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Happisburgh wave buoy daily means for Sep 2017

Daily means from the Happisburgh wave buoy for Sep 2017, 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

553 wave-buoy observations covered 12 of 30 days (40%). Typical wave height was 1.4 ft (10th–90th percentile 0.7–2.1 ft), while mean peak wave period was 5.5 seconds (10th–90th percentile 4–7 seconds). Mean water temperature was 15.4°C (10th–90th percentile 15–15.8°C). All 2,212 checked values passed quality control. Across 4 comparable years, mean wave height was below the same-month mean of 2.2 ft and mean wave period was below the same-month mean of 6.3 seconds.

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

Typical Significant Wave Height

1.4ft
Mean: 1.4 ft
P10–P90: 0.7 — 2.1 ft
Recorded extremes

0.4 — 2.7 ft

Mean Observed Wave Period

5.5secs
P10–P90: 4 — 7secs
Recorded extremes

1.9 — 8.3secs

Observed Wave Direction

NE

Circular concentration: 88%

Mean Water Temperature

15.4°C
P10–P90: 15 — 15.8°C
Recorded extremes

14.9 — 15.9°C

Compared With Previous Septembers

Historical baseline from 5,760 observations across 4 years.

Wave Height
1.4ft
0.8ft below mean
Historical mean 2.198ft
Wave Period
5.5s
0.8s below mean
Historical mean 6.3s
Water Temperature
15.4°C
0.9°C below mean
Historical mean 16.3°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 Sep 2017Last observation shown
Metric
Mean significant wave height (ft)------------------211111222211
Mean peak period (s)------------------565444567677
Mean zero-crossing period (s)------------------444333444444
Mean peak wave direction------------------NNEconcentration 99%NNEconcentration 97%Econcentration 98%NNEconcentration 90%ENEconcentration 90%Econcentration 99%Econcentration 99%NEconcentration 97%NEconcentration 100%NEconcentration 98%NEconcentration 93%NNEconcentration 100%
Mean directional spread (°)------------------31.428.326.340.235.226.426.424.421.521.824.127.5
Mean water temperature(°C)------------------15.215.115.115.115.115.215.315.415.615.715.715.7

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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