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Greenwich wave buoy daily means for Jun 2014

Daily means from the Greenwich wave buoy for Jun 2014, 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

601 wave-buoy observations covered all 30 days. Typical wave height was 1 ft (10th–90th percentile 0.3–2 ft), while mean reported wave period; measurement type unavailable was 6.4 seconds (10th–90th percentile 5–8 seconds). Typical wind was 11.4 mph (10th–90th percentile 5.8–20.8 mph) and mean water temperature was 14.5°C (10th–90th percentile 13.2–15.7°C). 22 of 3,005 checked values (0.7%) were excluded by quality control. Across 3 comparable years, mean wave height was below the same-month mean of 1.9 ft and mean wave period was above the same-month mean of 6.2 seconds.

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

Typical Wave Height

1ft
Mean: 1.2 ft
P10–P90: 0.3 — 2 ft
Recorded extremes

0 — 6.9 ft

Mean Wave Period

6.4secs
P10–P90: 5 — 8secs
Recorded extremes

4 — 26secs

Available for 581 of 601 hourly samples

Mean Water Temperature

14.5°C
P10–P90: 13.2 — 15.7°C
Recorded extremes

12.8 — 17.8°C

Available for 600 of 601 hourly samples

Typical Wind

Variable, 11.4mph
Mean: 12.3 mph
P10–P90: 5.8 — 20.8 mph
Recorded extremes

0 — 35.8 mph

Circular concentration: 13%

Available for 600 of 601 hourly samples

Compared With Previous Junes

Historical baseline from 2,123 observations across 3 years.

Wave Height
1.2ft
0.7ft below mean
Historical mean 1.9ft
Wave Period
6.4s
0.2s above mean
Historical mean 6.2s
Water Temperature
14.5°C
1.8°C above mean
Historical mean 12.7°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 Jun 2014Last observation shown
Metric
Mean wave height (ft)1112QC rejected1122221011121110000111211
Mean observed period(s)7Reported7Reported7Reported7Reported7Reported5Reported6Reported9Reported8Reported8Reported7Reported7Reported6Reported7Reported6Reported5Reported5Reported5Reported5Reported5Reported6Reported10ReportedQC rejected5Reported5Reported5Reported5Reported6Reported6Reported5Reported
Mean wave power(kW/m)------------------------------
Mean wind directionWconcentration 98%SWconcentration 94%SWconcentration 93%WSWconcentration 41%WSWconcentration 82%Econcentration 95%Variableconcentration 22%Variableconcentration 27%Variableconcentration 5%SWconcentration 83%Wconcentration 88%NWconcentration 48%WNWconcentration 34%ENEconcentration 72%NNEconcentration 88%NNEconcentration 85%NNEconcentration 87%Nconcentration 51%Variableconcentration 27%NNEconcentration 78%NNEconcentration 40%NEconcentration 80%NEconcentration 88%NWconcentration 46%ENEconcentration 93%Econcentration 84%SWconcentration 88%SWconcentration 91%NWconcentration 79%SEconcentration 58%
Mean wind speed (mph)10131318201912812101178913131711101061510818171113138
Mean water temperature(°C)13.513.413.113.113.213.513.915.014.814.614.715.314.814.314.114.014.114.214.514.815.315.515.816.115.114.714.815.115.015.4

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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