Heavy rains have pummeled the Hawaiian island of Oahu and triggered the worst flooding the island has in 20 yearsSign up for the Breaking News US email to get newsletter alerts in your inboxTowering flash floods and an imminent dam failure in the northern part of Oahu triggered mass rescues and evac uation warnings in Hawaii on Friday, as the state continued contending with a powerful storm this week.The waters came on quickly in the middle of the night, and videos on social media captured inundated streets and cars being swallowed by the muddy flood waters. Continue reading... ...read more read less