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Chesil wave buoy daily means for Aug 2016

Daily means from the Chesil wave buoy for Aug 2016, 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 2.1 ft (10th–90th percentile 0.9–5.3 ft), while mean average of more than one wave period type was 6.7 seconds (10th–90th percentile 3.8–10 seconds). Mean water temperature was 17.5°C (10th–90th percentile 16.9–18°C). 15 of 5,902 checked values (0.3%) were excluded by quality control. Across 6 comparable years, mean wave height was the same as the same-month mean of 2.6 ft and mean wave period was above the same-month mean of 6.6 seconds.

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

Typical Significant Wave Height

2.1ft
Mean: 2.6 ft
P10–P90: 0.9 — 5.3 ft
Recorded extremes

0.5 — 10.5 ft

Mean Observed Wave Period

6.7secs
P10–P90: 3.8 — 10secs
Recorded extremes

2.1 — 15.4secs

Available for 741 of 744 hourly samples

Observed Wave Direction

SW

Circular concentration: 93%

Mean Water Temperature

17.5°C
P10–P90: 16.9 — 18°C
Recorded extremes

16.8 — 19°C

Compared With Previous Augusts

Historical baseline from 8,917 observations across 6 years.

Wave Height
2.6ft
0ft above mean
Historical mean 2.592ft
Wave Period
6.7s
0.1s above mean
Historical mean 6.6s
Water Temperature
17.5°C
0.3°C above mean
Historical mean 17.2°C

Chart showing grouped wave observations for Chesil. 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 Chesil wave buoy

Chesil is a Channel Coastal Observatory National Network wave station off Dorset's exposed Jurassic Coast. It records waves approaching Chesil Beach and the western side of Portland, providing a nearshore reference for the long shingle barrier and the communities and infrastructure behind it.

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.
Chesil wave buoy daily means Aug 2016Last observation shown
Metric
Mean significant wave height (ft)365432332222211112496321111QC rejected312
Mean maximum wave height (ft)49774355323331222361485322117423
Mean peak period (s)5766675996454895996865989867874
Mean zero-crossing period (s)3544444443333444464544555344553
Mean energy period (s)-------------------------------
Mean wave power, kilowatts per metre-------------------------------
Mean peak wave directionSWconcentration 99%SWconcentration 100%SWconcentration 100%SWconcentration 100%SWconcentration 99%SWconcentration 99%SWconcentration 99%SWconcentration 97%SWconcentration 93%WSWconcentration 96%WSWconcentration 97%SWconcentration 100%SWconcentration 100%SSWconcentration 94%Sconcentration 90%SSEconcentration 99%SSWconcentration 70%SWconcentration 98%SSWconcentration 98%SWconcentration 100%SWconcentration 100%SWconcentration 99%SWconcentration 98%SWconcentration 98%SWconcentration 92%SWconcentration 94%SSWconcentration 93%SWconcentration 100%SWconcentration 100%SWconcentration 99%SWconcentration 99%
Mean directional spread (°)28.918.920.120.129.340.827.036.143.037.024.926.325.457.941.231.754.744.629.415.417.925.844.044.456.653.947.320.226.744.032.6
Mean water temperature(°C)16.916.917.017.217.117.317.417.317.116.917.017.117.217.517.317.417.517.817.717.917.917.917.917.917.817.917.717.818.018.318.1

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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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