Sea observations

Sea level

SMHI presents sea level measurements from 19 gauges (sea level stations). The water level is measured as a number of cm above a specified reference point. Access to long time series enables calculation of a reference level, called “annual average sea level” which takes into account the effect of land rise. The values are averaged over 10 minute periods.

Sea level

Sea surface temperature

SMHI presents the temperature near the surface from five sea buoys and a sea level gauge. The values are averaged over 10 minute periods.

Waves

The wave height is given as the distance in metres between the wave trough and the wave peak. Five buoys measure waves. A wave sensor is mounted inside the buoy which measures the wave height, direction (the angle from which the waves come) and wave period (seconds). The values are based on observations over a 30 minute period.

Currents

Currents are measured and reported from two stations, one in the Baltic Sea and one off the west coast.