Swell & Shutter
light · tide · swell · sky — a live briefing for any U.S. coast

Pick a stretch of coast.

Search above, drop a pin, or hit “my location.”

The light timeline

The numbers

today at a glance

Water hazards

official alerts first, modeled estimates second — they are not the same thing

Night sky

Milky Way core · aurora watch · meteor calendar — computed for your point

Three-day outlook

Rain & storm

Data: NOAA CO-OPS (tides) · Open-Meteo (weather, marine, air) · NWS api.weather.gov (official alerts) · NOAA SWPC (aurora) · Launch Library 2 (launches) · Windy (maps). Sun, moon & Milky Way computed locally in this page.
Rip & longshore estimates are modeled, not official forecasts — always check posted conditions and lifeguards before entering the water.
No accounts, no tracking, no server: your browser talks straight to the public APIs.