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M2 wave buoy daily means for Oct 2017

Daily means from the M2 wave buoy for Oct 2017, 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

745 wave-buoy observations covered all 31 days. Typical wave height was 4.6 ft (10th–90th percentile 1.7–7.3 ft), while mean peak wave period was 5.7 seconds (10th–90th percentile 4–7.7 seconds). Typical wind was 20 mph (10th–90th percentile 3.2–26.7 mph) and mean water temperature was 14.2°C (10th–90th percentile 13.8–14.5°C). All 2,254 checked values passed quality control. Across 7 comparable years, mean wave height was above the same-month mean of 4.1 ft and mean wave period was above the same-month mean of 5.5 seconds.

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

Typical Significant Wave Height

4.6ft
Mean: 4.9 ft
P10–P90: 1.7 — 7.3 ft
Recorded extremes

0.8 — 21.8 ft

Available for 386 of 745 hourly samples

Mean Observed Wave Period

5.7secs
P10–P90: 4 — 7.7secs
Recorded extremes

2.2 — 11.7secs

Available for 395 of 745 hourly samples

Typical Observed Wind

SSW, 20mph
Mean: 18.3 mph
P10–P90: 3.2 — 26.7 mph
Recorded extremes

0 — 46.2 mph

Circular concentration: 68%

Available for 165 of 745 hourly samples

Mean Water Temperature

14.2°C
P10–P90: 13.8 — 14.5°C
Recorded extremes

13.8 — 14.7°C

Compared With Previous Octobers

Historical baseline from 4,467 observations across 7 years.

Wave Height
4.9ft
0.8ft above mean
Historical mean 4.068ft
Wave Period
5.7s
0.2s above mean
Historical mean 5.5s
Water Temperature
14.2°C
0.2°C above mean
Historical mean 14°C

Chart showing grouped wave observations for M2. 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 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; days run left to right.
M2 wave buoy daily means Oct 2017Last observation shown
Metric
Mean significant wave height (ft)4645544223757561016--------------
Mean maximum wave height (ft)696785622410711891422--------------
Mean peak period (s)654565544675766711--------------
Mean zero-crossing period (s)45445444345455568--------------
Mean peak wave directionSconcentration 98%WSWconcentration 88%WNWconcentration 98%SWconcentration 88%NWconcentration 55%NNWconcentration 33%WSWconcentration 62%WNWconcentration 48%SSWconcentration 64%SSEconcentration 97%SSWconcentration 78%SSWconcentration 89%Sconcentration 100%Sconcentration 100%Sconcentration 100%SSEconcentration 88%Sconcentration 100%--------------
Mean wave directionSconcentration 97%WSWconcentration 92%WNWconcentration 98%SWconcentration 90%WNWconcentration 73%NWconcentration 40%WSWconcentration 80%NWconcentration 38%SSWconcentration 80%Sconcentration 98%SSWconcentration 90%SSWconcentration 95%Sconcentration 100%Sconcentration 100%Sconcentration 100%SSEconcentration 91%Sconcentration 100%--------------
Mean directional spread (°)19.429.626.023.732.128.029.138.328.224.320.925.315.917.718.132.012.5--------------
Mean wind direction---------SWconcentration 96%SWconcentration 86%SWconcentration 91%SSWconcentration 89%SSWconcentration 90%Sconcentration 98%SSEconcentration 53%Nconcentration 100%--------------
Mean wind speed (mph)---------14212021152124---------------
Mean water temperature(°C)14.614.314.114.013.913.813.813.813.813.913.913.914.014.014.014.014.414.414.414.414.514.514.514.514.414.414.414.314.314.214.2

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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