SEM-REV - Plateau du Four
France
Last wave reading:
Now at the buoy
Significant wave height at the buoy
2.6 ft
0.8 m
- Dominant period
- —
- Direction
- no direction
This station does not send a swell and wind-wave split, so the numbers are for the whole sea.
Waves: 2.6 ft. Holding steady over the last 6 hours.
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
Over the last 2 days, the model ran 28% high against the buoy.
| Day | Height | Peak period | From |
|---|---|---|---|
| Fri, Nov 13 | 3.3 ft | 5.2 s | E |
| Sat, Nov 14 | 3.5 ft | 5.2 s | ESE |
| Sun, Nov 15 | 10.0 ft | 8.2 s | SW |
| Mon, Nov 16 | 8.9 ft | 9.5 s | WSW |
| Tue, Nov 17 | 13.5 ft | 10 s | WSW |
| Wed, Nov 18 | 11.7 ft | 13 s | W |
| Thu, Nov 19 | 13.1 ft | 15 s | W |
| Fri, Nov 20 | 9.0 ft | 14 s | W |
ECMWF WAM wave model via Open-Meteo, nearest model cell (47.250°N, 2.750°W). Both lines are significant wave height at sea, the same measure the buoy reports. Model output, not a Quiver beach forecast.
Nearby buoys
- Noirmoutier4.3 ftStale · 36 km
- Belle-Ile3.0 ftLive · 38 km
- Ile d'Yeu Nord2.0 ftLive · 59 km
- Pierres-Noires2.0 ftLive · 201 km
- Royan0.3 ftLive · 226 km
- Cherbourg2.6 ftLive · 286 km
How to read this buoy
Biggest hourly reading in that record: 6.6 ft on Nov 11.
- Station id
- 6200078
- Operator
- Cerema; Nantes/St-Nazaire Large Seaport
- Program
- Copernicus Marine In Situ
- Position
- 47.239°N, 2.787°W
- Type
- Moored buoy
- Local time zone
- Europe/Paris
- Swell split
- No, whole-sea numbers only
Source: E.U. Copernicus Marine Service Information; https://doi.org/10.48670/moi-00036. Data from Cerema; Nantes/St-Nazaire Large Seaport. Licence: Copernicus Marine Service licence. Changes: Quiver converts the units (feet, knots, °F) and shows a subset of the published fields.
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.
