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Ch. Lightship wave buoy daily means for Dec 2015

Daily means from the Ch. Lightship wave buoy for Dec 2015, 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

742 wave-buoy observations covered all 31 days. Typical wave height was 8.9 ft (10th–90th percentile 5.9–13.1 ft), while mean reported wave period; measurement type unavailable was 8.6 seconds (10th–90th percentile 7–10 seconds). Typical wind was 27.7 mph (10th–90th percentile 19.7–36.9 mph) and mean water temperature was 12.9°C (10th–90th percentile 12.6–13.3°C). 4 of 3,710 checked values (0.1%) were excluded by quality control. Across 5 comparable years, mean wave height was above the same-month mean of 6.4 ft and mean wave period was above the same-month mean of 7.7 seconds.

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

Typical Wave Height

8.9ft
Mean: 9.3 ft
P10–P90: 5.9 — 13.1 ft
Recorded extremes

3.9 — 20.3 ft

Available for 738 of 742 hourly samples

Mean Wave Period

8.6secs
P10–P90: 7 — 10secs
Recorded extremes

6 — 12secs

Mean Water Temperature

12.9°C
P10–P90: 12.6 — 13.3°C
Recorded extremes

12.2 — 13.5°C

Typical Wind

SSW, 27.7mph
Mean: 27.7 mph
P10–P90: 19.7 — 36.9 mph
Recorded extremes

2.2 — 51.9 mph

Circular concentration: 81%

Compared With Previous Decembers

Historical baseline from 3,532 observations across 5 years.

Wave Height
9.3ft
2.9ft above mean
Historical mean 6.4ft
Wave Period
8.6s
0.9s above mean
Historical mean 7.7s
Water Temperature
12.9°C
1°C above mean
Historical mean 11.9°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 Dec 2015Last observation shown
Metric
Mean wave height (ft)7798121391098775681087912101011129119791616
Mean observed period(s)8Reported8Reported8Reported8Reported9Reported10Reported9Reported9Reported9Reported8Reported8Reported8Reported9Reported7Reported9Reported10Reported9Reported10Reported8Reported10Reported8Reported8Reported9Reported9Reported9Reported9Reported9Reported7Reported8Reported10Reported10Reported
Mean wave power(kW/m)-------------------------------
Mean wind directionWSWconcentration 94%SWconcentration 98%SSWconcentration 91%Wconcentration 85%SWconcentration 99%SWconcentration 95%Sconcentration 95%WSWconcentration 80%SWconcentration 93%SWconcentration 96%Wconcentration 81%SWconcentration 84%Sconcentration 80%SSEconcentration 98%Sconcentration 91%SWconcentration 91%SSWconcentration 89%SSWconcentration 95%Sconcentration 99%SWconcentration 98%SWconcentration 91%SWconcentration 94%SWconcentration 87%SWconcentration 84%SSWconcentration 97%SSWconcentration 98%SSWconcentration 85%SSEconcentration 96%SSWconcentration 92%SSWconcentration 88%WSWconcentration 88%
Mean wind speed (mph)28263130342626282529222518262223222028283031303230322732283635
Mean water temperature(°C)13.413.413.413.213.113.213.213.112.913.012.912.912.912.812.912.912.912.912.912.912.712.812.712.612.612.712.712.612.612.512.3

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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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