[1] An aerial reconnaissance crew (similar to Hurricane Hunters) sent to investigate Joan on October 13 encountered severe turbulence and a g-force reading of 2.5 gs[1] as the storm was at its peak.

The storm made landfall near noon the same day in the Lagonoy Gulf region of Luzon, but not before it had threatened and brushed the coast of Catanduanes Island.

A trough over central China interacted with the ridge line and made Joan turned more northerly, and the storm took aim at the northeastern tip of Hainan Island on October 17.

In Virac, on the island, the Philippine Weather Bureau station recorded a minimum sea level pressure of 950.7 mb and winds of 150 knots (280 km/h), but was heavily damaged.

Typhoon Joan made a direct hit on Naga City, where many people died from flying debris, collapsing homes, falling trees and floods.

USS Agerholm (DD-826), a 3,500 ton US Navy destroyer with 360 men on board, experienced 40 foot waves and 75 mph winds for 2 days close to the Paracel Islands.