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Lowestoft wave buoy daily means for Sep 2021

Daily means from the Lowestoft wave buoy for Sep 2021, 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

1,435 wave-buoy observations covered all 30 days. Typical wave height was 2 ft (10th–90th percentile 1–3.3 ft), while mean average of more than one wave period type was 5.4 seconds (10th–90th percentile 3.4–7.4 seconds). Mean water temperature was 17.6°C (10th–90th percentile 17.1–17.9°C). 3 of 5,731 checked values (0.1%) were excluded by quality control. Across 5 comparable years, mean wave height was below the same-month mean of 2.4 ft and mean wave period was above the same-month mean of 5.2 seconds.

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

Typical Significant Wave Height

2ft
Mean: 2.1 ft
P10–P90: 1 — 3.3 ft
Recorded extremes

0.4 — 8.1 ft

Mean Observed Wave Period

5.4secs
P10–P90: 3.4 — 7.4secs
Recorded extremes

1.8 — 16.7secs

Observed Wave Direction

E

Circular concentration: 59%

Mean Water Temperature

17.6°C
P10–P90: 17.1 — 17.9°C
Recorded extremes

16.9 — 18.2°C

Compared With Previous Septembers

Historical baseline from 7,125 observations across 5 years.

Wave Height
2.1ft
0.3ft below mean
Historical mean 2.362ft
Wave Period
5.4s
0.2s above mean
Historical mean 5.2s
Water Temperature
17.6°C
0.2°C above mean
Historical mean 17.4°C

Chart showing grouped wave observations for Lowestoft. 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 Lowestoft wave buoy

Lowestoft is a Channel Coastal Observatory wave station off the Suffolk coast at Britain's most easterly town. Its North Sea observations provide local context for the harbour approaches, developed seafront and low-lying coastline around Lowestoft and northern Suffolk.

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.
Lowestoft wave buoy daily means Sep 2021Last observation shown
Metric
Mean significant wave height (ft)432321111222233222321122224434
Mean maximum wave height (ft)544542112222354333442233337646
Mean peak period (s)776555433454656677565445986567
Mean zero-crossing period (s)444444333343444444443334434444
Mean energy period (s)------------------------------
Mean wave power, kilowatts per metre------------------------------
Mean peak wave directionNEconcentration 100%NEconcentration 100%NEconcentration 98%ENEconcentration 98%ENEconcentration 96%ENEconcentration 94%ESEconcentration 85%ESEconcentration 89%SEconcentration 82%SSEconcentration 93%SSEconcentration 98%Econcentration 49%NEconcentration 98%Econcentration 95%NEconcentration 99%NEconcentration 88%NEconcentration 82%NEconcentration 97%ENEconcentration 92%ENEconcentration 94%Econcentration 82%SEconcentration 68%SEconcentration 90%ESEconcentration 74%Econcentration 58%SEconcentration 51%Sconcentration 99%Sconcentration 98%Variableconcentration 4%ESEconcentration 30%
Mean directional spread (°)29.430.936.938.038.547.550.245.141.435.535.441.037.433.932.739.932.932.436.734.547.540.644.445.644.035.026.327.034.531.6
Mean water temperature(°C)17.117.117.117.117.217.317.517.617.817.918.018.017.917.817.817.717.817.817.917.817.817.717.617.617.617.717.717.617.517.2

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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