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M2 wave buoy daily means for May 2004

Daily means from the M2 wave buoy for May 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

733 wave-buoy observations covered all 31 days. Typical wave height was 2 ft (10th–90th percentile 1–4.6 ft), while mean zero-crossing wave period was 4.3 seconds (10th–90th percentile 4–5 seconds). Typical wind was 10.4 mph (10th–90th percentile 4.6–19.6 mph) and mean water temperature was 10.6°C (10th–90th percentile 9.1–12.7°C). All 3,530 checked values passed quality control.

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

Typical Significant Wave Height

2ft
Mean: 2.4 ft
P10–P90: 1 — 4.6 ft
Recorded extremes

0.7 — 7.5 ft

Available for 614 of 733 hourly samples

Mean Observed Wave Period

4.3secs
P10–P90: 4 — 5secs
Recorded extremes

3 — 7secs

Available for 729 of 733 hourly samples

Typical Observed Wind

Variable, 10.4mph
Mean: 11 mph
P10–P90: 4.6 — 19.6 mph
Recorded extremes

2.3 — 29.9 mph

Circular concentration: 25%

Available for 728 of 733 hourly samples

Mean Water Temperature

10.6°C
P10–P90: 9.1 — 12.7°C
Recorded extremes

8.7 — 13.4°C

Available for 728 of 733 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 May 2004Last observation shown
Metric
Mean significant wave height (ft)5235542422321111122232112234432
Mean maximum wave height (ft)-------------------------------
Mean peak period (s)-------------------------------
Mean zero-crossing period (s)5445544444444454444444554445444
Mean peak wave direction-------------------------------
Mean wave direction-------------------------------
Mean directional spread (°)-------------------------------
Mean wind directionNNEconcentration 100%NWconcentration 61%Wconcentration 89%Wconcentration 71%WNWconcentration 98%WSWconcentration 77%WNWconcentration 90%NWconcentration 96%NWconcentration 84%NNWconcentration 85%Nconcentration 93%NNWconcentration 43%WSWconcentration 80%SWconcentration 90%SWconcentration 59%Sconcentration 91%SWconcentration 89%WSWconcentration 69%WSWconcentration 90%Nconcentration 89%Nconcentration 90%NNEconcentration 89%WSWconcentration 65%Variableconcentration 15%NEconcentration 82%NEconcentration 90%ESEconcentration 88%Sconcentration 98%Sconcentration 97%SSWconcentration 99%SEconcentration 75%
Mean wind speed (mph)17814192216913978678610111112914865891320161111
Mean water temperature(°C)8.99.29.29.19.09.29.39.29.29.49.49.59.810.310.911.511.811.711.710.910.110.410.811.712.512.812.712.111.812.912.8

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