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M2 wave buoy daily means for May 2018

Daily means from the M2 wave buoy for May 2018, 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

737 wave-buoy observations covered all 31 days. Typical wave height was 2.1 ft (10th–90th percentile 1–4.6 ft), while mean peak wave period was 5.1 seconds (10th–90th percentile 3.4–7.4 seconds). Typical wind was 12.4 mph (10th–90th percentile 5.5–20.6 mph). 7 of 3,681 checked values (0.2%) were excluded by quality control. Across 7 comparable years, mean wave height was below the same-month mean of 3 ft and mean wave period was the same as the same-month mean of 5.1 seconds.

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

Typical Significant Wave Height

2.1ft
Mean: 2.6 ft
P10–P90: 1 — 4.6 ft
Recorded extremes

0.5 — 10.3 ft

Available for 735 of 737 hourly samples

Mean Observed Wave Period

5.1secs
P10–P90: 3.4 — 7.4secs
Recorded extremes

2.2 — 23.8secs

Available for 730 of 737 hourly samples

Typical Observed Wind

Variable, 12.4mph
Mean: 13.1 mph
P10–P90: 5.5 — 20.6 mph
Recorded extremes

1.6 — 34.4 mph

Circular concentration: 22%

Available for 735 of 737 hourly samples

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 737 hourly samples

Compared With Previous Mays

Historical baseline from 5,161 observations across 7 years.

Wave Height
2.6ft
0.4ft below mean
Historical mean 2.953ft
Wave Period
5.1s
In line with the historical mean
Historical mean 5.1s
Water Temperature
–
Not enough comparable data
Historical mean 9.8°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 2018Last observation shown
Metric
Mean significant wave height (ft)553242233362221QC rejected212324222341121
Mean maximum wave height (ft)7753533444932217203435323451120
Mean peak period (s)5965544554686566456455445554345
Mean zero-crossing period (s)4544433444554344344444434444344
Mean peak wave directionSconcentration 92%Sconcentration 80%Sconcentration 84%Sconcentration 93%Sconcentration 98%Sconcentration 97%Sconcentration 98%Sconcentration 89%Sconcentration 89%SWconcentration 86%Sconcentration 100%Sconcentration 100%Sconcentration 86%Sconcentration 91%SSEconcentration 54%NNEconcentration 99%ENEconcentration 80%Variableconcentration 26%Sconcentration 69%Sconcentration 99%SSEconcentration 40%NNEconcentration 97%NEconcentration 95%NEconcentration 95%NNEconcentration 86%NEconcentration 98%NEconcentration 97%NEconcentration 77%NEconcentration 76%NEconcentration 80%Variableconcentration 19%
Mean wave directionSconcentration 97%SWconcentration 81%SSWconcentration 90%Sconcentration 99%Sconcentration 99%Sconcentration 98%Sconcentration 99%Sconcentration 96%Sconcentration 98%SSWconcentration 93%Sconcentration 100%Sconcentration 99%Sconcentration 94%Sconcentration 97%SSEconcentration 66%NNEconcentration 99%ENEconcentration 82%SEconcentration 70%Sconcentration 90%Sconcentration 99%Sconcentration 49%NNEconcentration 99%NEconcentration 98%ENEconcentration 95%NNEconcentration 97%NEconcentration 99%NEconcentration 98%NEconcentration 89%NEconcentration 95%NEconcentration 94%ENEconcentration 35%
Mean directional spread (°)24.026.225.332.621.624.120.122.627.928.317.922.426.131.333.222.634.634.228.524.429.924.428.929.621.926.928.133.432.731.832.4
Mean wind directionSSWconcentration 93%Wconcentration 87%SWconcentration 88%SWconcentration 68%Sconcentration 99%Sconcentration 98%Sconcentration 97%SSWconcentration 80%SSWconcentration 88%SWconcentration 79%Sconcentration 92%Sconcentration 97%SWconcentration 68%Sconcentration 98%SSWconcentration 51%NNEconcentration 97%Econcentration 94%SSEconcentration 53%Sconcentration 97%Sconcentration 99%Variableconcentration 22%Nconcentration 95%NEconcentration 95%NEconcentration 83%NNEconcentration 97%NEconcentration 99%ENEconcentration 96%NNEconcentration 78%NEconcentration 96%NNEconcentration 85%SEconcentration 35%
Mean wind speed (mph)22161711181314151517218101191910515171214111113151361184
Mean water temperature(°C)-------------------------------

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