High-Frequency Radar

A live snapshot of lake surface currents, 24 hours a day.

New to the Great Lakes, HF radar measures surface currents like no other platform can: over large areas.

When studying currents, researchers are typically limited to a device that measures only one point in the water.

By capturing extremely detailed, near-surface water direction and speed information, this platform allows observers to:

Locate people or pets during search and rescue operations
Track vessels
Monitor movements of hazardous spills or harmful algal blooms
Understand how water moves through complex waterways, like in the Straits of Mackinac

Photos by Nathan Shaiyan, Michigan Technological University, unless otherwise noted.

Data collected May 2022: Arrows indicate the direction and speed of the surface current.

See the Latest Data

HF radar will be available on Seagull soon.

Data Visualization of High Frequency Radar

HF radars are shore-based remote sensing systems made up of antennas, generally used in pairs and placed close to the water’s edge.

The antennas send out pulses of high-frequency radio waves that bounce off the water’s surface and back to the antenna. By measuring how the waves bounce back, the radar is able to create a map detailing the speed and direction of surface currents.

Because saltwater allows HF radar to work over much larger areas, coastal waters have long benefited from HF radar, but the Great Lakes are just beginning to use it. Even the reduced range, reaching 10-15 miles in some tests by Dr. Lorelle Meadows, can be enough for many areas.

The first HF radar in the Great Lakes is located in the Straits of Mackinac where, operated by Michigan Technological University Great Lakes Research Center, a single radar pair covers the waters on the west side of the Mackinac Bridge.

Learn more about the project.