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Ch. Lightship wave buoy daily means for Apr 2018

Daily means from the Ch. Lightship wave buoy for Apr 2018, 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

715 wave-buoy observations covered all 30 days. Typical wave height was 4.3 ft (10th–90th percentile 2.3–8.2 ft), while mean reported wave period; measurement type unavailable was 8.7 seconds (10th–90th percentile 6–11 seconds). Typical wind was 17.2 mph (10th–90th percentile 8.5–30 mph) and mean water temperature was 9.8°C (10th–90th percentile 9.3–10.3°C). All 3,575 checked values passed quality control. Across 8 comparable years, mean wave height was above the same-month mean of 3.6 ft and mean wave period was above the same-month mean of 7.6 seconds.

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

Typical Wave Height

4.3ft
Mean: 5 ft
P10–P90: 2.3 — 8.2 ft
Recorded extremes

1.6 — 17.7 ft

Mean Wave Period

8.7secs
P10–P90: 6 — 11secs
Recorded extremes

5 — 15secs

Mean Water Temperature

9.8°C
P10–P90: 9.3 — 10.3°C
Recorded extremes

9.1 — 11.2°C

Typical Wind

Variable, 17.2mph
Mean: 18.3 mph
P10–P90: 8.5 — 30 mph
Recorded extremes

3.4 — 40.3 mph

Circular concentration: 6%

Compared With Previous Aprils

Historical baseline from 5,708 observations across 8 years.

Wave Height
5ft
1.4ft above mean
Historical mean 3.6ft
Wave Period
8.7s
1.1s above mean
Historical mean 7.6s
Water Temperature
9.8°C
0.4°C below mean
Historical mean 10.2°C

Chart showing grouped wave observations for Ch. Lightship. 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 Ch. Lightship wave buoy

Channel Lightship (WMO 62103) is a UK Met Office station in the central English Channel. Its offshore position provides marine observations away from the immediate influence of the coast and is useful for tracking conditions along this major shipping route. The feed can include wind, pressure, air and sea temperature, visibility and wave observations when available.

Metrics are rows; days run left to right.
Ch. Lightship wave buoy daily means Apr 2018Last observation shown
Metric
Mean wave height (ft)QC rejected55QC rejected6674354334691111643223455435
Mean observed period(s)7Reported7Reported8Reported8Reported9Reported8Reported10Reported10Reported10Reported11Reported10Reported8Reported12Reported10Reported9Reported11Reported10Reported12Reported10Reported10Reported10Reported9Reported8Reported7Reported6Reported7Reported8Reported8Reported6Reported6Reported
Mean wave power(kW/m)------------------------------
Mean wind directionVariableconcentration 26%Sconcentration 99%Sconcentration 97%SSWconcentration 66%Variableconcentration 9%SEconcentration 91%WNWconcentration 44%Nconcentration 89%ENEconcentration 37%NNEconcentration 44%NEconcentration 93%NEconcentration 94%Variableconcentration 27%Econcentration 78%Sconcentration 87%SSWconcentration 90%Sconcentration 95%SEconcentration 84%WNWconcentration 58%Nconcentration 84%ENEconcentration 77%SWconcentration 87%Wconcentration 95%SWconcentration 96%Wconcentration 95%WSWconcentration 98%SEconcentration 56%Nconcentration 87%NNEconcentration 96%NNWconcentration 87%
Mean wind speed (mph)2025223220231610151216177151919271991015161723242119112426
Mean water temperature(°C)9.29.39.49.49.49.49.59.69.69.69.79.69.79.69.79.89.910.010.210.310.310.210.310.210.310.310.310.410.310.2

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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.

Which wave period is shown?

The table shows the best period measurement supplied for each observation. It is not necessarily the energy period used to calculate wave power.

Tp
Peak period: the period at the strongest spectral peak.
Tavg
The provider's average wave period.
Tm02
A mean period calculated from the wave spectrum.
Tz
Mean zero-crossing period.
Reported
A legacy value whose period type was not recorded.
Mixed
A daily or monthly mean containing more than one period type.

Wave power needs a genuine energy period (Te). SurfHog does not substitute Tp, Tavg, Tm02 or Tz when Te is missing.

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 UK Met Office.

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