The JTWC also issued warnings on storms within the basin, operating from Pearl Harbor in Hawaii and supplying forecasts to the United States Armed Forces in the Indian and Pacific Oceans.

It is only calculated for full advisories on specific tropical and subtropical systems reaching or exceeding wind speeds of 39 miles per hour (63 km/h).

Two of these systems were only recognised as minor tropical depressions, while the other strengthened to the first official named storm of this year, Cimaron, which moved through the Philippine archipelago in the middle of the month.

[10] On 18:00 UTC of February 17, both the JMA and PAGASA began to track a tropical depression that was located about 324 km (201 mi) to the northeast of Surigao of Northern Mindanao.

[11] The JMA downgraded the system to a low-pressure area, and its remnants tracked northward, where it was last noted off the coast of the Ilocos Region on February 23.

[13] Cimaron slowly began to transition into an extratropical cyclone due to a weakening trend with vertical shear as the storm accelerated northeastward.

[17] Chebi headed northwest while being located east of the Philippines on June 21 at 06:00 UTC, and would later attain severe tropical storm intensity, before intensifying further to a typhoon the following day.

[18] The Penghu Islands, which took the brunt of the typhoon, suffered considerable damage as 102 fishing boats sank and ten thousand people were left without power.

[13] Durian made landfall on the Leizhou Peninsula,[13] before rapidly weakening as it continued in the same direction before the JTWC stopped advisories of the storm on July 2,[11] with the JMA doing the same the following day.

[26] Utor spawned from an area of convection that developed off 907 km (565 mi) south-southeast of Guam on June 26, that remained quasi-stationary for 2 days before upgrading to a tropical depression on July 1 due to favorable conditions such as low vertical shear.

[13][27] Utor tracked west-northwest from a peripheral ridge and developed further, after entering the Philippine Area of Responsibility, and attained severe tropical storm status the following day.

Satellite imagery depicted that a tightly wrapped convective banding was circulating around a developing eye, signalling that Yutu was undergoing a phase of rapid deepening.

[27][11] A persistent but isolated deep convection near a broad LLCC was embedded to the monsoon trough approximately 356 mi (573 km) west of Guam on July 24.

[13] Torrential rainfall produced by the storm triggered flash flooding and landslides across Taiwan, killing 200 people and leaving NT$7.7 billion (US$245 million) in damage.

By August 17, Pabuk briefly reached its initial peak strength as a low-end Category 2 typhoon as it moved west-northwest[35] before slowly weakening.

[40] On 12:00 UTC of August 24, the JMA started to track a weak tropical depression that had developed about 648 km (403 mi) to the northwest of Wake Island.

Wutip still strengthened until it reached super typhoon intensity on 06:00 UTC of August 29 – the first of this season – with 1-minute sustained winds of 240 km/h (150 mph) and a minimum pressure of 930 hPa.

Wutip rapidly weakened down to tropical storm intensity by September 1, when it was already interacting with drier air, making its LLCC become exposed.

[32] On August 29, a satellite passing revealed that most of its convection had already scattered, prompting the JTWC to lower Sepat's intensity to minimal tropical storm strength.

[13] Initially an area of thunderstorms formed west of Luzon late on August 26, possibly due to the remains of former Tropical Depression Jolina.

[32] Excessive rains fell in mainland China, with locations in Changjiang county measuring up to 831.1 mm in the 3 day period ending late on August 31.

[13] Over the next 5 days, Nari executed a triple loop over open waters, reaching a peak of 115 mph (185 km/h) winds before weakening to a tropical storm on the 14th.

Shortly thereafter, due to the mountainous terrains of Taiwan, Lekima's structure had rapidly deteriorated and the typhoon had weakened back into a tropical storm.

[13] However, the JTWC re-upgraded Lekima back to a minimal tropical storm for a twelve-hour period on September 28, before weakening again as it moved over the western waters of the island.

[13] The system began to undergo a period of rapid intensification, in which Krosa reached its peak intensity as a Category 3-equivalent typhoon with 1-minute sustained winds of 195 km/h (121 mph) on 12:00 UTC.

[13] Although it still had super typhoon strength, Podul showed its first signs of extratropical transition and by 18:00 UTC, was located 1,296 km (805 mi) northwest of Wake Island.

[11] Maintaining its intensity, 28W tracked westward and entered the Philippine Area of Responsibility on November 20, with PAGASA to start issuing bulletins and naming it Ondoy.

After deep convection was seen developing from multi-spectral imagery,[49] the JTWC followed suit and began issuing advisories on 00:00 UTC of December 5 — giving the identifier of 30W.

[49] Operationally the same system as Typhoon Faxai, an area of unorganised convection in a region of weak to moderate vertical wind shear had persisted to the southwest of Pohnpei on December 10.

On June 19, the JMA followed suit on classifying Darna to a tropical depression, however, being located in an area of weakly sheared environment, the system rapidly weakened and dissipated.