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Lowestoft wave buoy daily means for Apr 2020

Daily means from the Lowestoft wave buoy for Apr 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

1,429 wave-buoy observations covered all 30 days. Typical wave height was 2 ft (10th–90th percentile 0.8–5.4 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 8.7°C (10th–90th percentile 7.2–10.1°C). 8 of 5,650 checked values (0.1%) were excluded by quality control. Across 4 comparable years, mean wave height was above the same-month mean of 2.4 ft and mean wave period was the same as the same-month mean of 5.4 seconds.

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

Typical Significant Wave Height

2ft
Mean: 2.6 ft
P10–P90: 0.8 — 5.4 ft
Recorded extremes

0.4 — 8.4 ft

Available for 715 of 716 hourly samples

Mean Observed Wave Period

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

1.7 — 14.3secs

Available for 714 of 716 hourly samples

Observed Wave Direction

ENE

Circular concentration: 76%

Mean Water Temperature

8.7°C
P10–P90: 7.2 — 10.1°C
Recorded extremes

7 — 10.7°C

Available for 715 of 716 hourly samples

Compared With Previous Aprils

Historical baseline from 4,680 observations across 4 years.

Wave Height
2.6ft
0.2ft above mean
Historical mean 2.428ft
Wave Period
5.4s
In line with the historical mean
Historical mean 5.4s
Water Temperature
8.7°C
0.2°C above mean
Historical mean 8.5°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 Apr 2020Last observation shown
Metric
Mean significant wave height (ft)112222111211QC rejected42253477531221334
Mean maximum wave height (ft)22333211132195227571011842432446
Mean peak period (s)669844444555776455677764654445
Mean zero-crossing period (s)434333333433554344455543443344
Mean energy period (s)------------------------------
Mean wave power, kilowatts per metre------------------------------
Mean peak wave directionNEconcentration 97%NEconcentration 81%NEconcentration 94%ESEconcentration 47%ESEconcentration 94%SEconcentration 96%SEconcentration 93%Econcentration 94%Econcentration 87%ENEconcentration 97%ENEconcentration 89%Econcentration 67%NEconcentration 99%NEconcentration 99%ENEconcentration 72%Econcentration 95%ENEconcentration 100%ENEconcentration 99%ENEconcentration 100%ENEconcentration 100%ENEconcentration 100%NEconcentration 99%ENEconcentration 98%NEconcentration 91%NEconcentration 98%ESEconcentration 52%NEconcentration 59%ENEconcentration 96%ESEconcentration 79%Sconcentration 99%
Mean directional spread (°)39.745.737.437.836.238.345.448.050.135.646.545.827.631.239.739.027.234.025.424.223.325.934.540.034.836.840.535.637.321.7
Mean water temperature(°C)7.07.17.17.27.47.57.77.98.18.38.58.88.78.68.78.88.98.99.09.09.19.39.59.79.910.010.210.210.210.3

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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