Grand Island North, 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
0.7 ft
0.2 m
- Dominant period
- —
- Direction
- no direction
Swell
0.0 ft0.0 m
25 sfrom E 90°
Wind waves
0.7 ft0.2 m
2.5 sfrom NNE 23°
Close to flat at the buoy: 0.7 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)
- Swell
- Wind waves
Period
- Swell period
- Wind-wave 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 | 6.3 ft | 6.1 s | NNE |
| Sat, Nov 14 | 5.2 ft | 5.7 s | N |
| Sun, Nov 15 | 2.4 ft | 4.2 s | NNW |
| Mon, Nov 16 | 3.3 ft | 4.1 s | SW |
| Tue, Nov 17 | 3.1 ft | 4.2 s | SW |
| Wed, Nov 18 | 3.7 ft | 4.4 s | SSW |
| Thu, Nov 19 | 3.1 ft | 4.2 s | SSW |
ECMWF WAM wave model via Open-Meteo, nearest model cell (47.000°N, 86.500°W). Both lines are significant wave height at sea, the same measure the buoy reports. Model output, not a Quiver beach forecast.
Nearby buoys
- East Superior -70 NM NE Marquette, MI4.9 ft · 6 sLive · 68 km
- East Superior Spotter5.2 ft · 5 sLive · 68 km
- South Entry Buoy, South Keweenaw Peninsula, MI0.3 ftStale · 139 km
- Mid Superior - 60 NM North Northeast Hancock, MI4.3 ft · 5 sLive · 152 km
- North Entry Buoy, North Keweenaw Peninsula, MI0.7 ftStale · 158 km
- Slate Island3.0 ft · 4 sStale · 177 km
Other readings
- Water temperature
- 52°F (11.2°C)
Reported Oct 22, 8:56 AM EDT.
How to read this buoy
Over the readings shown here, most wave energy reached this buoy from the N.
Biggest hourly reading in that record: 12.8 ft at 9 s on Oct 16.
- Station id
- 45211
- CDIP id
- 268
- Operator
- SCRIPPS
- Program
- IOOS Partners
- Position
- 46.973°N, 86.568°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 SCRIPPS. 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.
