Forming out of an area of disturbed weather on October 13, Ivan gradually intensified into a typhoon as it tracked steadily to the west-northwest.

On October 15, the storm underwent rapid intensification and reached an intensity corresponding to Category 5 status on the Saffir–Simpson Hurricane Scale.

Late on October 17, Ivan reached its peak strength with winds of 295 km/h (183 mph) and a barometric pressure of 905 hPa (mbar).

Ivan eventually made landfall in northern Luzon with winds of 220 km/h (140 mph) on October 20 before weakening to a tropical storm the next day.

Three resultant areas of low pressure formed; one in the Southern Hemisphere developed into Tropical Cyclone Lusi on October 8, and two north of the equator steadily tracked westward.

Late on October 17, Ivan attained its peak intensity with winds of 295 km/h (183 mph) and an official barometric pressure of 905 hPa (mbar).

[1][2] However, the JTWC reported an unofficial pressure of 872 hPa (mbar), which would tie Ivan for the second strongest tropical cyclone worldwide with Typhoons Gay, Angela, Joan, Keith, Zeb and Hurricane Patricia.

The typhoon began to slow and weaken, and on October 20, its center made landfall in extreme northern Luzon with winds of 220 km/h (140 mph).

Disaster agencies were put on high alert; relief supplies were then stockpiled, the navy was placed on standby, and military search and rescue vehicles were prepped.

[5] On October 20, Ivan made landfall in the northern Philippines, producing torrential rains that triggered waist-deep flooding in localized areas.

[8] Poultry farms and fisheries sustained significant damage; an estimated $3.6 million in losses resulted from lost stocks in the two businesses.