Flash Flood Warnings in Hawaii, 2026

By month

33 of 52 flash flood warnings covering Hawaii in 2026 had a flash flood report inside them; 96 of 146 flash flood reports fell inside a warning, on average 296 minutes after it went out.

Hawaii, 2026

Each office's whole area, 2026

An office's figures cover every county it serves, including across state lines.

The year is still running; reports filed late and damage surveys can still change these figures.

Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.

• Kalawao County16
• Honolulu County15
• Hawaii County13
• Kauai County8

1. March 21, 20265flash flood warnings
2. August 16, 20265flash flood warnings
3. March 14, 20264flash flood warnings
4. March 15, 20263flash flood warnings
5. March 20, 20263flash flood warnings
6. March 23, 20263flash flood warnings
7. April 8, 20263flash flood warnings
8. April 10, 20263flash flood warnings
9. September 7, 20263flash flood warnings
10. February 21, 20262flash flood warnings
11. March 22, 20262flash flood warnings
12. January 23, 20261flash flood warnings

Alerts in force nowTornadoes on recordThe radar archive2025

National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.