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Seaford wave buoy daily means for Nov 2020

Daily means from the Seaford wave buoy for Nov 2020, 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

1,436 wave-buoy observations covered all 30 days. Typical wave height was 3 ft (10th–90th percentile 0.8–7.4 ft), while mean average of more than one wave period type was 6.5 seconds (10th–90th percentile 3.8–11.5 seconds). Typical wind was 0 mph and mean water temperature was 12.6°C (10th–90th percentile 11.8–13.2°C). 15 of 6,425 checked values (0.2%) were excluded by quality control. Across 7 comparable years, mean wave height was above the same-month mean of 3.4 ft and mean wave period was below the same-month mean of 6.6 seconds.

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

Typical Significant Wave Height

3ft
Mean: 3.6 ft
P10–P90: 0.8 — 7.4 ft
Recorded extremes

0.4 — 11.2 ft

Mean Observed Wave Period

6.5secs
P10–P90: 3.8 — 11.5secs
Recorded extremes

2.1 — 18.2secs

Available for 714 of 719 hourly samples

Observed Wave Direction

SSW

Circular concentration: 85%

Mean Water Temperature

12.6°C
P10–P90: 11.8 — 13.2°C
Recorded extremes

9.4 — 13.8°C

Available for 716 of 719 hourly samples

Compared With Previous Novembers

Historical baseline from 4,757 observations across 7 years.

Wave Height
3.6ft
0.2ft above mean
Historical mean 3.412ft
Wave Period
6.5s
0.1s below mean
Historical mean 6.6s
Water Temperature
12.6°C
0.1°C above mean
Historical mean 12.5°C

Chart showing grouped wave observations for Seaford. 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 Seaford wave buoy

Seaford is a National Network Datawell Directional WaveRider in about 11 metres of water off East Sussex. First deployed on 22 January 2008, it records waves reaching Seaford Bay between Newhaven and Beachy Head and supports assessment of the town's exposed shingle frontage.

Its current data source reports wave height, wave period, wave direction, directional spread, wave power and sea temperature.

Metrics are rows; days run left to right.
Seaford wave buoy daily means Nov 2020Last observation shown
Metric
Mean significant wave height (ft)796212211246469655535324411112
Mean maximum wave height (ft)111393142222697913988848536611214
Mean peak period (s)6771011544645666766576671055128596
Mean zero-crossing period (s)555654333344445544544444454343
Mean energy period (s)------------------------------
Mean reported period (s)000000002345455544544444453343
Mean wave power, kilowatts per metre------------------------------
Mean peak wave directionSWconcentration 100%SWconcentration 99%SWconcentration 99%SWconcentration 96%SSWconcentration 86%SEconcentration 99%SSEconcentration 98%SSEconcentration 96%Sconcentration 88%SSWconcentration 99%SSWconcentration 98%SWconcentration 97%SWconcentration 99%SSWconcentration 99%SSWconcentration 98%SWconcentration 100%SWconcentration 100%SSWconcentration 97%SWconcentration 100%SWconcentration 99%SWconcentration 100%SWconcentration 99%SWconcentration 100%SSWconcentration 97%SSWconcentration 99%SSWconcentration 87%SSEconcentration 80%SSEconcentration 94%SSEconcentration 62%WSWconcentration 90%
Mean directional spread (°)19.516.817.930.543.416.726.530.638.325.922.819.122.921.618.317.819.521.617.220.717.321.030.923.324.150.540.830.947.429.0
Mean reported wave directionSWconcentration 100%SWconcentration 99%SWconcentration 99%SWconcentration 97%SSWconcentration 83%SEconcentration 99%SSEconcentration 97%SSEconcentration 96%Sconcentration 83%SSWconcentration 98%SSWconcentration 98%SWconcentration 98%SWconcentration 98%SSWconcentration 99%SSWconcentration 98%SWconcentration 100%SWconcentration 100%SSWconcentration 96%SWconcentration 100%SWconcentration 99%SWconcentration 100%SWconcentration 99%SWconcentration 100%SSWconcentration 96%SSWconcentration 99%SSWconcentration 82%SSEconcentration 80%SSEconcentration 87%Sconcentration 70%WSWconcentration 85%
Mean water temperature(°C)13.613.713.313.012.812.912.812.913.013.113.112.812.612.712.712.612.612.612.212.212.011.912.112.111.912.012.011.911.811.8

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.

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 Regional Coastal Monitoring Programme.

Learn how SurfHog combines, checks and summarizes observations in the data and methodology notes.

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