How Saildrones Gather Data Inside a Hurricane

How does a saildrone collect data in a hurricane?

A saildrone is an uncrewed surface vehicle: a boat-like craft that travels on the ocean without a crew aboard. Saildrone, a company based in Alameda, California, designs and operates these vehicles. ⁴

For the Isaias mission, company pilots directed SD-1045 from a control room in Alameda toward the storm. The craft carried a camera, and the reports describe it recording wind and wave conditions as it crossed the hurricane. The sources do not give a full list of its instruments or explain their exact arrangement. ¹³

What did SD-1045 encounter in Hurricane Isaias?

A report says the 23-foot craft was about 150 nautical miles south of Pensacola when Isaias approached. SD-1045 entered the northern side of the hurricane, crossed its eye and emerged on the other side. ¹

Saildrone reported gusts above 103 miles per hour and waves as high as 65 feet during the passage. These are reported measurements from the mission, not a guarantee that every part of the storm had the same conditions. A second saildrone, SD-1057, took a different route on the storm’s eastern side, according to the same report. ¹

Why send an uncrewed boat into a storm?

The central advantage is that a saildrone can gather observations in hazardous conditions without placing a crew on the vessel. A storm’s ocean conditions matter to researchers, and measurements taken within the storm can provide information that is difficult to collect from a crewed boat. The reports say the data could help improve hurricane forecasting, but they do not quantify its effect. ¹³

This does not mean the craft makes a hurricane predictable by itself. It is one source of observations, and the available reporting does not describe how researchers combine this mission’s data with other measurements or forecasts.

How is saildrone data different from storm surge data?

Storm surge is the rise of coastal water associated with a storm. A separate team tested newly developed, 3D-printed weather stations and rapidly deployed surge sensors as Isaias came ashore. The report says those sensors sent data in real time to the National Hurricane Center and would be assessed as a case study. ²

That coastal sensor project should not be confused with the saildrone mission at sea. Both involved collecting storm observations, but the sources describe different equipment and different settings: saildrone measurements offshore, and surge sensors monitoring water near the coast. ¹²

What is still uncertain about the mission?

The reports describe dramatic conditions and measurements, but they do not provide the full dataset, a detailed account of the instruments used, or an independent analysis of the readings. They also do not show how much the data changed a forecast or whether the separate surge-sensor technology will prove useful in future storms. ¹²³

Those limits matter: one mission can contribute observations, but its practical value depends on how researchers check, interpret and use the data. The supplied reports do not settle that question.