National Network of Regional Coastal Monitoring Programmes

« Dychwelid at fap am donau, llanw a gorsafoedd tywydd eraill.

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

  

Live water level data (OD) Data (GMT) (updated every 5 seconds)

This one-second stream of data to the website is experimental and is being developed in conjunction with Fugro GB Limited

Data Ton Ddiweddaraf

Data Ton Ddiweddaraf
Amser (ASG)21-05-2025 10:30
Lledred-
Hydred-
Uchder ton (m)0.09
Uchder uchaf ton (m)0.13
Tbrig (s)-
Tz (s)2
Cyfeiriad mwyaf cyffredin (gradd)-
Ymlediad (gradd)-
Tymheredd y môr (°C)-
Energy Period (s)-
Wave Power (kW/m)-

Data llanw diweddaraf

Data Llanw Diweddaraf
Amser (ASG)21-05-2025 11:10
Codiad8.4
Gweddill0.06
Penllanw nesaf13:22, 10.34
Distyll nesaf19:22, 3.50
Highest Date27-04-2025
Highest Value15.33m
Lowest Date31-03-2025
Lowest Value0.03m