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M2 wave buoy daily means for Apr 2024

Daily means from the M2 wave buoy for Apr 2024, 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

700 wave-buoy observations covered all 30 days. Typical wave height was 3.8 ft (10th–90th percentile 1.5–7.7 ft), while mean peak wave period was 5.8 seconds (10th–90th percentile 3.3–9.1 seconds). Typical wind was 16.5 mph (10th–90th percentile 6.8–27 mph) and mean water temperature was 9.6°C (10th–90th percentile 9.3–9.9°C). 2 of 4,200 checked values (0%) were excluded by quality control. Across 12 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 5.2 seconds.

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

Typical Significant Wave Height

3.8ft
Mean: 4.4 ft
P10–P90: 1.5 — 7.7 ft
Recorded extremes

0.4 — 15.8 ft

Mean Observed Wave Period

5.8secs
P10–P90: 3.3 — 9.1secs
Recorded extremes

2.6 — 16.6secs

Available for 698 of 700 hourly samples

Typical Observed Wind

Variable, 16.5mph
Mean: 16.8 mph
P10–P90: 6.8 — 27 mph
Recorded extremes

1 — 35.5 mph

Circular concentration: 18%

Mean Water Temperature

9.6°C
P10–P90: 9.3 — 9.9°C
Recorded extremes

9.2 — 10.7°C

Compared With Previous Aprils

Historical baseline from 8,545 observations across 12 years.

Wave Height
4.4ft
1.4ft above mean
Historical mean 2.986ft
Wave Period
5.8s
0.6s above mean
Historical mean 5.2s
Water Temperature
9.6°C
0.8°C above mean
Historical mean 8.8°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 Apr 2024Last observation shown
Metric
Mean significant wave height (ft)425481110475565475423212322222QC rejectedQC rejected
Mean maximum wave height (ft)748613181671297986128645313543344109
Mean peak period (s)57810899116676556554544454344477
Mean zero-crossing period (s)455556655555445443433444333355
Mean peak wave directionENEconcentration 97%SSEconcentration 48%ESEconcentration 31%Sconcentration 91%Sconcentration 100%Sconcentration 99%Sconcentration 100%Sconcentration 99%NWconcentration 86%SSEconcentration 69%Sconcentration 99%Sconcentration 99%SSWconcentration 84%SWconcentration 80%Wconcentration 70%NNWconcentration 89%NNWconcentration 93%WNWconcentration 47%NWconcentration 82%NNEconcentration 67%ENEconcentration 57%NNEconcentration 70%NNEconcentration 89%NNEconcentration 70%NNWconcentration 64%ENEconcentration 83%ENEconcentration 93%Econcentration 38%Sconcentration 99%Sconcentration 98%
Mean wave directionENEconcentration 99%SEconcentration 48%NNEconcentration 49%SSEconcentration 81%Sconcentration 99%Sconcentration 100%Sconcentration 100%Sconcentration 97%NWconcentration 97%Sconcentration 68%Sconcentration 100%Sconcentration 100%SSWconcentration 90%SWconcentration 90%Wconcentration 80%NNWconcentration 92%NNWconcentration 94%WNWconcentration 42%NWconcentration 77%NEconcentration 72%Econcentration 81%NNEconcentration 58%NNEconcentration 89%NNEconcentration 79%NNWconcentration 54%ENEconcentration 94%ENEconcentration 96%ENEconcentration 43%Sconcentration 99%Sconcentration 98%
Mean directional spread (°)187.6116.8163.188.3103.6107.1104.1108.0168.4180.4142.7136.2194.8218.8138.2198.1230.0187.3226.5240.8259.2194.6234.3231.2238.7190.0196.0226.3135.2131.6
Mean wind directionNEconcentration 91%Variableconcentration 20%NNWconcentration 40%Econcentration 54%SSWconcentration 98%Sconcentration 94%SSWconcentration 98%SEconcentration 46%NWconcentration 93%SSWconcentration 88%SSWconcentration 95%SSWconcentration 98%SWconcentration 80%WSWconcentration 90%WNWconcentration 95%NWconcentration 96%NWconcentration 94%Wconcentration 83%NWconcentration 89%Nconcentration 57%NNEconcentration 65%NWconcentration 89%Nconcentration 90%NEconcentration 34%NNWconcentration 74%NEconcentration 96%NEconcentration 94%Variableconcentration 29%SSWconcentration 94%SEconcentration 97%
Mean wind speed (mph)169151125312713242118232119271816131595111112121214122219
Mean water temperature(°C)9.29.39.39.49.49.69.69.59.69.79.79.59.59.59.59.79.79.79.79.89.99.89.99.89.89.89.89.99.89.8

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