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Greenwich wave buoy daily means for Nov 2019

Daily means from the Greenwich wave buoy for Nov 2019, 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

718 wave-buoy observations covered all 30 days. Typical wave height was 3 ft (10th–90th percentile 1.3–6.2 ft), while mean reported wave period; measurement type unavailable was 6.3 seconds (10th–90th percentile 5–8 seconds). Typical wind was 23 mph (10th–90th percentile 10.3–34.4 mph) and mean water temperature was 13.8°C (10th–90th percentile 13–15°C). 1 of 3,590 checked values (0%) were excluded by quality control. Across 9 comparable years, mean wave height was above the same-month mean of 3.5 ft and mean wave period was the same as the same-month mean of 6.3 seconds.

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

Typical Wave Height

3ft
Mean: 3.6 ft
P10–P90: 1.3 — 6.2 ft
Recorded extremes

0.3 — 17.7 ft

Available for 717 of 718 hourly samples

Mean Wave Period

6.3secs
P10–P90: 5 — 8secs
Recorded extremes

4 — 9secs

Mean Water Temperature

13.8°C
P10–P90: 13 — 15°C
Recorded extremes

12.5 — 15.4°C

Typical Wind

Variable, 23mph
Mean: 23.1 mph
P10–P90: 10.3 — 34.4 mph
Recorded extremes

0 — 58.8 mph

Circular concentration: 24%

Compared With Previous Novembers

Historical baseline from 6,154 observations across 9 years.

Wave Height
3.6ft
0.1ft above mean
Historical mean 3.5ft
Wave Period
6.3s
In line with the historical mean
Historical mean 6.3s
Water Temperature
13.8°C
0.4°C below mean
Historical mean 14.2°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 Nov 2019Last observation shown
Metric
Mean wave height (ft)311554242335QC rejected333212133432357522
Mean observed period(s)6Reported8Reported7Reported7Reported8Reported7Reported6Reported7Reported6Reported7Reported6Reported7Reported6Reported6Reported6Reported5Reported6Reported5Reported6Reported6Reported6Reported6Reported5Reported6Reported6Reported6Reported7Reported7Reported7Reported6Reported
Mean wave power(kW/m)------------------------------
Mean wind directionSSWconcentration 92%SWconcentration 97%WSWconcentration 89%SWconcentration 93%NWconcentration 32%Variableconcentration 11%WSWconcentration 78%Nconcentration 64%SWconcentration 58%Econcentration 64%Wconcentration 81%WNWconcentration 97%Wconcentration 59%Sconcentration 48%NNEconcentration 85%SEconcentration 72%ESEconcentration 38%Nconcentration 98%Variableconcentration 29%SEconcentration 92%SEconcentration 88%SSEconcentration 82%ESEconcentration 91%SSWconcentration 96%Sconcentration 96%Sconcentration 96%SWconcentration 85%WNWconcentration 92%NNEconcentration 92%Econcentration 98%
Mean wind speed (mph)264221271815261320183134241327151222132623312321263133231626
Mean water temperature(°C)15.315.115.014.914.914.814.514.414.314.214.113.913.913.513.413.313.413.413.213.113.013.113.213.213.113.213.113.112.812.6

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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