedia — Typhoon Vamco)
Pre-position for the second day: the Cagayan flooding peaked days after landfall, with rescuers still hampered on November 14 — the case for treating inland valley flooding as a separate, later emergency than the coastal landfall event. (Wikipedia — Typhoon Vamco)

Security and Safety Measures

Treat dam-release warnings as evacuation orders: the NIA states it warned Cagayan and Isabela residents two days before the releases, yet whole towns flooded to the rooftops near Buntun Bridge where the river rose some 13 meters — the standing lesson that reservoir-release warnings must be converted into enforced evacuation below large dams. (Wikipedia — Magat Dam, Wikipedia — Typhoon Vamco)
States of calamity as a response instrument: the sequence Marikina (November 13), Cagayan and Isabela, then all Luzon (November 17) shows the escalation ladder of calamity declarations that unlocks price controls and quick-response funds. (Wikipedia — Typhoon Vamco)
Rescue capacity sized for zero-visibility operations: rescue flights and boats were constrained days after landfall by low visibility — the planning gap Ulysses exposed in the Cagayan Valley’s rescue posture. (Wikipedia — Typhoon Vamco)
Verify casualty and damage figures against the official ledger: counts moved between situation reports — roughly 98 to 102 validated deaths depending on date, and damage consolidating at ₱20.2 billion — so post-event analysis should date every figure to its sitrep. (Wikipedia — Typhoon Vamco)

Historical Context

Ulysses arrived in a November already soaked: the 2020 season had just sent Typhoon Rolly (Goni) across Luzon, and the series continued with Quinta and Tonio around the same weeks — a cluster of cyclones that primed basins before Ulysses formed about 245 kilometers north-northwest of Palau on November 8, was named a tropical depression by PAGASA that day, and was named Vamco by the Japan Meteorological Agency on November 9. Its Philippine crossing took eleven hours of landfalls — Patnanungan, Burdeos, General Nakar — on the night of November 11–12. (Wikipedia — Typhoon Vamco)

The aftermath wrote itself into three records this site documents separately: the Marikina River’s flood history, where the ~22-meter reading surpassed the Ondoy benchmark; the Magat Dam and Cagayan River entries, where the November 13 opening of all seven gates at a reservoir level of 192.7 meters joined the already-swollen Cagayan system and flooded riverside towns, with water under Buntun Bridge rising as high as 13 meters; and the national disaster account, with the NDRRMC’s tallies of about 100 dead, 5.18 million affected, and ₱20.2 billion in damage, Luzon’s November 17 state of calamity, and Vietnam’s November 15 landfall closing the storm’s arc. Both names were retired afterward. (Wikipedia — Typhoon Vamco, Wikipedia — Magat Dam)

Challenges and Controversies

The Magat Dam Release-Timing Debate

The opening of all seven Magat gates on November 13 — with the reservoir 0.3 meters below spilling level — drew public criticism that the releases worsened the Cagayan Valley flooding, as the record documents; the National Irrigation Administration answered that it had warned residents of Cagayan and Isabela two days before the typhoon’s landfall, and committed to reviewing its water-release protocols and improving the dam’s watershed. The attribution of the flooding between dam releases, the storm’s rainfall, and the valley’s natural flood-proneness remains a matter of expert analysis rather than settled account. (Wikipedia — Typhoon Vamco, Wikipedia — Magat Dam)

“Nasaan ang Pangulo” and the Response Criticism

Days after landfall, netizens’ #CagayanNeedsHelp appeals went viral while rescues were hampered, and the #NasaanAngPangulo campaign drew a public appeal from the Palace to stop using the hashtag. President Rodrigo Duterte said security constraints and his doctors had advised against visiting storm-hit areas; Presidential spokesperson Harry Roque denied preparation shortcomings while conceding authorities “did not expect the gravity of the amount of water,” which he attributed to climate change, deforestation, and illegal mining; and the Tuguegarao city mayor apologized for a birthday trip to Batangas during the floods and was ordered to explain his absence to the interior department. (Wikipedia — Typhoon Vamco)

Warnings, Broadcasts, and the Information Gap

Critics pressed three structural questions documented in the record: whether flood estimates should be published whenever dam gates open, as Vice President Leni Robredo urged; whether the 2020 shutdown of ABS-CBN’s broadcast operations had left Cagayan residents without warning reach, as she also noted; and whether Congress’s ₱4-billion cut to the NDRRMC budget and the 2017 closure of Project NOAH had degraded the warning apparatus itself. (Wikipedia — Typhoon Vamco)