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Chapel Point wave buoy daily means for Apr 2021

Daily means from the Chapel Point wave buoy for Apr 2021, 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

1,435 wave-buoy observations covered all 30 days. Typical wave height was 2.7 ft (10th–90th percentile 1.2–5.2 ft), while mean average of more than one wave period type was 7.8 seconds (10th–90th percentile 4.3–12.2 seconds). Mean water temperature was 8.3°C (10th–90th percentile 7.3–9.5°C). 12 of 5,699 checked values (0.2%) were excluded by quality control. Across 7 comparable years, mean wave height was above the same-month mean of 2.5 ft and mean wave period was above the same-month mean of 6.5 seconds.

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

Typical Significant Wave Height

2.7ft
Mean: 3.1 ft
P10–P90: 1.2 — 5.2 ft
Recorded extremes

0.6 — 10.3 ft

Mean Observed Wave Period

7.8secs
P10–P90: 4.3 — 12.2secs
Recorded extremes

1.9 — 15.4secs

Available for 719 of 720 hourly samples

Observed Wave Direction

NE

Circular concentration: 94%

Mean Water Temperature

8.3°C
P10–P90: 7.3 — 9.5°C
Recorded extremes

7.2 — 10.3°C

Compared With Previous Aprils

Historical baseline from 9,406 observations across 7 years.

Wave Height
3.1ft
0.6ft above mean
Historical mean 2.526ft
Wave Period
7.8s
1.3s above mean
Historical mean 6.5s
Water Temperature
8.3°C
0.5°C below mean
Historical mean 8.8°C

Chart showing grouped wave observations for Chapel Point. 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 Chapel Point wave buoy

Chapel Point is a Channel Coastal Observatory wave station off the Lincolnshire coast near Chapel St Leonards. Its shallow North Sea setting records conditions approaching a low-lying, heavily managed sandy frontage north of Skegness, supporting flood and erosion monitoring.

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

Metrics are rows; days run left to right.
Chapel Point wave buoy daily means Apr 2021Last observation shown
Metric
Mean significant wave height (ft)445377642443322212113322322443
Mean maximum wave height (ft)66741011953665543222214533443764
Mean peak period (s)65781011121313121111986755655999564566
Mean zero-crossing period (s)445456655555654444444655443444
Mean energy period (s)------------------------------
Mean wave power, kilowatts per metre------------------------------
Mean peak wave directionNNEconcentration 98%NNEconcentration 98%NNEconcentration 100%NNEconcentration 97%NNEconcentration 99%NNEconcentration 99%NNEconcentration 100%NNEconcentration 100%NNEconcentration 94%NNEconcentration 100%NNEconcentration 98%NNEconcentration 100%NNEconcentration 100%NNEconcentration 100%NNEconcentration 99%NNEconcentration 99%ENEconcentration 94%ENEconcentration 99%NEconcentration 99%NEconcentration 99%NNEconcentration 99%NNEconcentration 100%NNEconcentration 93%NNEconcentration 98%NEconcentration 96%NEconcentration 99%Econcentration 71%ENEconcentration 100%NEconcentration 94%NEconcentration 97%
Mean directional spread (°)24.629.023.123.621.820.220.726.530.024.124.725.021.622.829.129.531.124.624.120.822.518.421.223.733.428.634.725.628.226.5
Mean water temperature(°C)7.97.97.87.97.87.57.37.37.47.37.37.47.57.77.88.08.28.38.58.78.69.29.29.39.49.59.59.49.49.5

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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