[2] During the next few days, it slowly increased in organization and thunderstorm activity after which a small and ragged central dense overcast formed and upper-level outflow improved.

[3] During the first week of April, the typical northeasterly trades clashed with a Southern Hemisphere Westerly wind burst, creating an area of low pressure near the Caroline Islands.

[6] The origins of Typhoon Sperry can be traced back to a weak surface circulation that formed on June 24 as part of the monsoon trough 370 km (230 mi) northwest of Truk.

The two areas consolidated into one on June 25, even though further development was initially slow to occur due to strong wind shear created by a tropical upper tropospheric trough near Wake Island.

[4] At noon on June 28, the JTWC and JMA reported that Sperry peaked in strength; the agencies estimated winds of 135 and 120 km/h (85 and 75 mph) respectively at this time.

Thunderstorm activity quickly became displaced from the center due to increased wind shear,[4] and the JMA downgraded Sperry into a severe tropical storm at 00:00 UTC on June 30.

A well-defined low level circulation quickly developed, but convective activity remained limited until July 16,[4] when both the JTWC and JMA upgraded the system into a tropical depression.

[5] Shortly after its peak, Typhoon Vernon began to interact with the rugged terrain of Taiwan as it skirted the eastern shore and the JTWC and JMA estimated that Vera rapidly weakened to a tropical depression on July 21.

As it rounded the western periphery of the subtropical ridge, the cyclone became sheared from the north, which caused the storm to weaken and its center to become exposed from the deep convection.

Typhoon Betty formed from the monsoon trough that, according to the JMA, spawned a tropical depression on August 8 while around positioned well to the east of the Philippines.

[5] Betty turned westward, where it rapidly intensified, becoming the second super typhoon of the season, before attaining peak intensity on August 11.

Intensification was initially gradual, but Dinah became a typhoon early on August 24, and subsequently began to intensify at a faster pace.

The system then began to recurved towards southwestern Japan, and after passing through the area, Dinah transitioned into an extratropical cyclone on August 31, although the remnants could be traced for four more days as it approached the International Date Line.

[4] The final of a three storm tropical cyclone outbreak, Holly began as a poorly organized but persistent area of convection at the eastern edge of the monsoon trough, which was displaced a bit to the north of its climatological position.

Shower and thunderstorm activity developed over the center,[4] and at 00:00 UTC on September 5, the JMA classified the system as a tropical depression,[5] with the JTWC doing the same six hours later.

A central dense overcast quickly developed,[4] and the JMA upgraded Holly into a severe tropical storm at noon on September 7 and a typhoon 12 hours later.

[4] Following a 36-hour period of rapid deepening, the JMA estimated that Holly attained its peak intensity of 200 km/h (125 mph) midday on September 9.

[4] Typhoon Ian began as broad and poorly organized tropical disturbance situated roughly 610 km (380 mi) east-northeast of Guam.

At the time, the disturbance was embedded in the Western Pacific monsoon trough, which re-established itself after being disrupted by the previous tropical cyclone outbreak.

[5] Despite lacking an inner core,[4] Ian was believed to have attained typhoon intensity that same day by both the JTWC and JMA,[4][5] and subsequently, entered a period of rapid deepening.

The storm's slow motion caused the typhoon to upwell cold water, which contributed to a decrease in cloud top temperatures around the eye.

After briefly becoming quasi-stationary, Peke veered to the north-northeast, only to drift back to the southeast as the storm's low- and mid-level centers diverged.

The JTWC stopped tracking the system on October 3, although its remnants lingered for another three and half days due to collapsed steered currents.

[5] By September 30, shower and thunderstorm activity had increased considerably,[4] prompting both the JTWC and JMA to upgrade the system into a tropical storm.

Increased vertical wind shear caused the low-level center to become detached from the shower and thunderstorm activity and the JTWC issued their final warning on system at 00:00 UTC on October 1.

On Shikoku Island Kelly dropped 20 inches (510 mm) of rain, resulting floods and landslides killed 9 people.

At the time, the disturbance had a well-defined surface circulation and persistent deep convection, but little development was expected due to strong wind shear aloft.

The depression quickly lost organization due to strong wind shear, and at 00:00 UTC on November 12, the JTWC issued its last warning on the system.

[4] Tropical Storm Nina, which began its life on November 16 in the eastern portion of the Western Pacific Ocean, slowly strengthened to a typhoon on the 21st.

[12] Offshore northern Samar Island, a ferry boat carrying 50 people sank, though 27 were rescued, the bodies of 10 drowning victims were recovered and 13 others were feared dead.