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Brown-water & flash flood.
The two advisories that actually shut down your day on Kauai — pulled live from the official sources. Check before any beach day, river crossing, or trail.
Live feeds
Brown Water Advisory
After heavy rain, runoff floods river mouths and bays with bacteria, leptospirosis, and debris. Wait 24–72 hours before entering the ocean near river mouths after a brown-water posting.
Live: Hawaii DOH Clean Water Branch — Kauai beach postings.
Open full mapFlash Flood Advisory
Hanakāpīʻai Stream and other Kauai streams flood with no visible warning — rain miles inland can send a wall of water down a sunny canyon in minutes. A WATCH means be prepared; a WARNING means GO NOW.