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Ch. Lightship wave buoy daily means for Apr 2017

Daily means from the Ch. Lightship wave buoy for Apr 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

718 wave-buoy observations covered all 30 days. Typical wave height was 1.6 ft (10th–90th percentile 0.7–4.9 ft), while mean reported wave period; measurement type unavailable was 7.1 seconds (10th–90th percentile 5–10 seconds). Typical wind was 15 mph (10th–90th percentile 5.8–23 mph) and mean water temperature was 11.1°C (10th–90th percentile 10.6–11.6°C). All 3,590 checked values passed quality control. Across 7 comparable years, mean wave height was below the same-month mean of 3.8 ft and mean wave period was below the same-month mean of 7.7 seconds.

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

Typical Wave Height

1.6ft
Mean: 2.2 ft
P10–P90: 0.7 — 4.9 ft
Recorded extremes

0.3 — 8.9 ft

Mean Wave Period

7.1secs
P10–P90: 5 — 10secs
Recorded extremes

4 — 14secs

Mean Water Temperature

11.1°C
P10–P90: 10.6 — 11.6°C
Recorded extremes

10.4 — 12.7°C

Typical Wind

NNW, 15mph
Mean: 14.8 mph
P10–P90: 5.8 — 23 mph
Recorded extremes

2.2 — 40.3 mph

Circular concentration: 38%

Compared With Previous Aprils

Historical baseline from 4,990 observations across 7 years.

Wave Height
2.2ft
1.6ft below mean
Historical mean 3.8ft
Wave Period
7.1s
0.6s below mean
Historical mean 7.7s
Water Temperature
11.1°C
1°C above mean
Historical mean 10.1°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 2017Last observation shown
Metric
Mean wave height (ft)753752222222112212111111321114
Mean observed period(s)9Reported9Reported10Reported11Reported10Reported9Reported10Reported11Reported9Reported8Reported7Reported5Reported6Reported6Reported5Reported5Reported5Reported5Reported5Reported5Reported8Reported8Reported7Reported7Reported5Reported5Reported6Reported5Reported6Reported6Reported
Mean wave power(kW/m)------------------------------
Mean wind directionNconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Nconcentration 100%Variableconcentration 20%SEconcentration 60%SSWconcentration 78%WNWconcentration 81%Variableconcentration 19%Wconcentration 98%WNWconcentration 69%WNWconcentration 84%WNWconcentration 95%WNWconcentration 94%WNWconcentration 89%NEconcentration 87%ENEconcentration 88%Variableconcentration 9%WSWconcentration 89%Nconcentration 62%SSWconcentration 34%WNWconcentration 86%Nconcentration 97%Nconcentration 88%NWconcentration 57%WNWconcentration 84%SEconcentration 63%SEconcentration 77%
Mean wind speed (mph)17121116161181519161321121520201517167710613242113151722
Mean water temperature(°C)10.610.710.610.810.810.810.910.910.910.810.910.911.011.011.011.011.211.111.111.311.711.811.811.611.111.011.011.211.311.3

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.

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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