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Lowestoft wave buoy daily means for May 2021

Daily means from the Lowestoft wave buoy for May 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

1,488 wave-buoy observations covered all 31 days. Typical wave height was 1.9 ft (10th–90th percentile 1.2–4.5 ft), while mean average of more than one wave period type was 5.7 seconds (10th–90th percentile 3.6–8.3 seconds). Mean water temperature was 10.1°C (10th–90th percentile 8.8–11.6°C). 10 of 5,925 checked values (0.2%) were excluded by quality control. Across 5 comparable years, mean wave height was above the same-month mean of 2.2 ft and mean wave period was above the same-month mean of 5.3 seconds.

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

Typical Significant Wave Height

1.9ft
Mean: 2.4 ft
P10–P90: 1.2 — 4.5 ft
Recorded extremes

0.7 — 8.6 ft

Mean Observed Wave Period

5.7secs
P10–P90: 3.6 — 8.3secs
Recorded extremes

1.9 — 11.8secs

Available for 743 of 744 hourly samples

Observed Wave Direction

ESE

Circular concentration: 55%

Mean Water Temperature

10.1°C
P10–P90: 8.8 — 11.6°C
Recorded extremes

8.6 — 12.9°C

Compared With Previous Mays

Historical baseline from 7,280 observations across 5 years.

Wave Height
2.4ft
0.2ft above mean
Historical mean 2.165ft
Wave Period
5.7s
0.4s above mean
Historical mean 5.3s
Water Temperature
10.1°C
1.4°C below mean
Historical mean 11.5°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 May 2021Last observation shown
Metric
Mean significant wave height (ft)2235322422122222211363342232122
Mean maximum wave height (ft)33675436342333332224105562343233
Mean peak period (s)6657987544444555667677665577644
Mean zero-crossing period (s)4444554433333444444455443344434
Mean energy period (s)-------------------------------
Mean wave power, kilowatts per metre-------------------------------
Mean peak wave directionNEconcentration 98%NEconcentration 100%SSEconcentration 66%SSEconcentration 61%NEconcentration 99%NEconcentration 99%NEconcentration 84%SSEconcentration 99%SSEconcentration 99%SSEconcentration 91%SEconcentration 92%SSEconcentration 96%ENEconcentration 83%ENEconcentration 97%Econcentration 69%SSEconcentration 76%SEconcentration 60%SEconcentration 60%ESEconcentration 50%SEconcentration 50%Sconcentration 100%ESEconcentration 58%SEconcentration 57%SSEconcentration 99%SSEconcentration 98%ENEconcentration 52%NEconcentration 99%NEconcentration 99%ENEconcentration 96%ENEconcentration 92%ENEconcentration 98%
Mean directional spread (°)38.833.228.234.834.436.039.931.133.231.841.032.843.839.341.645.547.043.445.028.617.341.936.226.536.843.234.438.344.738.939.7
Mean water temperature(°C)8.99.09.08.98.98.88.88.89.09.29.59.79.910.110.110.210.310.410.410.310.610.610.711.011.111.111.211.411.711.912.1

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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