A Category Four storm on the Saffir Simpson scale is capable of doing widespread major structural and infrastructure damage; it can easily tear off roofing, shatter windows, uproot palm trees and turn them into projectiles that can kill people.
Forecasters expect little significant change in Hector's strength in the coming days. Nevertheless, an outer rain band and some gusty winds could make it to the southern edge of the island through Friday. Tropical storm conditions are expected across portions of the Big Island later today as the core of Hector passes to the south. A Tropical Storm Watch has been issued for Hawaii County. Large surf is also expected along east facing shores of Maui.
If the storm deviates northwards it could bring Hector close enough to impact the Big Island directly.
CPHC said "Swells generated by Hector will likely produce large and risky surf along southeast and east facing shores of the Big Island today".