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Ch. Lightship wave buoy daily means for Sep 2013

Daily means from the Ch. Lightship wave buoy for Sep 2013, 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

698 wave-buoy observations covered all 30 days. Typical wave height was 2.6 ft (10th–90th percentile 1.3–5.2 ft), while mean reported wave period; measurement type unavailable was 7.1 seconds (10th–90th percentile 5.3–9 seconds). Typical wind was 15 mph (10th–90th percentile 6.9–28.8 mph) and mean water temperature was 16°C (10th–90th percentile 15.7–16.3°C). 7 of 3,490 checked values (0.2%) were excluded by quality control. Across 3 comparable years, mean wave height was below the same-month mean of 3.4 ft and mean wave period was below the same-month mean of 8 seconds.

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

Typical Wave Height

2.6ft
Mean: 3 ft
P10–P90: 1.3 — 5.2 ft
Recorded extremes

0 — 8.9 ft

Available for 695 of 698 hourly samples

Mean Wave Period

7.1secs
P10–P90: 5.3 — 9secs
Recorded extremes

5 — 13secs

Available for 694 of 698 hourly samples

Mean Water Temperature

16°C
P10–P90: 15.7 — 16.3°C
Recorded extremes

15.5 — 17.2°C

Typical Wind

Variable, 15mph
Mean: 16.2 mph
P10–P90: 6.9 — 28.8 mph
Recorded extremes

0 — 42.5 mph

Circular concentration: 24%

Compared With Previous Septembers

Historical baseline from 2,146 observations across 3 years.

Wave Height
3ft
0.4ft below mean
Historical mean 3.4ft
Wave Period
7.1s
0.9s below mean
Historical mean 8s
Water Temperature
16°C
0.2°C below mean
Historical mean 16.2°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 Sep 2013Last observation shown
Metric
Mean wave height (ft)211112324421234666432234345542
Mean observed period(s)7Reported7Reported8Reported9Reported9Reported6Reported6Reported6Reported6Reported6Reported5Reported6Reported5Reported6Reported7Reported7Reported7Reported7Reported6Reported7Reported8Reported8Reported10Reported10Reported9Reported9Reported7Reported7Reported7Reported7Reported
Mean wave power(kW/m)------------------------------
Mean wind directionNNWconcentration 61%WNWconcentration 91%NEconcentration 80%ENEconcentration 94%NWconcentration 77%Wconcentration 78%WSWconcentration 87%WSWconcentration 93%WNWconcentration 45%NNWconcentration 87%NNWconcentration 83%WNWconcentration 86%Wconcentration 90%Nconcentration 98%Wconcentration 75%WNWconcentration 98%Wconcentration 90%NWconcentration 91%Wconcentration 85%WNWconcentration 92%SWconcentration 93%Sconcentration 47%Econcentration 98%Econcentration 87%Econcentration 95%Econcentration 93%ENEconcentration 98%ENEconcentration 86%ENEconcentration 98%ESEconcentration 97%
Mean wind speed (mph)13126911141517192218122118223029242111116151071427231710
Mean water temperature(°C)16.416.316.616.216.116.015.915.815.915.915.916.116.015.915.915.715.715.715.715.715.715.915.816.015.915.915.915.915.916.1

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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