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M2 wave buoy daily means for Mar 2021

Daily means from the M2 wave buoy for Mar 2021, 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 2.8 ft (10th–90th percentile 1–7.7 ft), while mean peak wave period was 5.2 seconds (10th–90th percentile 3.3–7.7 seconds). Typical wind was 14.2 mph (10th–90th percentile 6.9–27.5 mph) and mean water temperature was 8.4°C (10th–90th percentile 8.2–8.5°C). 10 of 4,398 checked values (0.2%) were excluded by quality control. Across 10 comparable years, mean wave height was above the same-month mean of 3.7 ft and mean wave period was below the same-month mean of 5.5 seconds.

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

Typical Significant Wave Height

2.8ft
Mean: 3.8 ft
P10–P90: 1 — 7.7 ft
Recorded extremes

0.5 — 13.3 ft

Available for 732 of 733 hourly samples

Mean Observed Wave Period

5.2secs
P10–P90: 3.3 — 7.7secs
Recorded extremes

2.1 — 14.9secs

Available for 724 of 733 hourly samples

Typical Observed Wind

WSW, 14.2mph
Mean: 16.3 mph
P10–P90: 6.9 — 27.5 mph
Recorded extremes

0.2 — 36.7 mph

Circular concentration: 39%

Mean Water Temperature

8.4°C
P10–P90: 8.2 — 8.5°C
Recorded extremes

8.1 — 8.9°C

Compared With Previous Marchs

Historical baseline from 7,083 observations across 10 years.

Wave Height
3.8ft
0.1ft above mean
Historical mean 3.74ft
Wave Period
5.2s
0.3s below mean
Historical mean 5.5s
Water Temperature
8.4°C
0.2°C above mean
Historical mean 8.2°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 Mar 2021Last observation shown
Metric
Mean significant wave height (ft)2222311259877522223121545669831
Mean maximum wave height (ft)332342137131291173333512076799121141
Mean peak period (s)4444464468766555455443566668857
Mean zero-crossing period (s)3433443346655444444333444556545
Mean peak wave directionENEconcentration 96%Econcentration 89%ENEconcentration 94%NEconcentration 90%Econcentration 88%SSEconcentration 89%SWconcentration 70%SSWconcentration 83%Sconcentration 99%Sconcentration 100%SWconcentration 82%SWconcentration 90%Wconcentration 93%Wconcentration 98%WSWconcentration 31%NWconcentration 60%Nconcentration 82%Nconcentration 93%NNEconcentration 89%NNWconcentration 44%NNWconcentration 78%SWconcentration 64%Sconcentration 97%Sconcentration 99%Sconcentration 99%SSWconcentration 85%SSWconcentration 86%Sconcentration 99%Sconcentration 99%Sconcentration 90%SSEconcentration 86%
Mean wave directionEconcentration 98%Econcentration 88%ENEconcentration 98%NEconcentration 92%Econcentration 95%SSEconcentration 97%SWconcentration 86%SSWconcentration 92%Sconcentration 100%Sconcentration 100%SWconcentration 95%SSWconcentration 96%WSWconcentration 94%Wconcentration 97%WSWconcentration 31%WNWconcentration 61%Nconcentration 85%Nconcentration 95%NNEconcentration 96%NNWconcentration 56%Nconcentration 80%SWconcentration 71%Sconcentration 100%Sconcentration 99%Sconcentration 100%SSWconcentration 93%SSWconcentration 90%Sconcentration 100%Sconcentration 100%Sconcentration 99%SSEconcentration 95%
Mean directional spread (°)27.239.630.532.335.228.528.426.120.619.729.627.228.429.239.626.835.228.126.029.127.034.019.519.020.524.528.222.424.732.635.3
Mean wind directionEconcentration 82%ENEconcentration 70%NNEconcentration 97%NEconcentration 85%ESEconcentration 74%SSWconcentration 93%WSWconcentration 84%SWconcentration 91%SSWconcentration 98%SSWconcentration 96%WSWconcentration 94%SWconcentration 97%Wconcentration 98%Wconcentration 97%Wconcentration 81%NWconcentration 88%NNWconcentration 81%NNWconcentration 98%Nconcentration 96%NWconcentration 82%NNWconcentration 34%SWconcentration 90%SSWconcentration 97%SSWconcentration 96%SSWconcentration 97%SWconcentration 90%SWconcentration 85%SSWconcentration 99%SSWconcentration 99%Sconcentration 91%Variableconcentration 20%
Mean wind speed (mph)139121411811132323272527231214101313810819172124262826136
Mean water temperature(°C)8.58.58.58.58.58.58.58.48.28.38.38.38.38.28.38.48.48.48.38.38.48.48.48.38.38.28.28.38.38.38.5

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