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M2 wave buoy daily means for Sep 2017

Daily means from the M2 wave buoy for Sep 2017, 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

719 wave-buoy observations covered all 30 days. Typical wave height was 3.5 ft (10th–90th percentile 1.5–6.4 ft), while mean peak wave period was 5.5 seconds (10th–90th percentile 3.6–7.7 seconds). Typical wind was 15.4 mph (10th–90th percentile 5.6–23.3 mph) and mean water temperature was 14.6°C (10th–90th percentile 14.4–14.8°C). 1 of 3,910 checked values (0%) were excluded by quality control. Across 6 comparable years, mean wave height was above the same-month mean of 3.4 ft and mean wave period was above the same-month mean of 5.1 seconds.

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

Typical Significant Wave Height

3.5ft
Mean: 3.8 ft
P10–P90: 1.5 — 6.4 ft
Recorded extremes

0.6 — 9.6 ft

Mean Observed Wave Period

5.5secs
P10–P90: 3.6 — 7.7secs
Recorded extremes

2.1 — 9.6secs

Available for 718 of 719 hourly samples

Typical Observed Wind

W, 15.4mph
Mean: 15.1 mph
P10–P90: 5.6 — 23.3 mph
Recorded extremes

0 — 31.3 mph

Circular concentration: 48%

Available for 517 of 719 hourly samples

Mean Water Temperature

14.6°C
P10–P90: 14.4 — 14.8°C
Recorded extremes

14.1 — 15.7°C

Compared With Previous Septembers

Historical baseline from 4,137 observations across 6 years.

Wave Height
3.8ft
0.4ft above mean
Historical mean 3.445ft
Wave Period
5.5s
0.4s above mean
Historical mean 5.1s
Water Temperature
14.6°C
0.2°C above mean
Historical mean 14.4°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 2017Last observation shown
Metric
Mean significant wave height (ft)12QC rejected323234564555432253654226453
Mean maximum wave height (ft)1311434346696888643274876228685
Mean peak period (s)447655545555555554466767856766
Mean zero-crossing period (s)335444444454544443354555645555
Mean peak wave directionNconcentration 34%Sconcentration 67%Sconcentration 99%Sconcentration 99%Sconcentration 80%SWconcentration 70%SSWconcentration 89%WSWconcentration 89%WNWconcentration 94%WSWconcentration 64%WNWconcentration 77%WSWconcentration 64%WNWconcentration 76%NWconcentration 96%NNWconcentration 94%Nconcentration 98%NNEconcentration 97%Nconcentration 90%Variableconcentration 26%Sconcentration 99%SSEconcentration 38%Sconcentration 99%Sconcentration 100%Sconcentration 99%Sconcentration 96%Sconcentration 91%Sconcentration 99%Sconcentration 100%Sconcentration 100%Sconcentration 98%
Mean wave directionNconcentration 44%Sconcentration 74%SSEconcentration 99%SSEconcentration 98%SSWconcentration 84%SWconcentration 97%SSWconcentration 98%SWconcentration 94%WNWconcentration 91%WSWconcentration 66%Wconcentration 78%WSWconcentration 66%Wconcentration 81%NWconcentration 95%NNWconcentration 97%Nconcentration 99%NNEconcentration 98%Nconcentration 94%Variableconcentration 24%Sconcentration 100%Variableconcentration 23%Sconcentration 99%Sconcentration 100%SSEconcentration 99%SSEconcentration 99%Sconcentration 99%SSEconcentration 99%Sconcentration 100%Sconcentration 100%Sconcentration 100%
Mean directional spread (°)30.632.020.023.328.233.031.530.728.129.126.729.132.424.724.222.727.233.230.421.929.721.321.824.422.628.221.419.619.221.3
Mean wind directionNWconcentration 76%SSWconcentration 77%SSEconcentration 100%Sconcentration 97%WSWconcentration 82%WSWconcentration 93%SWconcentration 95%Wconcentration 95%WNWconcentration 93%WSWconcentration 86%Wconcentration 95%WSWconcentration 77%Wconcentration 93%NWconcentration 98%NWconcentration 98%Nconcentration 93%NNEconcentration 90%NWconcentration 93%SSWconcentration 66%SSWconcentration 71%NNWconcentration 89%Nconcentration 100%--------
Mean wind speed (mph)7132111101313151920231920212117131111198---------
Mean water temperature(°C)15.215.114.614.414.514.614.714.714.714.714.614.714.514.414.414.414.414.414.414.514.514.614.714.814.814.714.714.714.614.5

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.

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