Superior Grand Traverse Bay, MI (GTRM4) — Live Marine Conditions & Buoy Data
NOAA station GTRM4, Superior Grand Traverse Bay, MI, reports real-time marine conditions from 47.179°N, 88.241°W in Lake Superior (Michigan). Readings refresh roughly every 10 minutes, and Big Buoy adds a solunar table and a multi-day weather outlook for the area.
Lake Superior Marine Conditions — Superior Grand Traverse Bay, MI is one of several stations in Lake Superior. See live buoy data and solunar for the whole area.
What NOAA buoy GTRM4 measures
Station GTRM4 does not report a full meteorological suite; Big Buoy shows the observations available at this location and pairs it with the nearest offshore buoy so you still get a complete picture of the area.
What to watch in Lake Superior
Lake Superior is the coldest, deepest, and largest of the Great Lakes, with enough open water and fetch to build true offshore seas. Water stays cold most of the year and storms move through fast, so a sustained blow can raise steep, short-period waves with little warning — read wind, fetch, and sea state together before heading out.
Frequently asked questions
- Where is NOAA buoy GTRM4 located?
- Superior Grand Traverse Bay, MI (GTRM4) reports from 47.179°N, 88.241°W in Lake Superior (Michigan).
- How often is NOAA buoy GTRM4 updated?
- Station GTRM4 typically reports new observations about every 10 minutes. Big Buoy refreshes continuously so you always see the latest readings, alongside a solunar table for the area.
- What does NOAA buoy GTRM4 measure?
- Big Buoy shows the observations available at this location, plus the nearest offshore buoy for Superior Grand Traverse Bay, MI, plus solunar peak windows and a multi-day weather outlook.
- Is Big Buoy free to use?
- Yes. Live data for Superior Grand Traverse Bay, MI and every other NOAA buoy is free with no account required. Big Buoy Pro adds the Wind Tab, the Depth Chart, satellite overlays (sea surface temp, chlorophyll, currents), 16-day forecasts, and forecast model switching.