Knolls Grund
Sweden
Last wave reading:
Now at the buoy
Significant wave height at the buoy
5.8 ft
1.8 m
- Dominant period
- 5.6 s
- Direction
- from NNW 326°
This station does not send a swell and wind-wave split, so the numbers are for the whole sea.
Short-period wind chop: 5.8 ft at 5.6 s from the NNW. 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 3 days, the model tracked the buoy within 10%.
| Day | Height | Peak period | From |
|---|---|---|---|
| Fri, Nov 13 | 7.0 ft | 6 s | NW |
| Sat, Nov 14 | 6.7 ft | 6 s | NW |
| Sun, Nov 15 | 7.9 ft | 6.8 s | S |
| Mon, Nov 16 | 9.5 ft | 7.5 s | S |
| Tue, Nov 17 | 7.0 ft | 7.5 s | SSW |
| Wed, Nov 18 | 3.9 ft | 6.6 s | SSW |
| Thu, Nov 19 | 2.8 ft | 4 s | NW |
| Fri, Nov 20 | 2.8 ft | 4.1 s | NW |
ECMWF WAM wave model via Open-Meteo, nearest model cell (57.500°N, 17.500°E). Both lines are significant wave height at sea, the same measure the buoy reports. Model output, not a Quiver beach forecast.
Nearby buoys
- Huvudskär OstOffline · 182 km
- Northern Baltic Proper6.6 ft · 7.7 sLive · 275 km
How to read this buoy
Over the readings shown here, most wave energy reached this buoy from the S.
Biggest hourly reading in that record: 7.1 ft at 7.7 s on Nov 13.
- Station id
- 33008
- Operator
- SMHI
- Program
- SMHI oceanographic observations
- Position
- 57.517°N, 17.617°E
- Type
- Moored buoy
- Local time zone
- GMT+1 (open ocean)
- Swell split
- No, whole-sea numbers only
Source: SMHI (Swedish Meteorological and Hydrological Institute). Licence: CC BY 4.0. 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.
