Pacific Typhoons

What it is

Tropical cyclones that develop over the western North Pacific Ocean and the South China Sea are classified as typhoons when sustained winds reach 64 knots (approximately 118 km/h). The western North Pacific is the most active tropical cyclone basin on the planet. Japan's RSMC Tokyo-Typhoon Center, the WMO-designated regional authority, has tracked an average of about 26 named storms per year across its 1951-to-present record. The US Navy's Joint Typhoon Warning Center, based in Pearl Harbor, issues parallel warnings for American military assets across the Pacific. Typhoons rotate counterclockwise in the Northern Hemisphere and draw energy from sea surface temperatures above roughly 26°C, with peak activity concentrated between 5°N and 25°N latitude from May through December.

History

RSMC Tokyo's best-track archive begins in 1951, with satellite observation becoming routine by the mid-1960s. Typhoon Tip (October 1979) set the global record for the lowest atmospheric pressure ever recorded in a tropical cyclone, at 870 hPa, with winds estimated at 305 km/h. Typhoon Haiyan struck the Philippines in November 2013, making landfall in Samar province as one of the strongest tropical cyclones ever recorded to hit land, killing more than 6,300 people and generating a storm surge that destroyed most of Tacloban city. The naming convention transitioned in 2000 from Western names to a rotating list contributed by the 14 member states of the ESCAP/WMO Typhoon Committee, an intergovernmental body covering Asia-Pacific preparedness. Seasonal activity correlates inversely with El Nino events, which suppress western Pacific convection and shift storm formation eastward.

Current state

The 2026 season opened with anomalously warm western Pacific sea surface temperatures fueling early and intense development. Super Typhoon Francisco peaked in late June at 185 km/h sustained winds before sequential systems struck the region: back-to-back storms entered the Philippine Area of Responsibility in late June, and Typhoon Mekkhala became the strongest June typhoon to threaten Japan's Ryukyu island chain in 22 years. A simultaneous second system, Tropical Depression Higos, created a forecast merger scenario south of Honshu that Japan's JMA described as highly unpredictable. The back-to-back sequence in June, well before the August-to-September peak, has raised concern among disaster risk managers in both countries about what the full season may bring.

Relationships

The ESCAP/WMO Typhoon Committee coordinates preparedness across 14 member governments, including China, Japan, the Philippines, South Korea, Vietnam, and Thailand. Japan's JMA issues the region's authoritative storm tracks, which national agencies including PAGASA (Philippines), CMA (China), and KMA (South Korea) translate into domestic warnings. The Philippines is the most exposed member, receiving an average of about 20 named storms per year in or near Philippine waters, with roughly eight making direct landfall. US Indo-Pacific Command monitors every named storm, since forward bases in Okinawa, Guam, and the Philippines all lie within the typhoon belt. Severe seasons disrupt shipping through the South China Sea and the Philippine Sea, two of the world's busiest container corridors.

What to watch

Sea surface temperature anomalies through peak season (August to September 2026) will determine whether the active early season extends into a record year. The primary life-safety variable remains landfall risk to the Philippines, Taiwan, Japan, and Vietnam as the season intensifies. Policy watchers should track whether the Typhoon Committee's post-Haiyan investment in early-warning systems and storm-surge modelling is translating into lower casualty counts when comparable-intensity storms make landfall in lower-income member states.