National Network of Regional Coastal Monitoring Programmes

Note that these are real-time data and are not quality-controlled. Long-range graphs are plotted from a randomised subsample of half-hourly data.

St Mary's Sound

Select month:

Select File:

(i) stands for Iridium

View Chart Data

Download Spectra

Sea and Swell Summary for (30/11/2024 23:00(i) GMT)
Significant Wave Height (m)	2.08
Wave zero up crossing period (Spectrum Tz) (s)	4.9
Wind Wave Significant Wave Height (m)	2.05
Wind Wave Peak Period (s)	6.5
Wind Wave Peak Period Direction (°)	176
Swell Significant Wave Height (m)	0.33
Swell Peak Period (s)	10.5
Swell Peak Period Direction (°)	239.5
% Swell	2.5

Wave Spectra for date 30/11/2024 23:00(i):

Frequency (Hz)	Period (s)	Normalised Energy	Energy
0.035	28.6	0.001	0.004
0.055	18.2	0.006	0.019
0.075	13.3	0.052	0.16
0.095	10.5	0.099	0.305
0.105	9.5	0.185	0.571
0.115	8.7	0.21	0.649
0.125	8	0.21	0.649
0.135	7.4	0.5	1.545
0.14	7.1	0.7	2.162
0.145	6.9	0.846	2.611
0.15	6.7	0.959	2.96
0.155	6.5	1	3.087
0.16	6.3	0.939	2.899
0.165	6.1	0.882	2.722
0.17	5.9	0.882	2.722
0.175	5.7	0.762	2.351
0.185	5.4	0.5	1.545
0.195	5.1	0.35	1.079
0.205	4.9	0.342	1.057
0.215	4.7	0.35	1.079
0.235	4.3	0.173	0.535
0.255	3.9	0.177	0.547
0.275	3.6	0.092	0.286
0.295	3.4	0.068	0.209
0.315	3.2	0.074	0.229
0.395	2.5	0.019	0.059
0.475	2.1	0.014	0.044