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 21/04/2024 16:30 GMT

Wave Spectra page developed in conjunction with Fugro GB Limited.

(i) stands for Iridium

Turning point search range: (Min>5): to (Max<40):  
Sea and Swell Summary for (21/04/2024 16:30 GMT)
Significant Wave Height (m)0.1
Wave zero up crossing period (Spectrum Tz) (s)5.8
Wind Wave Significant Wave Height (m)0.04
Wind Wave Peak Period (s)5.8
Wind Wave Peak Period Direction (°)0
Swell Significant Wave Height (m)0.02
Swell Peak Period (s)25.6
Swell Peak Period Direction (°)0
% Swell13.8
Wave Spectra for date 21/04/2024 16:30:
Frequency (Hz)Period (s)Normalised EnergyEnergy
0.031331.90.580
0.039125.60.7830
0.046921.30.6320
0.054718.30.6180
0.0625160.6130
0.070314.20.5770
0.078112.80.5740
0.085911.60.5490
0.093710.70.5740
0.10169.80.6210
0.10949.10.6680
0.11728.50.7120
0.125080.7970
0.13287.50.8850
0.14067.10.9560
0.14846.70.970
0.15636.410
0.16416.110
0.17195.810
0.17975.60.9480
0.18755.30.8850
0.19535.10.8190
0.20314.90.7770
0.21094.70.7010
0.21884.60.5990
0.22664.40.5110
0.23444.30.4890
0.24224.10.470
0.250040.4560
0.25783.90.4480
0.26563.80.4420
0.27343.70.440
0.28123.60.4370
0.28913.50.4310
0.29693.40.4230
0.30473.30.4180
0.31253.20.4120
0.32033.10.3870
0.328130.360
0.335930.3540
0.34372.90.3380
0.35162.80.3190
0.35942.80.310
0.36722.70.2970
0.37502.70.3020
0.38282.60.3050
0.39062.60.2990
0.39842.50.2860
0.40632.50.2910
0.41412.40.2990
0.42192.40.2860
0.42972.30.2940
0.43752.30.2970
0.44532.20.2940
0.45312.20.3080
0.46092.20.280
0.46882.10.2720
0.47662.10.2660
0.48442.10.2640
0.492220.250
0.500020.2420
0.507820.2390
0.51561.90.2310
0.52351.90.2390
0.53121.90.2340
0.53911.90.2170
0.54691.80.2140
0.55471.80.2030
0.56251.80.2010
0.57031.80.2030
0.57811.70.2010
0.58591.70.1950
0.59381.70.1980
0.60161.70.1920
0.60941.60.1840
0.61721.60.1810
0.62501.60.1810
0.63281.60.1760
0.64061.60.1760
0.64841.50.1810
0.65631.50.1760
0.66411.50.1760
0.67191.50.1730
0.67971.50.1760
0.68751.50.1730
0.69531.40.1680
0.70311.40.1620
0.71091.40.1510
0.71881.40.1510
0.72661.40.1510
0.73441.40.140
0.74221.30.1370
0.75001.30.140
0.75781.30.1370
0.76561.30.1320
0.77351.30.1320
0.78131.30.1290
0.78911.30.1320
0.79691.30.1370
0.80471.20.1460
0.81251.20.140
0.82031.20.1460
0.82821.20.140
0.83591.20.1290
0.84371.20.1290
0.85161.20.1210
0.85941.20.1130
0.86721.20.1130
0.87501.10.1070
0.88281.10.0960
0.89061.10.0910
0.89851.10.0820
0.90631.10.0770