The largest wave ever recorded in the Southern Hemisphere

A massive wave reaching an astonishing height of 78 feet (23.8 meters) has been recorded in the Southern Ocean, marking the largest wave ever measured in the Southern Hemisphere.

The extraordinary event occurred on May 9, 2018, during a powerful storm near Campbell Island, approximately 692 kilometers south of New Zealand. Scientists describe the event as a major breakthrough in understanding extreme ocean conditions.

According to oceanographer Tom Durrant from MetOcean Solutions, the storm provided a rare opportunity to capture valuable data about wave behavior under extreme conditions.

How the giant wave was recorded

The wave was detected by a solar-powered buoy operated by MetOcean Solutions, which measures wave activity at regular intervals.

The buoy collects data such as wave height, direction, and period for short durations every few hours, transmitting the information via satellite. During the storm, the recorded wave reached 78 feet, but scientists believe even larger waves may have occurred.

Forecast models suggest that some waves during the same storm may have reached heights of up to 82 feet (25 meters).

Why the Southern Ocean produces extreme waves

The Southern Ocean is one of the most powerful and least-studied marine environments on Earth. Strong, persistent winds circle the region, making it a global “engine” for wave generation.

These waves can travel vast distances across the oceans, even influencing wave conditions along distant coastlines such as California.

The storm that generated the record wave was caused by a deep low-pressure system, accompanied by winds reaching 65 knots (120 km/h), conditions that are common in this region throughout the year.

Understanding wave measurements

Oceanographers use a key metric known as “significant wave height” to describe sea conditions. This value represents the average height of the highest one-third of waves in a given period.

During the May 9 storm, the significant wave height reached 48.9 feet (14.9 meters), setting a new record for the Southern Ocean.

However, this is not the highest ever recorded globally. That record still belongs to a North Atlantic storm in 2013, where the significant wave height reached 62 feet (19 meters).

A rare glimpse into extreme ocean dynamics

Events like this provide critical insight into how oceans behave under extreme weather conditions. Scientists emphasize that such measurements help improve forecasting models and deepen our understanding of wave physics.

The Southern Ocean remains one of the least explored regions on the planet, and each new observation brings valuable knowledge about the forces shaping Earth’s oceans.