The project “Meteorological Monitoring and Crossing Risk Assessment in the Drake Passage” aims to provide sailors, expedition operators, researchers, and Antarctic travelers with a practical and accessible decision-support framework for identifying safer navigation windows across one of the most challenging maritime regions in the world. By integrating atmospheric observations, operational meteorology, and conventional forecasting techniques, the project contributes to improving voyage planning, maritime safety, and operational efficiency during Antarctic expeditions.
In recent years, Antarctica has experienced a substantial increase in tourism activity. According to the International Association of Antarctica Tour Operators (IAATO), approximately 50,000 visitors travel annually during the austral summer aboard expedition ships and sailing vessels departing mainly from Ushuaia, Argentina, and Punta Arenas, Chile, toward the Antarctic Peninsula. Most travelers originate from countries such as the United States, Australia, Germany, and the United Kingdom, attracted by the continent’s unique landscapes, biodiversity, and scientific importance.
Despite the growing popularity of Antarctic expeditions, crossing the Drake Passage remains one of the greatest challenges of the journey. Located at the confluence of the Southern Ocean, Pacific Ocean, and Atlantic Ocean, the Drake Passage is recognized as one of the stormiest maritime regions on Earth. The region is constantly influenced by intense cyclonic systems, including explosive cyclogenesis events (“bomb cyclones”), capable of generating waves exceeding 10 meters and winds stronger than 50 knots.
Due to the absence of islands or sheltered coastal regions throughout the crossing, navigation in the Drake Passage requires careful operational planning, adequate vessels, experienced crews, and continuous meteorological monitoring. Assessing atmospheric and oceanic conditions before and during the crossing is essential to reduce navigational risks and improve passenger safety and comfort.
In addition to traditional meteorological products — including numerical weather prediction models, wave forecasts, satellite imagery, and synoptic charts — this project also incorporates a practical methodology developed by the Chilean Navy for evaluating crossing conditions in the Drake Passage through atmospheric pressure gradient analysis.
The methodology is based on the atmospheric pressure difference between the meteorological stations of Ushuaia (87938) and Carlini Station, Antarctica (89053). In general, the smaller the pressure difference between the two stations, the calmer the meteorological and oceanic conditions in the Drake Passage tend to be. Conversely, larger pressure gradients are commonly associated with stronger winds, rougher seas, and greater storm activity.
In general, crossings should be avoided whenever the atmospheric pressure difference equals or exceeds 12 hPa, as these conditions are frequently associated with hazardous sea states and severe weather conditions.
It is important to emphasize that the Drake Crossing Index does not replace conventional meteorological and oceanographic analyses. Instead, it serves as a complementary operational tool to support crossing decisions alongside weather models, wave forecasts, and synoptic analyses.
Furthermore, after prolonged periods of severe weather, sea conditions may remain highly agitated even when the atmospheric pressure gradient weakens. Therefore, it is recommended that vessels wait at least 12 hours after significant weather improvement before initiating the crossing, allowing sufficient time for ocean conditions to stabilize.
