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M2 wave buoy observations on Thu, Sep 30, 2021

Hourly readings from the M2 wave buoy for Thu, Sep 30, 2021, including available wave height, period, direction, wind and sea temperature data.

Last observation shown

Oldest observation available

Daily means for

Latest

Period Summary

Programmatically generated summary. Hog Says

24 wave-buoy observations were recorded during the day. Typical wave height was 6.4 ft (10th–90th percentile 4.6–9.1 ft), while mean peak wave period was 6.9 seconds (10th–90th percentile 5.1–8.2 seconds). Typical wind was 22 mph (10th–90th percentile 15–31.2 mph) and mean water temperature was 15.1°C (10th–90th percentile 15–15.1°C). All 144 checked values passed quality control.

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

Line chart showing wave height, wave period and sea temperature for M2. Use the detailed observations table below for the same data in text form.

About M2 wave buoy

M2 (WMO 62091) is part of the Irish Marine Data Buoy Observation Network, managed by the Marine Institute in collaboration with Met Éireann. Moored in the Irish Sea east of Ireland, it provides open-water context for the busy, relatively enclosed waters between the Irish and British coasts.

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

Metrics are rows; hours run left to right. Times use your device time zone.
M2 wave buoy hourly observations Thu, Sep 30, 2021Last observation shown
Metric
Significant wave height (ft)44567889101098777765555566
Maximum wave height (ft)5568111010121615151213999977687910
Peak period (s)455566778788889768768766
Zero-crossing period (s)444455556666665555555555
Peak wave directionSSWSSSSSSSSWSSSSSSSSSSSSSSSS
Mean wave directionSSWSSSSWSSSWSSSSSSSSSSSSSSSSSS
Directional spread (°)23.921.114.121.114.122.515.516.921.116.914.125.318.316.925.312.712.721.125.314.128.119.715.516.9
Wind directionSSWSWSSWSSWSSSWSSWSSWSSWSSWSSWSWSWWSWWSWWSWSWSWSWSWSSWSSWSSWSSW
Wind speed (mph)192827313133333127232116141719151415161721242525
Water temperature(°C)15.015.015.015.015.115.115.115.115.115.115.115.115.015.015.015.115.115.015.015.015.015.015.115.0

Swipe sideways to see more hours.

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 Met Éireann Irish Marine Data Buoy Observation Network.

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

› Wave Buoy List