 Passing just south, Joan brought rough seas and winds of 40 mph (65 km/h) with gusts to 55 mph (90 km/h) to the islands of Aruba, Bonaire, and Curaçao on October 16, damaging coastal facilities and roofs.Structural damage from the storm was estimated at $1.5 million (1988 USD).Increased moisture in Joan's wake caused persistent rainfall on the islands for several days, leading to widespread flooding.