After tracking northwest initially, Agnes turned west-northwest the next day, a course that the system would maintain for the rest of its lifetime.

The storm weakened over land, but re-intensified over the South China Sea; Agnes obtained a secondary peak intensity on November 6.

Typhoon Agnes was the final of a series of tropical cyclones to affect the Philippines that season, following June, Ike, and Warren.

Throughout Panay Island, four hundred forty-eight fatalities were reported, at least eight people were injured, five bridges were destroyed, and thirty-five schools were demolished.

The Bình Định Province suffered the brunt of the typhoon, where 134 people died and 289 sustained injuries.

Satellite imagery indicated a possible low pressure area near 149° E. Although the disturbance was not attached to the monsoon trough, an upper-level anticyclone became situated aloft, providing the system with strong ventilation.

[nb 1][4] Late on October 31, shower activity increased drastically in both coverage and organization as the disturbance tracked northwest.

At 06:00 UTC on November 1, the JTWC issued its first warning on the system, upgrading it to a tropical storm and naming it Agnes.

[6] Around this time, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) also monitored the storm and assigned it with the local name Undang.

[1] At the same time, the JMA estimated peak intensity of 195 km/h (120 mph) and a minimum barometric pressure of 925 mbar (27.3 inHg).

[4] Shortly after attaining maximum intensity, the typhoon continued west-northwest and made landfall 10 km (6.2 mi) south of Borongan on Samar Island.

Land interaction resulted in a weakening trend as it crossed the archipelago; however, due to its brisk forward motion, the JTWC reported that Agnes was still a typhoon when it emerged into the South China Sea,[1] though the JMA estimated it weakened into a severe tropical storm over land.

Rapid weakening occurred over land, and at 00:00 UTC on November 8, the JTWC ceased following Agnes[1] as it had tracked into Thailand.

[9] In the Iloilo province, several rivers overflowed their banks, resulting in 1.8 m (6 ft) deep water along streets.

[11] Based on reports from the Philippines Welfare Ministry, 491,968 people were evacuated to shelter in 27 provinces,[24] most of whom were homeless.

[26] Agnes marked the final of several tropical cyclones to hit the nation that season, after June,[27] Ike,[28] and Warren.

[29][1] The United Press International noted it was the first time in living memory that Philippines was deluged with three catastrophic storms.

[30] President Ferdinand Marcos declared a state of emergency for the provinces of Capiz, Iloilo, Aklan, Antique, Leyte, and eastern Samar.

[32] Immediately following Agnes, the Government of the Philippines dispatched a C-130 aircraft carrying relief supplies to the affected areas, including 40,000 lb (18,000 kg) of food and medicine to Roxas, where thousands of residents had gone days without eating.

[19] The Philippines Air Force provided 163 short tons (148 t) of food for 30,000 people,[33][34] medicine and clothing.

[34] In addition to national aid, various countries and human rights related organizations provided varying forms of assistance.

The United States provided $25,000 in cash plus an additional $40,000 to help school re-construction and $540,000 to help re-build destroyed homes.

In addition, the League of Red Cross Societies provided 200 short tons (180 t) of milk powder and $112,360 in cash contributions.