From: 2026/03/09, 03:06
To: 2026/03/09, 17:15

...FLOOD WATCH IN EFFECT FOR NIIHAU AND KAUAI BEGINNING TUESDAY... ...FLOOD WATCH IN EFFECT FOR OAHU BEGINNING TUESDAY EVENING... * WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...Oahu. * WHEN...From Tuesday evening through Saturday afternoon. * IMPACTS...Significant flooding may occur due to the overflow of streams and drainages. Roads in several areas may be closed, along with property damage in urban or low lying spots due to runoff. Landslides may also occur in areas with steep terrain. * ADDITIONAL DETAILS... - Considerable flash flooding is possible this week beginning Tuesday evening as a powerful kona low develops northwest of the state and draws deep tropical moisture across the islands. Persistent bands of heavy rain and thunderstorms may produce intense rainfall rates, leading to rapid rises in streams and flooding of roads and low-lying areas.

From: 2026/03/09, 03:20
To: 2026/03/09, 16:30

A powerful kona storm will begin impacting the western end of the state as early as Tuesday, then spread across the remainder of the island chain by midweek. While flash flooding remains a major concern (see the Flood Watch and Hydrologic Outlook for additional details), confidence is increasing that strong to severe thunderstorms may develop Wednesday into the weekend. Damaging winds will likely be the primary hazard with these storms, though large hail cannot be ruled out. In addition to the heavy rainfall and severe thunderstorm threat, strong and potentially damaging kona winds are possible late in the week and into the weekend.