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.

Happisburgh

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(i) stands for Iridium

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Sea and Swell Summary for (16/05/2026 10:30(i) GMT)
Significant Wave Height (m)	0.93
Wave zero up crossing period (Spectrum Tz) (s)	5.3
Wind Wave Significant Wave Height (m)	0.84
Wind Wave Peak Period (s)	9.5
Wind Wave Peak Period Direction (°)	45
Swell Significant Wave Height (m)	0.4
Swell Peak Period (s)	11.1
Swell Peak Period Direction (°)	43.6
% Swell	18.3

Wave Spectra for date 16/05/2026 10:30(i):

Frequency (Hz)	Period (s)	Normalised Energy	Energy
0.03	33.3	0.001	0.001
0.04	25	0.006	0.004
0.05	20	0.011	0.007
0.06	16.7	0.03	0.02
0.07	14.3	0.073	0.048
0.075	13.3	0.342	0.224
0.08	12.5	0.357	0.234
0.085	11.8	0.794	0.52
0.09	11.1	1	0.655
0.095	10.5	0.335	0.22
0.1	10	0.45	0.295
0.105	9.5	0.58	0.38
0.11	9.1	0.511	0.335
0.12	8.3	0.335	0.22
0.13	7.7	0.432	0.283
0.14	7.1	0.511	0.335
0.15	6.7	0.5	0.328
0.17	5.9	0.26	0.17
0.19	5.3	0.254	0.167
0.21	4.8	0.308	0.202
0.23	4.3	0.181	0.119
0.25	4	0.105	0.069
0.27	3.7	0.089	0.058
0.29	3.4	0.058	0.038
0.31	3.2	0.073	0.048
0.39	2.6	0.027	0.018
0.47	2.1	0.012	0.008