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M2 wave buoy daily means for May 2015

Daily means from the M2 wave buoy for May 2015, 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

740 wave-buoy observations covered all 31 days. Typical wave height was 3.1 ft (10th–90th percentile 1.4–6 ft), while mean peak wave period was 5.3 seconds (10th–90th percentile 3.5–7.5 seconds). Typical wind was 15.2 mph (10th–90th percentile 7–23.6 mph) and mean water temperature was 9.4°C (10th–90th percentile 8.6–10.4°C). 3 of 4,437 checked values (0.1%) were excluded by quality control. Across 4 comparable years, mean wave height was above the same-month mean of 3 ft and mean wave period was above the same-month mean of 4.8 seconds.

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

Typical Significant Wave Height

3.1ft
Mean: 3.4 ft
P10–P90: 1.4 — 6 ft
Recorded extremes

0.5 — 9.1 ft

Mean Observed Wave Period

5.3secs
P10–P90: 3.5 — 7.5secs
Recorded extremes

2.1 — 15.2secs

Available for 737 of 740 hourly samples

Typical Observed Wind

SW, 15.2mph
Mean: 15.3 mph
P10–P90: 7 — 23.6 mph
Recorded extremes

0.8 — 34.4 mph

Circular concentration: 36%

Available for 737 of 740 hourly samples

Mean Water Temperature

9.4°C
P10–P90: 8.6 — 10.4°C
Recorded extremes

8.4 — 11°C

Compared With Previous Mays

Historical baseline from 2,938 observations across 4 years.

Wave Height
3.4ft
0.4ft above mean
Historical mean 3.018ft
Wave Period
5.3s
0.5s above mean
Historical mean 4.8s
Water Temperature
9.4°C
0.3°C below mean
Historical mean 9.7°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 May 2015Last observation shown
Metric
Mean significant wave height (ft)3554363246752443335322221234335
Mean maximum wave height (ft)488559435101072655457532221245447
Mean peak period (s)4567678576666675455545444444445
Mean zero-crossing period (s)3455455455554444444433433344444
Mean peak wave directionENEconcentration 90%Econcentration 88%ESEconcentration 69%Sconcentration 99%SSEconcentration 70%SSWconcentration 70%Sconcentration 92%SEconcentration 61%Variableconcentration 24%Sconcentration 100%Sconcentration 100%SSWconcentration 79%SSEconcentration 64%ENEconcentration 92%Sconcentration 89%Wconcentration 73%SSWconcentration 83%SWconcentration 67%WNWconcentration 94%NWconcentration 56%SWconcentration 64%SSEconcentration 61%NEconcentration 49%WNWconcentration 43%WNWconcentration 59%NWconcentration 71%Variableconcentration 23%Wconcentration 97%WNWconcentration 84%Wconcentration 46%Wconcentration 60%
Mean wave directionENEconcentration 94%ESEconcentration 93%ESEconcentration 80%Sconcentration 99%SSEconcentration 80%SSWconcentration 90%SSEconcentration 76%SEconcentration 75%Variableconcentration 11%Sconcentration 100%Sconcentration 100%SSWconcentration 94%SSEconcentration 82%Econcentration 99%SSEconcentration 85%WSWconcentration 89%SSWconcentration 89%SWconcentration 80%WNWconcentration 92%NWconcentration 57%SSWconcentration 75%Sconcentration 80%ENEconcentration 48%WNWconcentration 41%Wconcentration 56%NNWconcentration 89%Variableconcentration 26%WSWconcentration 99%Wconcentration 86%WSWconcentration 46%WSWconcentration 70%
Mean directional spread (°)25.230.430.421.726.724.327.533.233.919.118.628.039.827.921.331.927.630.528.935.630.431.535.227.233.531.927.132.129.525.528.0
Mean wind directionEconcentration 98%ESEconcentration 97%SSEconcentration 68%Sconcentration 76%Sconcentration 40%Wconcentration 79%Variableconcentration 17%Econcentration 57%Wconcentration 51%Sconcentration 100%SSWconcentration 90%WSWconcentration 89%NEconcentration 64%Econcentration 97%Sconcentration 76%Wconcentration 97%SWconcentration 94%WSWconcentration 91%WNWconcentration 96%Wconcentration 84%SWconcentration 78%Wconcentration 60%Variableconcentration 26%Wconcentration 72%Wconcentration 63%NNWconcentration 54%WSWconcentration 68%Wconcentration 87%Wconcentration 87%SWconcentration 63%Wconcentration 81%
Mean wind speed (mph)162017151721911152523178181615171621151398111081517161820
Mean water temperature(°C)8.58.58.68.78.78.79.08.89.08.99.09.39.69.29.19.49.49.59.49.59.59.69.69.910.110.310.010.510.610.510.3

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