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Ch. Lightship wave buoy daily means for Sep 2017

Daily means from the Ch. Lightship 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

717 wave-buoy observations covered all 30 days. Typical wave height was 3.9 ft (10th–90th percentile 1.6–7.9 ft), while mean reported wave period; measurement type unavailable was 7.5 seconds (10th–90th percentile 6–9 seconds). Typical wind was 19.7 mph (10th–90th percentile 11–32.2 mph) and mean water temperature was 16.2°C (10th–90th percentile 16–16.6°C). All 3,585 checked values passed quality control. Across 7 comparable years, mean wave height was above the same-month mean of 3.2 ft and mean wave period was the same as the same-month mean of 7.5 seconds.

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

Typical Wave Height

3.9ft
Mean: 4.4 ft
P10–P90: 1.6 — 7.9 ft
Recorded extremes

1 — 12.8 ft

Mean Wave Period

7.5secs
P10–P90: 6 — 9secs
Recorded extremes

5 — 15secs

Mean Water Temperature

16.2°C
P10–P90: 16 — 16.6°C
Recorded extremes

15.9 — 17.3°C

Typical Wind

W, 19.7mph
Mean: 20.6 mph
P10–P90: 11 — 32.2 mph
Recorded extremes

3.4 — 48.3 mph

Circular concentration: 50%

Compared With Previous Septembers

Historical baseline from 4,948 observations across 7 years.

Wave Height
4.4ft
1.2ft above mean
Historical mean 3.2ft
Wave Period
7.5s
In line with the historical mean
Historical mean 7.5s
Water Temperature
16.2°C
0.2°C below mean
Historical mean 16.4°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 Sep 2017Last observation shown
Metric
Mean wave height (ft)2154653556106974212224347534467
Mean observed period(s)7Reported7Reported7Reported8Reported9Reported7Reported7Reported6Reported7Reported7Reported8Reported7Reported8Reported7Reported7Reported7Reported7Reported8Reported7Reported6Reported6Reported7Reported8Reported10Reported10Reported8Reported8Reported8Reported9Reported9Reported
Mean wave power(kW/m)------------------------------
Mean wind directionNconcentration 78%WNWconcentration 53%Sconcentration 99%SWconcentration 93%WSWconcentration 82%Wconcentration 99%WSWconcentration 94%WSWconcentration 95%WNWconcentration 95%Wconcentration 88%Wconcentration 99%WSWconcentration 86%Wconcentration 99%WNWconcentration 98%NWconcentration 95%Nconcentration 81%NEconcentration 66%NWconcentration 92%WNWconcentration 88%SSWconcentration 95%SWconcentration 67%SWconcentration 90%SSEconcentration 81%SSEconcentration 67%NWconcentration 86%Nconcentration 59%SSEconcentration 95%SWconcentration 72%WSWconcentration 86%SWconcentration 90%
Mean wind speed (mph)13122515252321292629383035301911121518202317171213920182023
Mean water temperature(°C)16.716.816.516.616.616.516.516.416.316.316.216.216.216.016.116.116.016.116.116.116.116.016.116.116.116.216.116.216.116.0

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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