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M2 wave buoy daily means for Oct 2004

Daily means from the M2 wave buoy for Oct 2004, 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

718 wave-buoy observations covered all 31 days. Typical wave height was 5.2 ft (10th–90th percentile 2.3–8.2 ft), while mean zero-crossing wave period was 5.2 seconds (10th–90th percentile 4–6 seconds). Typical wind was 20.7 mph (10th–90th percentile 9.2–28.8 mph) and mean water temperature was 14.1°C (10th–90th percentile 13.9–14.4°C). All 3,542 checked values passed quality control.

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

Typical Significant Wave Height

5.2ft
Mean: 5.4 ft
P10–P90: 2.3 — 8.2 ft
Recorded extremes

1 — 13.8 ft

Available for 705 of 718 hourly samples

Mean Observed Wave Period

5.2secs
P10–P90: 4 — 6secs
Recorded extremes

4 — 8secs

Available for 709 of 718 hourly samples

Typical Observed Wind

Variable, 20.7mph
Mean: 20.3 mph
P10–P90: 9.2 — 28.8 mph
Recorded extremes

2.3 — 38 mph

Circular concentration: 13%

Available for 705 of 718 hourly samples

Mean Water Temperature

14.1°C
P10–P90: 13.9 — 14.4°C
Recorded extremes

13.8 — 14.6°C

Available for 709 of 718 hourly samples

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 2004Last observation shown
Metric
Mean significant wave height (ft)56678643576344455453877874810641
Mean maximum wave height (ft)-------------------------------
Mean peak period (s)-------------------------------
Mean zero-crossing period (s)5556654456555555545566766567654
Mean peak wave direction-------------------------------
Mean wave direction-------------------------------
Mean directional spread (°)-------------------------------
Mean wind directionSSWconcentration 89%SWconcentration 96%SWconcentration 89%SWconcentration 79%SWconcentration 91%Wconcentration 98%NWconcentration 87%NEconcentration 88%Econcentration 99%Econcentration 99%ESEconcentration 98%SSEconcentration 50%Sconcentration 93%WNWconcentration 96%NWconcentration 96%Nconcentration 90%NNWconcentration 97%Wconcentration 84%SWconcentration 90%ENEconcentration 72%WSWconcentration 91%Variableconcentration 25%NEconcentration 31%Sconcentration 95%Wconcentration 95%SSWconcentration 85%ESEconcentration 91%SEconcentration 93%ENEconcentration 91%NNEconcentration 99%NNWconcentration 87%
Mean wind speed (mph)212421272727161323252281718212122191815301716272316282720168
Mean water temperature(°C)14.414.414.314.414.414.214.014.214.314.214.214.114.114.214.114.114.114.214.114.014.013.913.914.014.014.014.013.914.014.013.9

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 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