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M2 wave buoy daily means for Oct 2018

Daily means from the M2 wave buoy for Oct 2018, 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

735 wave-buoy observations covered all 31 days. Typical wave height was 3.1 ft (10th–90th percentile 2.1–5.1 ft), while mean peak wave period was 5.7 seconds (10th–90th percentile 3.6–9.1 seconds). Typical wind was 15.9 mph (10th–90th percentile 7.4–24.9 mph) and mean water temperature was 13.4°C (10th–90th percentile 13.2–13.7°C). All 3,856 checked values passed quality control. Across 8 comparable years, mean wave height was below the same-month mean of 4.1 ft and mean wave period was above the same-month mean of 5.5 seconds.

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

Typical Significant Wave Height

3.1ft
Mean: 3.6 ft
P10–P90: 2.1 — 5.1 ft
Recorded extremes

1.5 — 6.7 ft

Available for 181 of 735 hourly samples

Mean Observed Wave Period

5.7secs
P10–P90: 3.6 — 9.1secs
Recorded extremes

2.8 — 14.9secs

Typical Observed Wind

Variable, 15.9mph
Mean: 16.3 mph
P10–P90: 7.4 — 24.9 mph
Recorded extremes

0.9 — 40.2 mph

Circular concentration: 26%

Mean Water Temperature

13.4°C
P10–P90: 13.2 — 13.7°C
Recorded extremes

13 — 13.9°C

Compared With Previous Octobers

Historical baseline from 5,212 observations across 8 years.

Wave Height
3.6ft
0.5ft below mean
Historical mean 4.134ft
Wave Period
5.7s
0.2s above mean
Historical mean 5.5s
Water Temperature
13.4°C
0.6°C below mean
Historical mean 14°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 Oct 2018Last observation shown
Metric
Mean significant wave height (ft)44243445-----------------------
Mean maximum wave height (ft)56355657-----------------------
Mean peak period (s)554555567569121196654544554566446
Mean zero-crossing period (s)44344445-----------------------
Mean peak wave directionNWconcentration 80%WNWconcentration 59%WSWconcentration 66%Sconcentration 97%NNEconcentration 50%NNEconcentration 96%SSWconcentration 39%Sconcentration 98%Sconcentration 99%SSEconcentration 83%SSEconcentration 94%SSEconcentration 99%Sconcentration 97%Sconcentration 92%Sconcentration 82%SSEconcentration 93%Sconcentration 87%Variableconcentration 29%Sconcentration 82%Sconcentration 98%SSWconcentration 30%NWconcentration 87%WNWconcentration 98%NWconcentration 96%NWconcentration 95%NWconcentration 87%Nconcentration 97%NEconcentration 90%Econcentration 80%Econcentration 65%Sconcentration 98%
Mean wave directionNWconcentration 83%Wconcentration 82%WSWconcentration 66%Sconcentration 99%NEconcentration 52%NNEconcentration 97%Variableconcentration 27%Sconcentration 97%-----------------------
Mean directional spread (°)30.730.931.719.833.526.023.820.918.130.428.119.123.831.537.425.927.345.126.618.523.429.122.927.831.422.924.325.836.942.219.9
Mean wind directionWNWconcentration 85%WNWconcentration 94%WSWconcentration 86%SSWconcentration 87%Nconcentration 98%Nconcentration 96%SWconcentration 79%SSWconcentration 100%SSWconcentration 98%SEconcentration 92%SSEconcentration 84%Sconcentration 94%SSWconcentration 59%NNWconcentration 76%ENEconcentration 82%SSWconcentration 95%WNWconcentration 72%ENEconcentration 47%SSWconcentration 97%SSWconcentration 97%Wconcentration 40%WNWconcentration 94%WNWconcentration 99%WNWconcentration 99%WNWconcentration 95%NWconcentration 94%Nconcentration 95%NEconcentration 99%SEconcentration 96%SSEconcentration 46%SSWconcentration 83%
Mean wind speed (mph)18151316151719232514172716109181261111171823181725241813714
Mean water temperature(°C)13.613.613.713.713.613.513.413.513.513.513.513.513.513.513.513.413.413.513.413.513.513.413.413.513.413.413.313.213.113.113.0

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