A developing Kona low situated west of the Hawaiian Islands is the driving force behind the impending severe weather. Forecasters report that the low-pressure system is expected to draw a massive amount of tropical moisture northward as it actively strengthens over the coming days, eventually tracking north by early next week.

While preparations are underway, meteorologists note a brief window of calm before the storm’s full impact is felt across the island chain.

“Despite this abundance of moisture in the region, today is still likely to be the driest portion of the forecast for the rest of this week, ahead of the next low pressure system that is forecast to form nearby. Winds will remain relatively light and variable through tonight.” — National Weather Service

Flood Watch Details and Timing

Residents and visitors across the state are urged to prepare for rapidly deteriorating conditions. The National Weather Service highlights the following key alerts:

Active Flood Watch: The official alert remains in effect from 6 p.m. Thursday to 6 p.m. Sunday, covering the major populations of Oahu, Maui, Molokai, and Hawaii island.
Flash Flooding Risk: The continuous influx of abundant tropical moisture significantly increases the threat of sudden, dangerous flash floods, particularly in low-lying areas, valleys, and regions with poor drainage.
System Trajectory: The Kona low will dictate heavy rainfall patterns through the entire weekend before it is projected to shift its path northward early next week.

Local emergency management officials advise against unnecessary travel during heavy downpours. Motorists are strictly warned never to attempt crossing flooded roads or flowing streams, as water depths and currents can be highly deceptive.

‘Widespread Rain’ and Flash Flooding Threaten Hawaii as Kona Low Approaches.