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M2 wave buoy daily means for Dec 2009

Daily means from the M2 wave buoy for Dec 2009, 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

465 wave-buoy observations covered 21 of 31 days (68%). Typical wave height was 3.9 ft (10th–90th percentile 2.6–8.9 ft), while mean zero-crossing wave period was 4.5 seconds (10th–90th percentile 4–6 seconds). Typical wind was 20.7 mph (10th–90th percentile 12–32.9 mph) and mean water temperature was 11.2°C (10th–90th percentile 10.4–12°C). All 2,314 checked values passed quality control.

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

Typical Significant Wave Height

3.9ft
Mean: 5 ft
P10–P90: 2.6 — 8.9 ft
Recorded extremes

1.3 — 16.1 ft

Mean Observed Wave Period

4.5secs
P10–P90: 4 — 6secs
Recorded extremes

3 — 7secs

Typical Observed Wind

Variable, 20.7mph
Mean: 21.4 mph
P10–P90: 12 — 32.9 mph
Recorded extremes

3.5 — 48.3 mph

Circular concentration: 17%

Mean Water Temperature

11.2°C
P10–P90: 10.4 — 12°C
Recorded extremes

7.1 — 12.1°C

Available for 454 of 465 hourly samples

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 Dec 2009Last observation shown
Metric
Mean significant wave height (ft)---------234-4546646443435629128
Mean maximum wave height (ft)-------------------------------
Mean peak period (s)-------------------------------
Mean zero-crossing period (s)---------544-454554444444554666
Mean peak wave direction-------------------------------
Mean wave direction-------------------------------
Mean directional spread (°)-------------------------------
Mean wind direction---------SSEconcentration 81%ESEconcentration 98%ESEconcentration 90%-Nconcentration 95%NNEconcentration 99%Nconcentration 82%NEconcentration 97%NNEconcentration 88%WNWconcentration 87%Wconcentration 90%WSWconcentration 97%WSWconcentration 96%Variableconcentration 10%NEconcentration 95%WSWconcentration 49%SSWconcentration 96%Wconcentration 96%Econcentration 54%Econcentration 99%ENEconcentration 98%NEconcentration 93%
Mean wind speed (mph)---------10159-192220242322272022151916192611323925
Mean water temperature(°C)---------12.012.012.0-12.012.011.911.811.711.511.311.211.110.910.910.610.210.110.410.710.610.4

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