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Significant wave height and mean direction

Base Time: Mon 24 Jan 2022 00 UTC T+24 Valid time: Tue 25 Jan 2022 00 UTC (T+24)

At any location over the oceans, a wave field is fully characterised by its 2-dimensional wave spectrum which describes how much wave energy is present for given frequencies and propagation directions. This comprehensive representation is simplified in a set of integrated parameters:
The significant wave height is defined as 4 times the square root of the integral over frequency and direction of the wave spectrum.
The mean wave direction is the spectrally averaged propagation direction of the waves.

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ECMWF Newsletter No. 170

Winter 2021/22 Newsletter published

The winter 2021/22 issue of the ECMWF Newsletter is now available. As well as news about ECMWF staff and events, it features articles about new developments and the use that can be made of ECMWF products.

21 January 2022

Sylvie Lamy-Thépaut

Widening the reach of ECMWF’s data

ECMWF is on a mission to make its data available to more people. Sylvie Lamy-Thépaut combines weather forecasting expertise with computing knowledge to achieve this.

17 January 2022

ECMWF at AMS Annual Meeting 2022

ECMWF at the AMS Annual Meeting 2022

An overview of ECMWF presentations at the 102nd Annual Meeting of the American Meteorological Society (AMS), taking place virtually from 22 to 27 January 2022 under the theme 'Environmental Security: weather, water and climate for a more secure world'.

21 January 2022

Forecast charts and data

We provide current forecasts, climate reanalyses and specific datasets. These are available via the web, point-to-point dissemination, data servers and broadcasting.

Upgrade to IFS Cycle 47r3

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12 October 2021

Today's #IFS47r3 upgrade includes major changes to the forecast model and improved use of observations to further increase the forecast quality. Read more: Forecast upgrade improves moist physics and use of satellite observations #newfcsystem





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