Skip to content
Surfhog home
Menu

Fjaltring wave buoy daily means for Aug 2021

Daily means from the Fjaltring wave buoy for Aug 2021, including available wave height, period, direction, wind and sea temperature data.

Last observation shown

Data available:  to 

Monthly means for

Latest

Period Summary

Programmatically generated summary. Hog Says

1,472 wave-buoy observations covered all 31 days. Typical wave height was 3 ft (10th–90th percentile 1.3–6.6 ft), while mean average of more than one wave period type was 4.6 seconds (10th–90th percentile 3.5–5.6 seconds). 1 of 4,309 checked values (0%) were excluded by quality control. Across 11 comparable years, mean wave height was above the same-month mean of 3.4 ft and mean wave period was above the same-month mean of 4.4 seconds.

Generated only from the observations and comparisons shown on this page.

Typical Significant Wave Height

3ft
Mean: 3.7 ft
P10–P90: 1.3 — 6.6 ft
Recorded extremes

0.6 — 9.9 ft

Available for 739 of 742 hourly samples

Mean Observed Wave Period

4.6secs
P10–P90: 3.5 — 5.6secs
Recorded extremes

2.5 — 12.1secs

Typical Observed Wind

-, -mph
Mean: - mph
P10–P90: - — - mph

Available for 0 of 742 hourly samples

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 742 hourly samples

Compared With Previous Augusts

Historical baseline from 16,259 observations across 11 years.

Wave Height
3.7ft
0.3ft above mean
Historical mean 3.445ft
Wave Period
4.6s
0.2s above mean
Historical mean 4.4s
Water Temperature
–
Not enough comparable data

Chart showing grouped wave observations for Fjaltring. Use the table on this page for a text version of the same measurements. To open hourly observations, use a linked day name in the table.

About Fjaltring wave buoy

Fjaltring is a Danish Coastal Authority directional buoy off the exposed central west coast of Jutland. The authority has maintained a continuous wave-measurement programme here since 1980, creating a key reference for Denmark's most erosion-prone coast and the long-running Lodbjerg–Nymindegab protection works.

Its current data source reports wave height, wave period and wave direction.

Metrics are rows; days run left to right.
Fjaltring wave buoy daily means Aug 2021Last observation shown
Metric
Mean significant wave height (ft)66421233QC rejected2234653777431127543224
Mean average wave height (ft)-------------------------------
Mean maximum wave height (ft)10107323558434710851313117522413864446
Mean average period (s)5554334455444554655444447754556
Mean zero-crossing period (s)5544334454334554555443345544445
Mean maximum wave period (s)-------------------------------
Mean peak wave directionNWconcentration 100%NWconcentration 100%NWconcentration 100%NWconcentration 95%SWconcentration 82%SSEconcentration 87%SWconcentration 98%SWconcentration 100%SWconcentration 100%WSWconcentration 100%WSWconcentration 93%SWconcentration 98%SWconcentration 100%WSWconcentration 99%Wconcentration 99%WNWconcentration 96%WNWconcentration 99%NWconcentration 96%WNWconcentration 99%NWconcentration 100%NWconcentration 99%NNWconcentration 93%NWconcentration 92%NWconcentration 100%NWconcentration 100%NWconcentration 95%Nconcentration 99%NNWconcentration 100%NWconcentration 97%NWconcentration 100%NWconcentration 100%

Swipe sideways to see more days.

Wave metric colour key

Colours move through the scale as each number increases. They do not by themselves mean that conditions are good, safe or suitable for you.

Wave & swell height0–40+ ft
Wave & swell period0–22+ s
Wind speed0–75 mph

The displayed numbers remain the source of truth; colour is an additional visual cue.

What does buoy wave power mean?

kW/m means kilowatts of wave power per metre of wave crest. It describes the rate at which the observed sea state carries energy past the buoy.

Unlike the shore-directed forecast value, buoy wave power is the total power at the observation point. It is not projected towards a particular beach and does not predict breaking wave height.

In deep water, wave power can be calculated with:

P is approximately 0.49 times significant wave height squared times wave energy period.

P is power in kW/m, Hs is significant wave height in metres, and Te is wave energy period in seconds.

  • Provider-reported power is used when available.
  • Otherwise, a value is calculated only when both significant height and a genuine energy period are available. The ≈ symbol marks calculated values.
  • A dash is shown instead of substituting peak, Tm02, zero-crossing or other period measurements.
  • Daily and monthly figures use the mean of hourly-normalized observation power values; they are not calculated from mean height and period.

Wave direction, spectrum, water depth and local bathymetry still matter. Wave power is best read alongside height, period and direction rather than as a standalone surf-quality score.

The observation data displayed on this page is from the Danish Coastal Authority wave-measurement network.

Learn how SurfHog combines, checks and summarizes observations in the data and methodology notes.

› Wave Buoy List