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Greenwich wave buoy daily means for Feb 2012

Daily means from the Greenwich wave buoy for Feb 2012, 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

38 wave-buoy observations covered 2 of 29 days (7%). Mean reported wave period; measurement type unavailable was 26 seconds; wave-height data were unavailable. Typical wind was 22 mph (10th–90th percentile 19.6–25.7 mph) and mean water temperature was 3.8°C. 4 of 114 checked values (3.5%) were excluded by quality control.

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

Typical Wave Height

-ft
Mean: - ft
P10–P90: - — - ft

Available for 0 of 38 hourly samples

Mean Wave Period

26secs
P10–P90: 26 — 26secs
Recorded extremes

26 — 26secs

Available for 34 of 38 hourly samples

Mean Water Temperature

3.8°C
P10–P90: 3.8 — 3.8°C
Recorded extremes

3.8 — 3.8°C

Available for 1 of 38 hourly samples

Typical Wind

NE, 22mph
Mean: 22.3 mph
P10–P90: 19.6 — 25.7 mph
Recorded extremes

18.4 — 28.9 mph

Circular concentration: 92%

Available for 37 of 38 hourly samples

Compared With Previous Februarys

Historical baseline from 672 observations across 1 year.

Wave Height
–
Not enough comparable data
Historical mean 3.3ft
Wave Period
26s
18.8s above mean
Historical mean 7.2s
Water Temperature
3.8°C
4.8°C below mean
Historical mean 8.6°C

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 Feb 2012Last observation shown
Metric
Mean wave height (ft)-----------------------------
Mean observed period(s)26Reported26Reported---------------------------
Mean wave power(kW/m)-----------------------------
Mean wind directionNEconcentration 96%NEconcentration 86%---------------------------
Mean wind speed (mph)2322---------------------------
Mean water temperature(°C)-3.8---------------------------

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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