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Fjaltring wave buoy daily means for Apr 2018

Daily means from the Fjaltring wave buoy for Apr 2018, 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

1,440 wave-buoy observations covered all 30 days. Typical wave height was 2.1 ft (10th–90th percentile 1–4 ft), while mean average of more than one wave period type was 4.2 seconds (10th–90th percentile 3.2–5.2 seconds). All 4,310 checked values passed quality control. Across 8 comparable years, mean wave height was below the same-month mean of 3.6 ft and mean wave period was below the same-month mean of 4.8 seconds.

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

Typical Significant Wave Height

2.1ft
Mean: 2.4 ft
P10–P90: 1 — 4 ft
Recorded extremes

0.5 — 9.3 ft

Mean Observed Wave Period

4.2secs
P10–P90: 3.2 — 5.2secs
Recorded extremes

2.3 — 6.3secs

Typical Observed Wind

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

Available for 0 of 720 hourly samples

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 720 hourly samples

Compared With Previous Aprils

Historical baseline from 9,723 observations across 8 years.

Wave Height
2.4ft
1.2ft below mean
Historical mean 3.609ft
Wave Period
4.2s
0.6s below mean
Historical mean 4.8s
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 Apr 2018Last observation shown
Metric
Mean significant wave height (ft)132245211333321113112135434222
Mean average wave height (ft)------------------------------
Mean maximum wave height (ft)343488322454542125223249767444
Mean average period (s)443455454444455434544445545544
Mean zero-crossing period (s)343455444343454434533435545444
Mean maximum wave period (s)------------------------------
Mean peak wave directionNNWconcentration 94%NWconcentration 100%SWconcentration 43%WSWconcentration 99%WNWconcentration 92%NWconcentration 100%SSWconcentration 82%NWconcentration 97%NWconcentration 99%NNWconcentration 96%Nconcentration 99%Nconcentration 97%NNWconcentration 96%Nconcentration 97%WNWconcentration 97%WNWconcentration 97%SWconcentration 90%WSWconcentration 95%WNWconcentration 95%NWconcentration 99%NWconcentration 94%NWconcentration 99%SWconcentration 90%Wconcentration 99%Wconcentration 98%Wconcentration 95%WSWconcentration 100%WNWconcentration 92%NWconcentration 100%NWconcentration 98%

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.

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