These agencies include the Tropical Storm Risk (TSR) Consortium of University College London, PAGASA and Taiwan's Central Weather Bureau.

[1] These numbers were supported by the current values from the Indian Ocean Dipole, the Accumulated Cyclone Energy index and the sea-surface temperatures in the Niño 3.75 region, leading to a stronger than normal trade windspeed throughout much of the Western Pacific.

Tropical Storm Vongfong then rapidly intensified into a significant typhoon and struck the central part of the Philippines on May 14, first making its landfall in San Policarpo, Eastern Samar, crossing 4 more islands and then hitting mainland Luzon.

After Vongfong, another month of inactivity ensued, and on June 10, a new tropical depression formed off the coast of Samar, Philippines, and was named Butchoy by the PAGASA a day later.

[19] The prolonged interaction with land caused Vongfong to weaken, though the storm maintained a compact circulation amid otherwise favorable atmospheric conditions.

[37] The rains from the tropical depression prompted PAGASA to declare the start of the rainy season in the Philippines on June 12, 2020, which was also during the country's Independence Day.

[43] Carina moved north-northwest over an environment favorable for further development, with low vertical wind shear, established equatorial outflow and 28–29 °C sea surface temperatures.

[citation needed] By 12:00 UTC on July 14, Carina rapidly weakened into a low-pressure area, due to an unfavorable environment with strong wind shear.

[51] With favorable conditions of low vertical wind shear, strong equatorial outflow and 31 °C sea surface temperatures,[51] Dindo intensified into a tropical storm on midday of the same time, and the Japan Meteorological Agency named it as Hagupit.

[citation needed] Environmental conditions became conducive for development, and the JMA declared that a tropical depression had formed in the early hours of July 31.

[74] The remnants of Sinlaku emerged in the Indian Ocean and intensified into a well marked low-pressure area between August 5–8, recreating a lot of torrential rain in portions of India.

[75][76] On August 6, the Philippine Atmospheric, Geophysical and Astronomical Services Administration started to monitor a low-pressure area that developed well east of Virac, Catanduanes.

[citation needed] Another area of persistent convection formed within the proximity of the trough that would also spawn Tropical Storm Jangmi On August 7, west of Luzon.

[100] The China Meteorological Administration issued a Level III emergency response, while flood control workers were sent to areas which were hit by Mekkhala.

Winds generally reached gale to storm force over the southern part of Hong Kong under the influence of Higos' small circulation.

[111] On August 19, the JTWC began monitoring a broad area of low pressure situated a couple hundred miles northeast of the Philippine archipelago.

[128] While Typhoon Maysak is holding its peak intensity, JTWC announced another formation of a very disorganized tropical disturbance situated a couple hundred miles northeast of Guam.

[132] Early on September 4, the JTWC assessed that Haishen became a Category 4-equivalent super typhoon – with 1-minute sustained wind speeds of 135 kt (155 mph; 250 km/h),[133] with a clear, symmetrical eye visible on satellite imagery.

[146] Since the depression formed inside of the Philippine Area of Responsibility (PAR), the PAGASA immediately issued a severe weather bulletin on the storm and named the system Leon.

[184][185][186] In Cambodia, severe flooding affected 16 provinces including Phnom Penh, killed at least 21 people, damaged over 25,000 homes over and over 180,000 hectares of farmland.

[201] As the system entered the South China Sea in the early hours of October 15 UTC, the PAGASA lifted all tropical cyclone warning signals for Ofel.

[213] Saudel made landfall over the San Ildefonso Peninsula in Casiguran, Aurora on October 20 at 13:00 UTC (21:00 PHT) and began crossing the Luzon Island.

[141][220] 20W formed over marginally favorable conditions for development, before turning southwest after originally moving northeastward, encountering strong wind shear.

[233] Molave made 3 more landfalls in San Andres, Quezon, Torrijos, Marinduque and Pola, Oriental Mindoro before entering the South China Sea on October 26.

[238] After Typhoon Molave devastated the Philippines, the JMA announced the formation of a new tropical depression in the Pacific Ocean, west of the Mariana Islands, on October 27.

[251] On October 28, the JTWC began tracking another tropical disturbance 95 nautical miles (110 mi) south-southwest of Chuuk in the Federated States of Micronesia.

[260] On November 7, the Japan Meteorological Agency (JMA) began tracking a tropical depression 460 nautical miles (850 km; 530 mi) east-southeast of Manila.

Etau killed two people in Quảng Nam and Bình Định and damaged 400 houses when it made landfall in central Vietnam on November 10.

[297][298] The JTWC then issued their final warning on Krovanh the next day shortly after most of its central convection had dissipated due to increasingly hostile wind shear.

During the season, 23 tropical storms developed in the Western Pacific and each one was named by the JMA, when the system was judged to have 10-minute sustained windspeeds of 65 kilometers per hour (40 mph).