Continuing westward, the system eventually struck the Philippines as a minimal typhoon before dissipating over the South China Sea on January 19.

By January 6, the JTWC began monitoring the disturbance for the possibility of it developing into a tropical cyclone; a mirror system was present in the Southern Hemisphere at the same time.

Early on January 8, the JTWC issued their first advisory on Tropical Depression 01W, at which time the system was located near the Marshall Islands.

[2] Tracking nearly due west, the depression was upgraded to Tropical Storm Roy six hours after the first advisory based on satellite data.

Embedded within a moderate east-southeasterly flow along the south side of a subtropical ridge, the typhoon accelerated, obtaining a forward speed of 40 km/h (25 mph).

[2] At the same time, the JMA estimated that the storm attained peak winds of 155 km/h (95 mph) along with a barometric pressure of 940 mbar (hPa; 27.76 inHg).

As the storm passed through the region, a new ridge built east of the typhoon, causing Roy to temporarily track southwestward before resuming a westward movement.

[2] On January 14, the storm crossed 135°E, prompting the Philippine Atmospheric, Geophysical and Astronomical Services Administration to issue advisories on Roy, assigning it with the local name Asiang.

On January 16, Roy made landfall in the Bicol Region as a minimal typhoon before weakening to shear and increased friction with the mountains of the Philippines.

[6] On January 12, Typhoon Roy passed through the Mariana Islands and Guam, causing moderate structural damage and extensive crop losses.

[2] At least 200 of the 450 of homes on Rota were destroyed and the remainder were damaged;[7] 95% of the power poles fell across the island, resulting in severe disruption to daily life.

Continuing westward, the Roy brought gale-force winds to parts of southern Luzon before moving into the South China Sea.

[14] According to the JTWC, Roy was the third-most intense typhoon during the month, attaining peak winds of 215 km/h (135 mph) and an estimated pressure of 927 mbar (hPa; 27.37 inHg).