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Fjaltring wave buoy daily means for May 1999

Daily means from the Fjaltring wave buoy for May 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

247 wave-buoy observations covered all 31 days. Typical wave height was 2.6 ft (10th–90th percentile 1.1–5 ft), while mean average wave period was 4.3 seconds (10th–90th percentile 3.2–5.4 seconds). All 740 checked values passed quality control.

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

Typical Significant Wave Height

2.6ft
Mean: 2.8 ft
P10–P90: 1.1 — 5 ft
Recorded extremes

0.7 — 8.1 ft

Mean Observed Wave Period

4.3secs
P10–P90: 3.2 — 5.4secs
Recorded extremes

2.6 — 8secs

Typical Observed Wind

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

Available for 0 of 247 hourly samples

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 247 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 May 1999Last observation shown
Metric
Mean significant wave height (ft)QC rejected321111233223223311126754532453
Mean maximum wave height (ft)853222235433544552223101198863685
Mean average period (s)5543333344444444555445555554455
Mean zero-crossing period (s)5433333344444334545345555554455
Mean peak wave directionNWconcentration 100%NWconcentration 100%NWconcentration 99%NWconcentration 99%Variableconcentration 21%SSEconcentration 57%SWconcentration 60%ESEconcentration 76%SWconcentration 98%WNWconcentration 80%WNWconcentration 79%Wconcentration 94%NNWconcentration 87%Nconcentration 100%NNWconcentration 98%NWconcentration 98%NWconcentration 100%NWconcentration 99%NWconcentration 99%NWconcentration 99%Wconcentration 68%WSWconcentration 95%Wconcentration 95%WSWconcentration 97%Wconcentration 96%Wconcentration 91%WSWconcentration 99%Wconcentration 58%WSWconcentration 89%NWconcentration 97%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.

Observation data source

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

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