High Surf Advisory Hits Big Island East Shores; 10-12 Foot Waves Expected

The National Weather Service forecast office in Honolulu issued a high surf advisory on Jan. 4 that took effect at 6 a.m. Monday for the Big Island’s east-facing shorelines and other eastern coasts across the state. The advisory is scheduled to remain in force through 6 a.m. Wednesday, Jan. 7, and warns of surf heights between 10 and 12 feet in the affected locations.

Forecasters say an easterly wind fetch generated by lowering pressures south and west of the islands is producing a significant easterly wind wave swell. That building east swell, combined with a smaller-period chop that reached advisory heights early Monday, will raise wave energy along most eastern shorelines through early Wednesday. The advisory cautions that strong breaking waves and strong currents will make swimming dangerous.

The advisory language emphasized public safety and recommended following the direction of ocean safety officials. The advisory included this guidance for the public: "Remember: when in doubt, don’t go out." Local lifeguards, beach park managers and emergency officials typically coordinate warnings and posting of hazard flags during high surf events; residents should watch for those signals at beaches and coastal access points.

The timing and size of waves carry direct implications for residents and businesses along east-facing coasts. Beachgoers and swimmers face heightened risk of rip currents and large shore-breaks. Commercial and recreational boat operators should account for rough seas near shore and inlets, and coastal property owners should be aware of potential wave impact on shoreline structures. Recreational activities that depend on calm waters will be disrupted while the advisory is in place.

Local authorities and the National Weather Service will continue to monitor the swell and update forecasts as conditions evolve. Residents are advised to follow official channels for real-time information, heed posted ocean safety warnings, and avoid entering the water while the advisory remains active. Community preparedness and adherence to safety guidance reduce risk during transient but powerful ocean conditions that can change quickly along the coast.