Brown-water advisories, ocean conditions, marine forecasts, surf alerts, and tsunami warnings. Hawaii H2O Watch lets you watch any beach, bay, or shoreline in Hawaii and tells you the moment something changes.
For surfers, sailors, fishermen, divers — anyone who loves a Hawaii beach.
Type a name like "Pipeline" or "Hanauma" — or paste an address or coordinates. Pick the radius you want to watch: 1, 5, 50, or 100 miles.
Banzai Pipeline. Waimea Bay. Hanauma Bay. Anywhere you surf, sail, dive, or swim. Each beach gets watched independently.
Brown-water advisories, marine warnings, surf advisories, tsunami warnings — when something happens near one of your beaches, you'll see an Alert.
Hawaii H2O Watch pulls live data from the Hawaii Department of Health Clean Water Branch, the National Data Buoy Center, and the U.S. National Weather Service — official sources, refreshed daily. No noise, no hype. Just what's actually happening at the beach you care about.
Type a name, paste an address, or drop in coordinates. Auto-complete pulls from Hawaii DOH's beach list — pick your radius (1, 5, 50, or 100 miles) and add it to your Watchlist. Your address stays private.
Home break. The bay where the kids swim. The dive site you check before driving across the island. Each beach has its own radius and its own alerts. Tap any of them to see what's happening right now.
Watch radius mapped on the satellite. Live ocean conditions from NDBC stations. Water quality from Hawaii DOH brown-water and beach advisories. Marine and surf alerts from the National Weather Service. "No active alerts" is a perfectly good answer — and it means we're still watching.
Pin the beaches you check most often — your home break, the cousin's regular spot, the one you'll surf this weekend — and tap any of them for fresh data on demand. Same data as your watchlist, faster to reach.
Or just try it now — open it in your browser:
Hawaii H2O Watch is a web app — it installs in one tap, with no app store needed. Once installed, it has its own icon on your home screen and runs full-screen, just like any other app.
The Hawaii H2O Watch icon will appear on your home screen next to your other apps. Tap it any time to launch.
Some versions of Chrome show an automatic install banner at the bottom of the page — you can use that instead if you'd like.
Already on your phone? Just open it.
Open Hawaii H2O Watch →3Brains is a small platform of watch apps. Once you know one, you know them all — add what you care about, and we'll alert you when something changes.
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