Forecast only — operators and the Cape Maeda flag make the final call. Booking links are affiliate links (we may earn a commission).
Forecast only — operators and the Cape Maeda flag make the final call. Booking links are affiliate links (we may earn a commission).
Every morning at 06:00 JST this site pulls wave height, wave direction, wind speed and wind direction off Cape Maeda (the Blue Cave) from the Open-Meteo marine forecast and turns them into an open probability, using the thresholds local dive shops actually use: most of them close the cave at roughly 1.5 m of swell or in a strong northerly. Cape Maeda faces north, so northerly wind and swell are weighted more heavily.
○ (70% or more) usually means snorkel and dive tours run at the cave. △ (45–69%) is a shop-by-shop call on the day. × (under 45%) means the cave is most likely closed — tours usually still run, but move to an alternative site such as Sunabe (Ginowan) or Cape Zanpa.
Ferry status for Tokashiki, Zamami and Aka is a forecast for the Tomari–Kerama route: partial cancellations become likely from about 2.3 m of swell, and most sailings are cancelled above 3 m. Official cancellation notices come from the ferry operators.