On October 27, an area of convection with a broad circulation persisted southeast of Guam, and slowly consolidated due to moderate wind shear and westerly outflow.

[1] That day, the Japan Meteorological Agency (JMA)[nb 2] classified the system as a tropical depression about 380 km (235 mi) to the southeast of Hagåtña, Guam.

[2] At 2100 UTC on October 28, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) began issuing advisories on the depression, giving it the local name Vinta.

[2] Later, increasing wind shear caused the eye to deteriorate, and Krosa began slowing about 260 km (160 mi) east-southeast of Hong Kong after reaching the western edge of the subtropical ridge.

[2] Before Krosa struck the Philippines, PAGASA issued a number 3 warning signal for portions of northern Luzon, where winds were expected to reach over 100 km/h (62 mph).

[26][nb 4] After the storm, workers quickly restored power lines, while the government provided monetary assistance to storm-ravaged families,[28] after Cagayan was declared a state of calamity.

[29] The China National Meteorological Centre issued a "yellow alert", the second-lowest of the four level warning system, for Hainan due to the threat of the storm.

[30] Agencies in Vietnam also warned for the potential of heavy rainfall due to the dissipating Tropical Depression Krosa,[31] and released water from three dams to prevent overflow.