Hawaii is bracing for significant flooding as a powerful storm system progresses eastward, posing a serious threat to the Big Island after already impacting Oahu and Maui. Meteorologists have issued advisories for minor flooding on Oahu and Maui, while a more severe watch is in effect for the Big Island due to the potential for urban flooding. The storm has unleashed heavy rainfall, with rates reaching 2 to 3 inches per hour on Oahu's western shore, leading to flash flood warnings.