Additionally, Usagi was also part of the four tropical cyclones to simultaneously exist in the Western Pacific during the month of November, the first time since records began in 1951; the other three were Yinxing, Toraji and Man-yi.

As it moved westward along the southern periphery of a mid-level subtropical high, the system exhibited formative convective banding wrapping cyclonically around the northern and western quadrants, signaling intensification.

The Japan Meteorological Agency (JMA) noted that Usagi reached its maximum strength with 10-minute sustained winds of 175 km/h (110 mph) and a central pressure of 940 hPa (27.76 inHg).

The system, exhibiting a very ragged appearance and weakening significantly due to increasing vertical wind shear, showed disorganized rotation and slow spin just offshore of southwestern Taiwan.

PAGASA issued Tropical Cyclone Wind Signal for various areas, and the DSWD announced it had spent ₱1 billion (US$20.3 million) in response to Usagi and previous storms.

As a precaution, two spillways at the Magat Dam were left open, and authorities advised people evacuated due to earlier typhoons not to return home.

[4] The next day, the JTWC designated the system as 27W, as it developed at the southeast end of an active zone extending from the Philippine Sea off the northeast coast of Luzon.

[5] As it moved westward along the southern periphery of a mid-level subtropical high, the system exhibited formative convective banding wrapping cyclonically around the northern and western quadrants, signaling intensification,[6] and at 18:00 UTC on the same day, the JMA upgraded the system to a tropical storm and named it Usagi;[7] it then moved into the Philippine Area of Responsibility, where PAGASA named it Ofel.

[10][11] On November 12, both the JMA and the JTWC upgraded the system to a minimal typhoon, as it exhibited well-defined convective banding tightly wrapping around an obscured low-level circulation center.

[16] Usagi made landfall in Baggao, Cagayan, on Luzon Island at around 1:30 PM PHT (05:30 UTC) on November 14,[17] as indicated by satellite imagery, with the eye quickly filling and the central dense overcast becoming more asymmetric.

[18] After crossing northern Luzon, Usagi emerged into the Babuyan Channel, moving northwestward along the southwestern periphery of a mid-level subtropical high and passing close to the Babuyan Islands and northern Cagayan,[19] leading the JMA to downgrade the system to a severe tropical storm,[20][21] while satellite imagery shows a rapidly weakening low-level circulation with deep convection flaring to the northeast of a broad, partially exposed center.

[43] The South Korean government provided aid valued at ₱30 million (US$609,137.06) through the World Food Programme to assist those affected by Trami and other recent storms, including Kong-rey, Yinxing, Toraji, and Usagi.