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M2 wave buoy daily means for Apr 2023

Daily means from the M2 wave buoy for Apr 2023, 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

694 wave-buoy observations covered all 30 days. Typical wave height was 2.7 ft (10th–90th percentile 1.5–5.8 ft), while mean peak wave period was 5.5 seconds (10th–90th percentile 3.2–8.3 seconds). Typical wind was 14.5 mph (10th–90th percentile 6.2–24.2 mph) and mean water temperature was 9.4°C (10th–90th percentile 9.1–10°C). 8 of 4,164 checked values (0.2%) were excluded by quality control. Across 11 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 5.1 seconds.

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

Typical Significant Wave Height

2.7ft
Mean: 3.2 ft
P10–P90: 1.5 — 5.8 ft
Recorded extremes

0.8 — 10.8 ft

Mean Observed Wave Period

5.5secs
P10–P90: 3.2 — 8.3secs
Recorded extremes

2.5 — 15.4secs

Available for 686 of 694 hourly samples

Typical Observed Wind

Variable, 14.5mph
Mean: 15.1 mph
P10–P90: 6.2 — 24.2 mph
Recorded extremes

1.3 — 36.7 mph

Circular concentration: 24%

Mean Water Temperature

9.4°C
P10–P90: 9.1 — 10°C
Recorded extremes

9 — 10.9°C

Compared With Previous Aprils

Historical baseline from 7,851 observations across 11 years.

Wave Height
3.2ft
0.2ft above mean
Historical mean 2.953ft
Wave Period
5.5s
0.4s above mean
Historical mean 5.1s
Water Temperature
9.4°C
0.7°C above mean
Historical mean 8.7°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 Apr 2023Last observation shown
Metric
Mean significant wave height (ft)4234QC rejected2225568522323555223222222
Mean maximum wave height (ft)6366833388912933544888425334334
Mean peak period (s)-64564455667565557566575544564
Mean zero-crossing period (s)544454434455544444444444434444
Mean peak wave directionSconcentration 99%Variableconcentration 30%SEconcentration 86%Sconcentration 99%Sconcentration 99%WNWconcentration 46%SSEconcentration 39%SSEconcentration 89%Sconcentration 99%Sconcentration 81%SSWconcentration 78%SWconcentration 63%WNWconcentration 96%SSWconcentration 68%WSWconcentration 39%Sconcentration 98%Sconcentration 95%ESEconcentration 54%ENEconcentration 94%ENEconcentration 94%NEconcentration 90%NEconcentration 66%Sconcentration 37%NEconcentration 85%Econcentration 47%SEconcentration 81%SEconcentration 80%ESEconcentration 62%Sconcentration 95%Sconcentration 96%
Mean wave directionSSEconcentration 86%Econcentration 64%SEconcentration 90%Sconcentration 99%Sconcentration 99%WSWconcentration 55%SEconcentration 60%SSEconcentration 96%Sconcentration 100%SSWconcentration 87%SSWconcentration 86%SWconcentration 79%Wconcentration 97%Sconcentration 92%SWconcentration 53%Sconcentration 99%Sconcentration 96%Econcentration 80%ENEconcentration 96%ENEconcentration 97%ENEconcentration 93%NEconcentration 71%SEconcentration 36%NEconcentration 94%Econcentration 64%SEconcentration 82%SEconcentration 93%SEconcentration 84%Sconcentration 99%Sconcentration 98%
Mean directional spread (°)100.2150.5168.1162.3129.8190.9203.6164.0147.5141.4165.1134.0173.2178.9132.5184.1167.3151.0137.9127.8140.4199.7138.9174.4178.8157.3198.8180.9104.2159.3
Mean wind directionNconcentration 86%NEconcentration 77%SSEconcentration 94%Sconcentration 98%SSWconcentration 91%NWconcentration 74%ESEconcentration 87%SEconcentration 97%SSEconcentration 96%SWconcentration 85%SWconcentration 60%Wconcentration 71%Wconcentration 95%NWconcentration 59%Variableconcentration 21%Sconcentration 96%SSEconcentration 69%ENEconcentration 97%ENEconcentration 99%ENEconcentration 98%NEconcentration 96%ENEconcentration 45%NNWconcentration 60%NNEconcentration 94%Econcentration 78%ESEconcentration 76%SEconcentration 89%Variableconcentration 13%SSEconcentration 73%Sconcentration 87%
Mean wind speed (mph)10101720181110142320262723713151317222219109177111361013
Mean water temperature(°C)9.29.39.19.19.19.29.39.29.29.29.29.19.19.39.49.49.59.59.39.39.39.39.49.49.69.69.610.210.310.3

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