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Happisburgh wave buoy daily means for May 2013

Daily means from the Happisburgh wave buoy for May 2013, 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

1,488 wave-buoy observations covered all 31 days. Typical wave height was 1.9 ft (10th–90th percentile 0.9–4.4 ft), while mean peak wave period was 6.3 seconds (10th–90th percentile 4–10.5 seconds). Mean water temperature was 10.9°C (10th–90th percentile 10.2–11.6°C). 9 of 5,949 checked values (0.2%) were excluded by quality control. Across 1 comparable year, mean wave height was below the same-month mean of 2.3 ft and mean wave period was the same as the same-month mean of 6.3 seconds.

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

Typical Significant Wave Height

1.9ft
Mean: 2.2 ft
P10–P90: 0.9 — 4.4 ft
Recorded extremes

0.3 — 7.3 ft

Mean Observed Wave Period

6.3secs
P10–P90: 4 — 10.5secs
Recorded extremes

1.9 — 15.4secs

Available for 743 of 744 hourly samples

Observed Wave Direction

NNE

Circular concentration: 83%

Mean Water Temperature

10.9°C
P10–P90: 10.2 — 11.6°C
Recorded extremes

9.3 — 11.9°C

Compared With Previous Mays

Historical baseline from 1,090 observations across 1 year.

Wave Height
2.2ft
0.1ft below mean
Historical mean 2.329ft
Wave Period
6.3s
In line with the historical mean
Historical mean 6.3s
Water Temperature
10.9°C
0.9°C below mean
Historical mean 11.8°C

Chart showing grouped wave observations for Happisburgh. 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 Happisburgh wave buoy

Happisburgh is a Channel Coastal Observatory wave station off the northeast Norfolk coast. It supplies a nearshore North Sea record for one of England's most rapidly changing soft-cliff frontages, where communities, beaches and coastal defences are exposed to frequent erosion.

Its current data source reports wave height, wave period, wave direction, directional spread and sea temperature.

Metrics are rows; days run left to right.
Happisburgh wave buoy daily means May 2013Last observation shown
Metric
Mean significant wave height (ft)2221111111121122432454543322333
Mean peak period (s)1068117594565544656775677105775555
Mean zero-crossing period (s)4444434334444443455445554553444
Mean peak wave directionNNEconcentration 98%ENEconcentration 92%NEconcentration 95%NNEconcentration 99%NEconcentration 73%ENEconcentration 72%NNEconcentration 87%ENEconcentration 95%ENEconcentration 85%NEconcentration 81%NEconcentration 88%Nconcentration 89%Nconcentration 88%NEconcentration 70%Econcentration 91%ENEconcentration 76%NNEconcentration 94%NNEconcentration 99%NNEconcentration 99%Nconcentration 99%Nconcentration 100%NNEconcentration 99%Nconcentration 98%NNEconcentration 95%NNEconcentration 96%NNEconcentration 100%NEconcentration 95%ENEconcentration 96%NEconcentration 88%NNEconcentration 99%Nconcentration 97%
Mean directional spread (°)27.227.629.133.527.938.449.533.432.638.943.834.236.938.325.730.422.522.122.923.119.622.520.523.328.421.426.225.026.527.926.1
Mean water temperature(°C)9.69.810.110.310.510.710.911.111.211.111.111.011.010.910.910.810.810.710.910.910.911.011.010.910.811.011.311.611.711.711.6

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 Regional Coastal Monitoring Programme.

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

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