Gravelly shoal light
NDBC buoy gslm4
Observed , 2 hours ago
Elevated
Moderate W winds at 13 kn gusting to 15 kn. Air 60°F. Tonight: Northwest winds 10 to 15 knots becoming light and variable.
It tells you it is rough now. The app tells you before it gets rough, with alerts at the wind and wave limits you set.
Get Buoycast for iPhoneWind
Speed
13kn
Gust
15kn
Direction
270° W
Last 2 hours12 to 21 kn
Air temp
60°F
Last 2 hours60 to 61°F
Pressure
1014mbar
Last 2 hours1013 to 1014 mbar
Zone forecast
Tonight
Northwest winds 10 to 15 knots becoming light and variable. Clear in the evening becoming partly cloudy. Waves 2 feet or less.
Wednesday
West winds 5 to 10 knots backing to the east early in the afternoon. Mostly cloudy. A chance of light rain in the late morning and afternoon. Waves 2 feet or less.
Wednesday Night
Northeast winds 10 to 15 knots becoming north 20 to 25 knots. Light rain likely until early morning, then light rain after midnight. Waves 2 feet or less building to 6 to 9 feet. Waves occasionally around 12 feet. A small craft advisory may be needed.
NWS zone Outer Saginaw Bay SW of Alabaster to Port Austin MI to Inner Saginaw Bay
Last 24 hours
Every 3 hours, over the last 0 hours. Pressure 1,013 to 1,014 mbar over the same window.
3 stations within 30 NM
These are your in one place. Save the ones you run and Buoycast opens on them.
Get Buoycast for iPhoneCommon questions
How often does buoy gslm4 report?
Wind, temperature and pressure update about every 10 minutes.
Can I be notified when conditions change at buoy gslm4?
Buoycast Pro lets you set your own limits on wind, waves or pressure and sends a threshold notification when this buoy crosses them.
Does this page show NOAA warnings for this area?
Watches, warnings, and advisories for Outer Saginaw Bay SW of Alabaster to Port Austin MI to Inner Saginaw Bay appear alongside the conditions, here and in the app. Pro also pushes NOAA watches, warnings, and advisories when they are issued.
Can I see the forecast against what buoy gslm4 measured?
This page shows measurements only. Buoycast Pro charts the NOAA forecast against them so you can see where the two diverge.
Can I keep buoy gslm4 for next time?
Save it as a favorite and Buoycast opens on the buoys you run.
What this buoy measures
This buoy is not reporting waves or water temperature. Conditions above come from the sensors it does carry, and the forecast, tides and sun times on this page are regional rather than measured at the buoy.
Station gslm4
44°01'05" N 83°32'13" W · owned and maintained by NWS Central Region
Measured on the water by 1,000+ NOAA buoys. Observations from the National Data Buoy Center, forecasts and advisories from the National Weather Service. Not for navigation.