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Greenwich wave buoy daily means for Sep 2010

Daily means from the Greenwich wave buoy for Sep 2010, 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

647 wave-buoy observations covered all 30 days. Typical wave height was 1.6 ft (10th–90th percentile 1–3.4 ft), while mean reported wave period; measurement type unavailable was 6 seconds (10th–90th percentile 5–7 seconds). Typical wind was 18.4 mph (10th–90th percentile 10.3–28.9 mph). 1 of 2,579 checked values (0%) were excluded by quality control.

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

Typical Wave Height

1.6ft
Mean: 1.9 ft
P10–P90: 1 — 3.4 ft
Recorded extremes

0.7 — 9.2 ft

Mean Wave Period

6secs
P10–P90: 5 — 7secs
Recorded extremes

4 — 11secs

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 647 hourly samples

Typical Wind

Variable, 18.4mph
Mean: 19 mph
P10–P90: 10.3 — 28.9 mph
Recorded extremes

0 — 40.3 mph

Circular concentration: 27%

Available for 646 of 647 hourly samples

Chart showing grouped wave observations for Greenwich. 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 Greenwich wave buoy

Greenwich Lightship (WMO 62305) is a UK Met Office station in the southern North Sea on the Greenwich meridian. It monitors marine conditions between the Dover Strait and the Thames approaches. The station feed can include wind, wave height, pressure, visibility, and air and sea temperature.

Metrics are rows; days run left to right.
Greenwich wave buoy daily means Sep 2010Last observation shown
Metric
Mean wave height (ft)111222211222265311221122332121
Mean observed period(s)5Reported5Reported7Reported8Reported6Reported5Reported6Reported6Reported6Reported5Reported6Reported6Reported6Reported7Reported6Reported6Reported5Reported6Reported5Reported6Reported6Reported7Reported7Reported5Reported6Reported5Reported6Reported7Reported6Reported6Reported
Mean wave power(kW/m)------------------------------
Mean wind directionENEconcentration 97%ENEconcentration 97%ENEconcentration 98%Econcentration 97%Econcentration 98%ESEconcentration 77%SSWconcentration 70%NWconcentration 65%Wconcentration 96%SWconcentration 92%SWconcentration 97%WNWconcentration 92%WNWconcentration 76%WSWconcentration 99%Wconcentration 98%WNWconcentration 98%NWconcentration 90%NWconcentration 82%WSWconcentration 95%WSWconcentration 97%SEconcentration 46%Sconcentration 73%SSWconcentration 87%NWconcentration 82%NNWconcentration 96%NNWconcentration 97%NNWconcentration 78%WNWconcentration 91%SSWconcentration 88%Wconcentration 81%
Mean wind speed (mph)1922211922271618191719171635292217132020813162426311391714
Mean water temperature(°C)------------------------------

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.

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