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M2 wave buoy daily means for Feb 2021

Daily means from the M2 wave buoy for Feb 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

655 wave-buoy observations covered all 28 days. Typical wave height was 6.2 ft (10th–90th percentile 2.1–11.3 ft), while mean peak wave period was 7.7 seconds (10th–90th percentile 5–11 seconds). Typical wind was 21.6 mph (10th–90th percentile 10–31.1 mph) and mean water temperature was 8.5°C (10th–90th percentile 8.2–8.9°C). 6 of 3,930 checked values (0.2%) were excluded by quality control. Across 11 comparable years, mean wave height was above the same-month mean of 4.6 ft and mean wave period was above the same-month mean of 5.7 seconds.

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

Typical Significant Wave Height

6.2ft
Mean: 6.4 ft
P10–P90: 2.1 — 11.3 ft
Recorded extremes

0.5 — 16.4 ft

Available for 654 of 655 hourly samples

Mean Observed Wave Period

7.7secs
P10–P90: 5 — 11secs
Recorded extremes

2.1 — 18.3secs

Available for 650 of 655 hourly samples

Typical Observed Wind

SSE, 21.6mph
Mean: 20.8 mph
P10–P90: 10 — 31.1 mph
Recorded extremes

1.1 — 40.4 mph

Circular concentration: 61%

Mean Water Temperature

8.5°C
P10–P90: 8.2 — 8.9°C
Recorded extremes

7.9 — 9°C

Compared With Previous Februarys

Historical baseline from 5,606 observations across 11 years.

Wave Height
6.4ft
1.8ft above mean
Historical mean 4.626ft
Wave Period
7.7s
2s above mean
Historical mean 5.7s
Water Temperature
8.5°C
0.2°C below 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 Feb 2021Last observation shown
Metric
Mean significant wave height (ft)46452598756811126778119641374321
Mean maximum wave height (ft)6868381312108912161889101216139519106421
Mean peak period (s)7686767776678978698910991011869
Mean zero-crossing period (s)5555456554556655566655665444
Mean peak wave directionESEconcentration 69%ESEconcentration 77%SSEconcentration 91%Sconcentration 100%Sconcentration 92%NNEconcentration 79%ENEconcentration 100%ENEconcentration 100%ENEconcentration 100%ENEconcentration 98%ESEconcentration 90%SEconcentration 94%SSEconcentration 91%Sconcentration 99%Sconcentration 99%Sconcentration 99%Sconcentration 99%Sconcentration 100%Sconcentration 100%Sconcentration 100%Sconcentration 100%Sconcentration 100%Sconcentration 100%Sconcentration 99%Sconcentration 100%Sconcentration 99%Sconcentration 97%SSEconcentration 86%
Mean wave directionESEconcentration 88%SEconcentration 87%Sconcentration 99%Sconcentration 100%Sconcentration 95%NEconcentration 88%ENEconcentration 100%ENEconcentration 100%ENEconcentration 100%ENEconcentration 99%ESEconcentration 94%SEconcentration 98%SSEconcentration 96%SSEconcentration 100%Sconcentration 99%Sconcentration 100%Sconcentration 100%Sconcentration 100%Sconcentration 100%Sconcentration 100%Sconcentration 100%Sconcentration 100%Sconcentration 100%Sconcentration 100%Sconcentration 99%Sconcentration 100%Sconcentration 99%SSEconcentration 94%
Mean directional spread (°)39.746.837.725.028.232.022.122.822.325.831.738.833.224.822.323.121.521.518.621.622.122.519.422.421.925.936.837.7
Mean wind directionESEconcentration 83%SSEconcentration 73%SSWconcentration 94%Sconcentration 98%WNWconcentration 79%ENEconcentration 97%Econcentration 99%Econcentration 98%Econcentration 99%Econcentration 98%SEconcentration 98%SEconcentration 99%SSEconcentration 98%SSEconcentration 96%Sconcentration 97%SSWconcentration 98%Sconcentration 98%SSWconcentration 90%Sconcentration 99%Sconcentration 95%Sconcentration 98%SSWconcentration 95%Sconcentration 99%SSWconcentration 97%WSWconcentration 97%SSWconcentration 94%SSWconcentration 98%ESEconcentration 76%
Mean wind speed (mph)121716229192725252024233031222324253126201633211414107
Mean water temperature(°C)8.98.98.99.08.78.88.98.88.78.68.28.28.28.38.38.38.28.28.48.68.68.58.58.58.48.38.38.4

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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