RICHARD WALKER / RWALKER@STARBULLETIN.COM
Traffic was reduced to one lane in each direction last night as the H-1 freeway at the Punahou Street overpass was flooded by runoff from heavy rain. A flash flood warning was issued for Oahu until early today. The weather service said heavy showers were falling over the Koolau mountains, in some areas up to 3 to 4 inches per hour.