Flash Flood in Honolulu County, Hawaii

Flash Flood February 21, 2026 · Honolulu County, Hawaii

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

A Moanalua Gardens employee reported the Moanalua stream overflowed its banks and flooded the Moanalua Gardens parking lot and field with debris.

The wider storm

A cold upper level trough along with deep moisture and southeasterly winds allowed heavy rainfall to develop over the Koolau mountain range of Oahu, over Kauai, and over windward portions of Maui. On Oahu, the heavy rain developed and remained persistent for several hours, which led to flooding and flash flooding over the eastern and northern portions of the island. Particularly the Koolau Mountain Range was impacted. Portions of Maui and Kauai also experienced flash flooding.

Began near Fort Shafter (21.3517, -157.8946).

Source: NOAA Storm Events Database, event 1308838. Narratives are written by the National Weather Service forecast office that issued the report.

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