South Entry Buoy, South Keweenaw Peninsula, MI
Michigan, United States
Last wave reading:
Last reading
This reading is more than 3 hours old. The buoy may have stopped sending waves for now.
Significant wave height at the buoy
0.3 ft
0.1 m
- Dominant period
- —
- Direction
- from WNW 283°
This reading came without the swell and wind-wave split, so the numbers are for the whole sea.
Close to flat at the buoy: 0.3 ft of total wave height.
Significant wave height is the average of the biggest third of waves at the buoy. It is not surf height at a beach.
Trend at the buoy
Height at the buoy
- Total (significant height)
Period
- Dominant period
Hourly means of the buoy's readings. Arrows point the way the waves travel.
Model vs the buoy
- Buoy, hourly
- Model, past days
- Model forecast
| Day | Height | Peak period | From |
|---|---|---|---|
| Fri, Nov 13 | 3.4 ft | 5.8 s | NE |
| Sat, Nov 14 | 2.3 ft | 5.6 s | NE |
| Sun, Nov 15 | 1.2 ft | 2.4 s | SW |
| Mon, Nov 16 | 1.9 ft | 3.1 s | SW |
| Tue, Nov 17 | 2.0 ft | 3.2 s | SW |
| Wed, Nov 18 | 1.8 ft | 3 s | SW |
| Thu, Nov 19 | 1.3 ft | 2.5 s | SSW |
ECMWF WAM wave model via Open-Meteo, nearest model cell (47.000°N, 88.250°W). Both lines are significant wave height at sea, the same measure the buoy reports. Model output, not a Quiver beach forecast.
Nearby buoys
- North Entry Buoy, North Keweenaw Peninsula, MI0.7 ftStale · 37 km
- Ontonagon, MI0.3 ftStale · 73 km
- West Superior - 30NM NE of Outer Island, WI3.3 ft · 6 sLive · 113 km
- Mid Superior - 60 NM North Northeast Hancock, MI4.3 ft · 5 sLive · 130 km
- Grand Island North, MI0.7 ftStale · 139 km
- East Superior -70 NM NE Marquette, MI4.9 ft · 6 sLive · 153 km
Other readings
- Water temperature
- 55°F (12.8°C)
- Wind
- 6 kt from the WNW, gusts 10 kt
- Air temperature
- 50°F (10.2°C)
- Pressure
- 1021.5 hPa
Reported Oct 14, 1:00 PM EDT.
How to read this buoy
Biggest hourly reading in that record: 1.3 ft on Oct 13.
- Station id
- 45025
- Operator
- Michigan Technological University
- Program
- IOOS Partners
- Position
- 46.969°N, 88.398°W
- Type
- Moored buoy
- Local time zone
- America/Detroit
- Swell split
- Yes, swell and wind waves reported
Source: NOAA National Data Buoy Center (NDBC); station operated by Michigan Technological University. Licence: Public domain (US government work). Station page at the source.
Not for navigation. Readings can be late, missing or wrong; check official marine forecasts before going to sea.
Buoy terms
- Significant height
- The average of the biggest third of waves the buoy measured. Sets in the surf zone can be bigger or smaller.
- Dominant period
- Seconds between the waves carrying the most energy. Longer period means more power and more bend around points.
- Swell vs wind waves
- Swell was made by distant wind; wind waves were made nearby. The buoy splits its spectrum at a cutoff period to report each.
- Direction
- Where waves come from, in degrees true. 270° is from the west.
