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Happisburgh wave buoy daily means for Apr 2020

Daily means from the Happisburgh wave buoy for Apr 2020, 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

1,427 wave-buoy observations covered all 30 days. Typical wave height was 1.9 ft (10th–90th percentile 0.7–4.7 ft), while mean average of more than one wave period type was 7.1 seconds (10th–90th percentile 3.8–11.3 seconds). Mean water temperature was 9.3°C (10th–90th percentile 7.3–10.9°C). 26 of 5,600 checked values (0.5%) were excluded by quality control. Across 6 comparable years, mean wave height was above the same-month mean of 2.2 ft and mean wave period was above the same-month mean of 6.2 seconds.

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

Typical Significant Wave Height

1.9ft
Mean: 2.3 ft
P10–P90: 0.7 — 4.7 ft
Recorded extremes

0.3 — 7.9 ft

Available for 714 of 715 hourly samples

Mean Observed Wave Period

7.1secs
P10–P90: 3.8 — 11.3secs
Recorded extremes

1.7 — 25secs

Available for 709 of 715 hourly samples

Observed Wave Direction

NE

Circular concentration: 89%

Mean Water Temperature

9.3°C
P10–P90: 7.3 — 10.9°C
Recorded extremes

7 — 11.9°C

Available for 714 of 715 hourly samples

Compared With Previous Aprils

Historical baseline from 8,636 observations across 6 years.

Wave Height
2.3ft
0.1ft above mean
Historical mean 2.165ft
Wave Period
7.1s
0.9s above mean
Historical mean 6.2s
Water Temperature
9.3°C
0.4°C above mean
Historical mean 8.9°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 Apr 2020Last observation shown
Metric
Mean significant wave height (ft)224221111211642143456421211221
Mean peak period (s)68101275451161011899755677764775597
Mean zero-crossing period (s)545544434444555444445443543344
Mean peak wave directionNNEconcentration 99%Nconcentration 96%NNEconcentration 96%NNEconcentration 99%ENEconcentration 79%ENEconcentration 90%ENEconcentration 91%ENEconcentration 95%NEconcentration 92%NEconcentration 94%NNEconcentration 93%NNEconcentration 89%NNEconcentration 99%NNEconcentration 99%NNEconcentration 83%NEconcentration 86%ENEconcentration 100%NEconcentration 98%NEconcentration 99%ENEconcentration 100%ENEconcentration 100%ENEconcentration 100%ENEconcentration 100%NNEconcentration 90%NNEconcentration 99%NNEconcentration 97%Nconcentration 97%NEconcentration 93%NNEconcentration 95%NEconcentration 82%
Mean directional spread (°)24.224.320.924.824.029.841.540.546.128.337.443.522.423.526.430.224.429.524.421.520.521.926.338.523.528.632.033.928.130.3
Mean water temperature(°C)7.17.17.37.47.67.98.18.48.78.89.19.49.39.39.39.49.59.59.59.79.810.010.410.510.811.011.010.910.810.9

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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