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Fjaltring wave buoy daily means for Apr 1999

Daily means from the Fjaltring wave buoy for Apr 1999, 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

240 wave-buoy observations covered all 30 days. Typical wave height was 3.2 ft (10th–90th percentile 1–7.7 ft), while mean average of more than one wave period type was 4.8 seconds (10th–90th percentile 3.6–6.2 seconds). All 718 checked values passed quality control.

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

Typical Significant Wave Height

3.2ft
Mean: 3.7 ft
P10–P90: 1 — 7.7 ft
Recorded extremes

0.6 — 12.8 ft

Available for 238 of 240 hourly samples

Mean Observed Wave Period

4.8secs
P10–P90: 3.6 — 6.2secs
Recorded extremes

2.6 — 8.3secs

Typical Observed Wind

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

Available for 0 of 240 hourly samples

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 240 hourly samples

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 1999Last observation shown
Metric
Mean significant wave height (ft)211124854485474438QC rejected332211114QC rejectedQC rejected
Mean maximum wave height (ft)322246147671397126751315544322226910
Mean average period (s)866544654565565555654444333455
Mean zero-crossing period (s)765444554455565445654444333455
Mean peak wave directionNWconcentration 99%NWconcentration 100%NWconcentration 100%NWconcentration 97%SWconcentration 57%SWconcentration 100%Wconcentration 95%NWconcentration 99%Wconcentration 93%Wconcentration 95%WNWconcentration 97%WSWconcentration 76%Wconcentration 92%NWconcentration 99%NWconcentration 99%WSWconcentration 95%WNWconcentration 94%NWconcentration 100%NWconcentration 100%NWconcentration 99%SSWconcentration 84%SWconcentration 88%SWconcentration 100%WSWconcentration 66%Nconcentration 99%Nconcentration 100%NNWconcentration 94%NWconcentration 99%NWconcentration 100%NWconcentration 97%

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.

Observation data source

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

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