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

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(i) stands for Iridium

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Sea and Swell Summary for (30/11/2024 23:30 GMT)
Significant Wave Height (m)	2.02
Wave zero up crossing period (Spectrum Tz) (s)	5
Wind Wave Significant Wave Height (m)	1.98
Wind Wave Peak Period (s)	6.7
Wind Wave Peak Period Direction (°)	173
Swell Significant Wave Height (m)	0.52
Swell Peak Period (s)	10
Swell Peak Period Direction (°)	242
% Swell	6.5

Wave Spectra for date 30/11/2024 23:30:

Frequency (Hz)	Period (s)	Normalised Energy	Energy
0.0250	40	0	0
0.0300	33.3	0	0.001
0.0350	28.6	0.001	0.004
0.0400	25	0.003	0.009
0.0450	22.2	0.003	0.01
0.0500	20	0.003	0.01
0.0550	18.2	0.007	0.02
0.0600	16.7	0.004	0.012
0.0650	15.4	0.02	0.061
0.0700	14.3	0.046	0.14
0.0750	13.3	0.054	0.163
0.0800	12.5	0.169	0.513
0.0850	11.8	0.096	0.293
0.0900	11.1	0.065	0.197
0.0950	10.5	0.103	0.313
0.1000	10	0.27	0.821
0.1100	9.1	0.171	0.521
0.1200	8.3	0.239	0.728
0.1300	7.7	0.312	0.949
0.1400	7.1	0.73	2.219
0.1500	6.7	1	3.041
0.1600	6.3	0.97	2.951
0.1700	5.9	0.919	2.793
0.1800	5.6	0.586	1.781
0.1900	5.3	0.434	1.319
0.2000	5	0.343	1.043
0.2100	4.8	0.421	1.28
0.2200	4.5	0.271	0.825
0.2300	4.3	0.144	0.439
0.2400	4.2	0.191	0.581
0.2500	4	0.171	0.521
0.2600	3.8	0.151	0.459
0.2700	3.7	0.119	0.363
0.2800	3.6	0.071	0.216
0.2900	3.4	0.095	0.29
0.3000	3.3	0.056	0.169
0.3100	3.2	0.085	0.26
0.3200	3.1	0.067	0.202
0.3300	3	0.065	0.197
0.3400	2.9	0.034	0.102
0.3500	2.9	0.042	0.126
0.3600	2.8	0.038	0.116
0.3700	2.7	0.028	0.086
0.3800	2.6	0.024	0.074
0.3900	2.6	0.023	0.069
0.4000	2.5	0.015	0.046
0.4100	2.4	0.016	0.048
0.4200	2.4	0.019	0.058
0.4300	2.3	0.018	0.054
0.4400	2.3	0.013	0.039
0.4500	2.2	0.008	0.023
0.4600	2.2	0.012	0.036
0.4700	2.1	0.013	0.038
0.4800	2.1	0.012	0.038
0.4900	2	0.006	0.017
0.5000	2	0.007	0.02
0.5100	2	0.008	0.026
0.5200	1.9	0.004	0.014
0.5300	1.9	0.005	0.017
0.5400	1.9	0.007	0.022
0.5500	1.8	0.006	0.019
0.5600	1.8	0.004	0.012
0.5700	1.8	0.004	0.012
0.5800	1.7	0.004	0.012