National Network of Regional Coastal Monitoring Programmes

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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.

Second Severn Crossing

Tide Levels and Harmonics

Wave Spectra for 21/01/2026 11:30 GMT

Wave Spectra page developed in conjunction with Fugro GB Limited.

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(i) stands for Iridium

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Sea and Swell Summary for (21/01/2026 11:30 GMT)
Significant Wave Height (m)	0.14
Wave zero up crossing period (Spectrum Tz) (s)	2.5
Wind Wave Significant Wave Height (m)	0.13
Wind Wave Peak Period (s)	7.1
Wind Wave Peak Period Direction (°)	0
Swell Significant Wave Height (m)	0.07
Swell Peak Period (s)	31.9
Swell Peak Period Direction (°)	0
% Swell	22.3

Wave Spectra for date 21/01/2026 11:30:

Frequency (Hz)	Period (s)	Normalised Energy	Energy
0.0313	31.9	1	0.008
0.0391	25.6	0.877	0.007
0.0469	21.3	0.642	0.005
0.0547	18.3	0.489	0.004
0.0625	16	0.376	0.003
0.0703	14.2	0.265	0.002
0.0781	12.8	0.225	0.002
0.0859	11.6	0.259	0.002
0.0938	10.7	0.272	0.002
0.1016	9.8	0.268	0.002
0.1094	9.1	0.277	0.002
0.1172	8.5	0.308	0.003
0.1250	8	0.306	0.003
0.1328	7.5	0.299	0.002
0.1406	7.1	0.345	0.003
0.1484	6.7	0.329	0.003
0.1563	6.4	0.269	0.002
0.1641	6.1	0.289	0.002
0.1719	5.8	0.279	0.002
0.1797	5.6	0.215	0.002
0.1875	5.3	0.186	0.002
0.1953	5.1	0.157	0.001
0.2031	4.9	0.182	0.002
0.2109	4.7	0.226	0.002
0.2188	4.6	0.203	0.002
0.2266	4.4	0.196	0.002
0.2344	4.3	0.25	0.002
0.2422	4.1	0.239	0.002
0.2500	4	0.221	0.002
0.2578	3.9	0.233	0.002
0.2656	3.8	0.207	0.002
0.2734	3.7	0.198	0.002
0.2813	3.6	0.206	0.002
0.2891	3.5	0.246	0.002
0.2969	3.4	0.249	0.002
0.3047	3.3	0.232	0.002
0.3125	3.2	0.223	0.002
0.3203	3.1	0.183	0.002
0.3281	3	0.174	0.001
0.3359	3	0.205	0.002
0.3438	2.9	0.201	0.002
0.3516	2.8	0.186	0.002
0.3594	2.8	0.199	0.002
0.3672	2.7	0.177	0.001
0.3750	2.7	0.142	0.001
0.3828	2.6	0.131	0.001
0.3906	2.6	0.142	0.001
0.3984	2.5	0.187	0.002
0.4063	2.5	0.208	0.002
0.4141	2.4	0.201	0.002
0.4219	2.4	0.197	0.002
0.4297	2.3	0.176	0.001
0.4375	2.3	0.164	0.001
0.4453	2.2	0.159	0.001
0.4531	2.2	0.152	0.001
0.4609	2.2	0.135	0.001
0.4688	2.1	0.112	0.001
0.4766	2.1	0.109	0.001
0.4844	2.1	0.13	0.001
0.4922	2	0.133	0.001
0.5000	2	0.123	0.001
0.5078	2	0.111	0.001
0.5156	1.9	0.119	0.001
0.5234	1.9	0.129	0.001
0.5313	1.9	0.115	0.001
0.5391	1.9	0.114	0.001
0.5469	1.8	0.12	0.001
0.5547	1.8	0.113	0.001
0.5625	1.8	0.112	0.001
0.5703	1.8	0.112	0.001
0.5781	1.7	0.09	0.001
0.5859	1.7	0.084	0.001
0.5938	1.7	0.1	0.001
0.6016	1.7	0.121	0.001
0.6094	1.6	0.123	0.001
0.6172	1.6	0.108	0.001
0.6250	1.6	0.094	0.001
0.6328	1.6	0.098	0.001
0.6406	1.6	0.116	0.001
0.6484	1.5	0.126	0.001
0.6563	1.5	0.105	0.001
0.6641	1.5	0.086	0.001
0.6719	1.5	0.082	0.001
0.6797	1.5	0.075	0.001
0.6875	1.5	0.077	0.001
0.6953	1.4	0.075	0.001
0.7031	1.4	0.067	0.001
0.7109	1.4	0.064	0.001
0.7188	1.4	0.068	0.001
0.7266	1.4	0.081	0.001
0.7344	1.4	0.08	0.001
0.7422	1.3	0.076	0.001
0.7500	1.3	0.094	0.001
0.7578	1.3	0.089	0.001
0.7656	1.3	0.073	0.001
0.7734	1.3	0.084	0.001
0.7813	1.3	0.08	0.001
0.7891	1.3	0.067	0.001
0.7969	1.3	0.062	0.001
0.8047	1.2	0.053	0
0.8125	1.2	0.067	0.001
0.8203	1.2	0.076	0.001
0.8281	1.2	0.073	0.001
0.8359	1.2	0.084	0.001
0.8438	1.2	0.091	0.001
0.8516	1.2	0.082	0.001
0.8594	1.2	0.073	0.001
0.8672	1.2	0.061	0.001
0.8750	1.1	0.06	0.001
0.8828	1.1	0.064	0.001
0.8906	1.1	0.056	0
0.8984	1.1	0.05	0
0.9063	1.1	0.045	0

National Network of Regional Coastal Monitoring Programmes

Second Severn Crossing

Wave Spectra for 21/01/2026 11:30 GMTWave Spectra page developed in conjunction with Fugro GB Limited.

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Wave Spectra for 21/01/2026 11:30 GMT

Wave Spectra page developed in conjunction with Fugro GB Limited.

We would appreciate your feedback on the Website and Map Viewer