GB17 - South Green Bay, WI
Wisconsin, 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
2.6 ft
0.8 m
- Dominant period
- 4 s
- Direction
- from WSW 244°
This reading came without the swell and wind-wave split, so the numbers are for the whole sea.
Short-period wind chop: 2.6 ft at 4 s from the WSW.
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 | 3.1 ft | 3.9 s | N |
| Sat, Nov 14 | 2.1 ft | 3.2 s | NNW |
| Sun, Nov 15 | 1.0 ft | 2.4 s | N |
| Mon, Nov 16 | 1.5 ft | 2.8 s | SW |
| Tue, Nov 17 | 1.6 ft | 2.9 s | SW |
| Wed, Nov 18 | 1.8 ft | 3.1 s | SSW |
| Thu, Nov 19 | 1.9 ft | 3.2 s | SSW |
ECMWF WAM wave model via Open-Meteo, nearest model cell (44.750°N, 87.750°W). Both lines are significant wave height at sea, the same measure the buoy reports. Model output, not a Quiver beach forecast.
Nearby buoys
- Rawley Point East, WI7.2 ft · 7 sLive · 100 km
- North Michigan - Halfway between North Manitou and Washington Islands.1.0 ft · 2 sStale · 122 km
- Ludington Buoy, MIOffline · 131 km
- Sleeping Bear Dunes0.0 ftStale · 153 km
- ATW20 - Atwater Park, WI6.2 ft · 8 sLive · 189 km
- Muskegon Buoy, MI2.0 ft · 4 sLive · 211 km
Other readings
- Water temperature
- 58°F (14.6°C)
- Wind
- 17 kt from the SSW, gusts 23 kt
- Air temperature
- 60°F (15.8°C)
Reported Oct 18, 6:30 PM CDT.
How to read this buoy
Over the readings shown here, most wave energy reached this buoy from the W and SW.
Biggest hourly reading in that record: 3.6 ft at 4 s on Oct 18.
- Station id
- 45014
- Operator
- University of Wisconsin-Milwaukee
- Program
- IOOS Partners
- Position
- 44.794°N, 87.758°W
- Type
- Moored buoy
- Local time zone
- America/Chicago
- Swell split
- Yes, swell and wind waves reported
Source: NOAA National Data Buoy Center (NDBC); station operated by University of Wisconsin-Milwaukee. 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.
