Gravelly Shoal Light, MI (GSLM4) — Live Marine Conditions & Buoy Data
NOAA station GSLM4, Gravelly Shoal Light, MI, reports real-time marine conditions from 44.018°N, 83.537°W in Lake Huron (Michigan). Readings refresh roughly every 10 minutes, and Big Buoy adds a solunar table and a multi-day weather outlook for the area.
Lake Huron Marine Conditions — Gravelly Shoal Light, MI is one of several stations in Lake Huron. See live buoy data and solunar for the whole area.
Current conditions at Gravelly Shoal Light, MI
As of October 19, 2026 at 19:40 UTC, Gravelly Shoal Light, MI (GSLM4) is reporting air temperature 59°F, wind from the SSE at 13 mph gusting 14 mph, and barometric pressure 30.36 inHg.
- Air temperature
- 59°F
- Wind
- SSE 13 mph (gust 14)
- Barometric pressure
- 30.36 inHg
Observed October 19, 2026 at 19:40 UTC from NOAA NDBC station GSLM4. Readings update about every 10 minutes.
What NOAA buoy GSLM4 measures
As a NOAA meteorological station, GSLM4 reports wind speed, gusts and direction, barometric pressure, air and water temperature, and — where wave sensors are fitted — significant wave height, swell period, and wave direction.
What to watch in Lake Huron
Lake Huron pairs a big open main basin with the sheltered waters of Georgian Bay and the North Channel, so conditions vary a lot with where you are. The open lake builds steep, short-period seas on a sustained blow — check the buoy nearest your water and mind the wind direction.
Frequently asked questions
- What is the air temperature at Gravelly Shoal Light?
- Air temperature at Gravelly Shoal Light was 59°F. Measured October 19, 2026 at 19:40 UTC by NOAA station GSLM4 (Gravelly Shoal Light, MI).
- What is the wind doing at Gravelly Shoal Light?
- Wind at Gravelly Shoal Light was from the SSE at 13 mph, with peak gusts to 14 mph. Measured October 19, 2026 at 19:40 UTC by NOAA station GSLM4 (Gravelly Shoal Light, MI). NDBC records wind at the station’s anemometer height, which is not the 10 m height used in marine forecasts.
- What is the barometric pressure at Gravelly Shoal Light?
- Sea-level pressure at Gravelly Shoal Light was 30.36 inHg (1028.1 hPa). Measured October 19, 2026 at 19:40 UTC by NOAA station GSLM4 (Gravelly Shoal Light, MI). NDBC reports pressure reduced to sea level rather than the raw reading at the station.
- Where is NOAA buoy GSLM4 located?
- Gravelly Shoal Light, MI (GSLM4) reports from 44.018°N, 83.537°W in Lake Huron (Michigan).
- How often is NOAA buoy GSLM4 updated?
- Station GSLM4 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 GSLM4 measure?
- Big Buoy shows wind, barometric pressure, air and water temperature, and wave height and period where available for Gravelly Shoal Light, MI, plus solunar peak windows and a multi-day weather outlook.
- Is Big Buoy free to use?
- Yes. Live data for Gravelly Shoal Light, 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.