Gravelly shoal light
NDBC buoy gslm4
Observed , 1 hour ago
Challenging
Small Craft Advisory in effect. Fresh NNE winds at 18 kn gusting to 21 kn. Air 62°F. Tonight: East Winds 15 To 20 Knots Diminishing To 10 To 15 Knots Early In The Morning.
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 iPhoneSmall Craft Advisory
Small Craft Advisory issued September 23 at 3:35PM EDT until September 23 at 10:00PM EDT by NWS Detroit/Pontiac MI
* WHAT...Expect sustained winds up to 19 knots from the east with gusts up to 25 knots. The largest significant waves will be 4 feet with a potential maximum wave height of 5 feet. * WHERE...Outer Saginaw Bay SW of Alabaster to Port Austin MI to Inner Saginaw Bay, Inner Saginaw Bay SW of Point Au Gres to Bay Port MI, Port Austin to Harbor Beach MI, Harbor Beach to Port Sanilac MI and Port Sanilac to Port Huron MI. * WHEN...The maximum winds are expected around 9 PM EDT Wednesday with the largest waves expected around 9 PM EDT Wednesday. * IMPACTS...Conditions will be hazardous to small craft.
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Get Buoycast for iPhoneWind
Speed
18kn
Gust
21kn
Direction
30° NNE
Trend
Easing
Last 11 hours13 to 22 kn
Air temp
62°F
Last 11 hours58 to 62°F
Pressure
1031mbar
Tendency
Steady
3 hour change
-0.3 mbar
Last 11 hours1031 to 1033 mbar
Zone forecast
Tonight
East Winds 15 To 20 Knots Diminishing To 10 To 15 Knots Early In The Morning. Clear. Waves 2 To 4 Feet.
Thursday
East Winds 10 To 15 Knots. Sunny. Waves 1 To 3 Feet.
Thursday Night
East Winds 10 To 15 Knots Diminishing To 5 To 10 Knots In The Late Evening And Early Morning, Then Veering To The Southeast After Midnight. Mostly Clear. Waves 2 Feet Or Less.
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 9 hours. Pressure 1,031 to 1,033 mbar over the same window.
3 stations within 30 NM
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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.