While passing near Guam, the disturbance was designated a tropical depression. Shortly after, the depression became disorganized as wind shear displaced the convection associated with the storm. Over the next 24 hours, the depression stalled in response to weak steering currents before a subtropical ridge developed to the north and caused the system to move quickly to the west. The low became separated from almost all of its convection on October 6 before being absorbed into a frontal system the next day. Typhoon Ivan (Narsing) 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 and a barometric pressure of 905 hPa (mbar). Shortly thereafter, the typhoon began to weaken as it approached the Philippines. Ivan eventually made landfall in northern Luzon with winds of on October 20 before weakening to a tropical storm the next day. The storm then curved northeastward and became extratropical on October 25, dissipating the following day. During its existence, Ivan was monitored by PAGASA and designated with the local name Narsing. Although Ivan was a powerful storm at landfall, its effects were relatively minor compared to the storm's intensity; however, 14 people were killed during the storm and two others were listed as missing. Agricultural industries sustained the most severe damage, as thousands of animals drowned in the storm. Throughout the Philippines, damage amounted to $9.6 million (1997 USD; $13.1 million 2009 USD). A total of 1,779 homes were destroyed, 13,771 others were damaged and 4,600 hectares of farmland were flooded by the storm. Typhoon Joan Typhoon Joan caused significant damage throughout the Marshall Islands. The most severe damage occurred on Anatahan where 37 homes were destroyed. Three people were injured during preparations for the storm when a wind gust blew a sheet of plywood into residents. Damages from the storm amounted to $200,000, mainly on Anatahan. Typhoon Keith The tenth of eleven tropical cyclones to attain super typhoon intensity in the western North Pacific during 1997, Keith formed at low latitudes in the Marshall Islands. It was one of ten TCs which formed east of 160°E and south of 20°N — within the "El Niño".