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M2 wave buoy daily means for Sep 2013

Daily means from the M2 wave buoy for Sep 2013, 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

701 wave-buoy observations covered all 30 days. Typical wave height was 2.6 ft (10th–90th percentile 1–5.6 ft), while mean peak wave period was 5.4 seconds (10th–90th percentile 3.4–8.6 seconds). Typical wind was 13.4 mph (10th–90th percentile 6.1–18.4 mph) and mean water temperature was 14.7°C (10th–90th percentile 14.5–14.9°C). 1 of 2,295 checked values (0%) were excluded by quality control. Across 3 comparable years, mean wave height was below the same-month mean of 3.8 ft and mean wave period was above the same-month mean of 4.9 seconds.

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

Typical Significant Wave Height

2.6ft
Mean: 3 ft
P10–P90: 1 — 5.6 ft
Recorded extremes

0.5 — 8.7 ft

Mean Observed Wave Period

5.4secs
P10–P90: 3.4 — 8.6secs
Recorded extremes

2.2 — 11.7secs

Available for 700 of 701 hourly samples

Typical Observed Wind

WSW, 13.4mph
Mean: 12.8 mph
P10–P90: 6.1 — 18.4 mph
Recorded extremes

2.8 — 21.1 mph

Circular concentration: 85%

Available for 64 of 701 hourly samples

Mean Water Temperature

14.7°C
P10–P90: 14.5 — 14.9°C
Recorded extremes

14.4 — 14.9°C

Available for 64 of 701 hourly samples

Compared With Previous Septembers

Historical baseline from 2,003 observations across 3 years.

Wave Height
3ft
0.8ft below mean
Historical mean 3.773ft
Wave Period
5.4s
0.5s above mean
Historical mean 4.9s
Water Temperature
14.7°C
0.1°C above mean
Historical mean 14.6°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 Sep 2013Last observation shown
Metric
Mean significant wave height (ft)321324532431226733432211142454
Mean maximum wave height (ft)432425743742339955643212163586
Mean peak period (s)444445644544446655555467969976
Mean zero-crossing period (s)443344444443335544444434544555
Mean peak wave directionWNWconcentration 89%WSWconcentration 73%SWconcentration 61%SWconcentration 84%NNEconcentration 36%NEconcentration 75%Nconcentration 36%SWconcentration 68%Wconcentration 58%NNEconcentration 82%NWconcentration 68%Variableconcentration 20%Nconcentration 74%NNEconcentration 73%SWconcentration 55%WNWconcentration 82%WSWconcentration 59%WNWconcentration 64%WSWconcentration 59%WSWconcentration 37%Sconcentration 81%Sconcentration 83%SSWconcentration 47%Sconcentration 55%Sconcentration 61%Econcentration 76%SSEconcentration 61%SSEconcentration 59%ENEconcentration 86%ENEconcentration 96%
Mean wave directionWNWconcentration 92%WSWconcentration 91%SWconcentration 86%SWconcentration 86%Variableconcentration 17%NNEconcentration 81%NNWconcentration 41%SWconcentration 84%Wconcentration 46%Nconcentration 90%NWconcentration 80%Variableconcentration 22%Nconcentration 84%Nconcentration 75%SWconcentration 66%WNWconcentration 85%WSWconcentration 64%WNWconcentration 69%WSWconcentration 64%WSWconcentration 46%Sconcentration 88%Sconcentration 92%SSEconcentration 74%Sconcentration 69%Sconcentration 75%Econcentration 76%SSEconcentration 88%ESEconcentration 82%ENEconcentration 96%Econcentration 98%
Mean directional spread (°)33.342.445.041.250.644.147.243.944.046.441.048.543.238.144.941.750.445.543.450.649.649.455.054.758.542.755.053.542.342.4
Mean wind directionWconcentration 98%WSWconcentration 89%SWconcentration 68%---------------------------
Mean wind speed (mph)151211---------------------------
Mean water temperature(°C)14.614.714.7---------------------------

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