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M2 wave buoy observations on Tue, Dec 20, 2011

Hourly readings from the M2 wave buoy for Tue, Dec 20, 2011, 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 3.8 ft (10th–90th percentile 2.6–5.1 ft), while mean peak wave period was 4.5 seconds (10th–90th percentile 3.6–5.3 seconds). Mean water temperature was 11.4°C (10th–90th percentile 11.1–11.5°C). All 120 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 Tue, Dec 20, 2011Last observation shown
Metric
Significant wave height (ft)555565555444443333333344
Maximum wave height (ft)86671171067565555453333555
Peak period (s)555556555544444444434455
Zero-crossing period (s)444455544444444444434445
Peak wave directionWNWWNWWWNWNWNWNWNNWNWNWWNWWNWWWWWWWSWWSWSWSSSWSSWS
Mean wave directionWNWWNWWWNWWNWNWNWNWNWNWNWWNWWNWWWWWWSWSWSSWSSWSSWSSWS
Directional spread (°)22.529.225.320.419.022.517.924.326.726.729.930.917.624.625.331.617.626.434.131.624.625.020.014.4
Wind directionWNWWNWWNWWNWWNWWNWNWWNWWNWWNWWNWWNWWNWWWWWSWSSSWSSWSSWSSWSWWSW
Wind speed (mph)------------------------
Water temperature(°C)11.511.511.511.511.511.511.511.511.511.511.511.511.311.011.011.011.511.511.511.511.511.511.311.4

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.

Observation data source

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

› Wave Buoy List