Datasets

Forecast precipitation is considered to be snow if the model atmosphere above and at the ground surface is forecast to be below 0°C. Where the ground surface lies near the 0°C level...

Mean total swell wave direction is the spectrally averaged propagation direction of the swell waves (weighted by wave height) of the part of the spectrum that is NOT windsea...

Wave height is the vertical distance between trough and crest. Wave period is the time between the passage of one wave crest and the next. The arrow direction is the direction the waves are moving towards...

These charts provide information on current Tropical Cyclone activity. Select the ...

This chart shows the potential for tropical cyclone activity at different time ranges during the ...

The ECMWF seasonal forecasts (SEAS5) are produced every month with a 51-member ensemble at ...

MUCAPE (Most Unstable Convective Available Potential Energy) is an indicator of atmospheric instability (the susceptibility of the troposphere to support free convection) and...

These charts aim to point towards areas where anomalous weather is likely to occur. ...

This chart shows 7-day mean anomalies for a range of parameters from the ECMWF Sub-seasonal ...

This chart provides a range of skill scores relating to forecasts of the evolution of the sea ...

This chart provides a range of skill scores relating to forecasts of the evolution of the sea ...

*From the 1st Jan 2023, all Nino plots are based on the use of ERA5 SST instead of NCEP ...*

*From the 1st Jan 2023, all Nino plots are based on the use of ERA5 SST instead of NCEP ...*

**Note:** In **June 2023** ECMWF implemented a **major upgrade ...**

These charts show the the wave energy flux (in kW m⁻¹) calculated as the integral, over all forecast wave frequencies and wave directions, of the product of the wave group speed and the two-dimensional energy wave spectrum...

The height of topography above mean sea level and the depth of the sea for each model grid box ...

These charts show surface pressure patterns. Areas of high pressure (anticyclones) are usually associated with settled weather...

Dew Point Temperature at 2 m above the earth’s surface gives an indication of conditions which a person will experience or feel. High dewpoint temperatures inhibit heat loss from the body by perspriation and...

Temperatures at 2 m above the earth’s surface and winds at 10 m above the earth’s surface approximate most closely to the conditions that a person would experience.

Wind speed at 200 hPa highlights the jet stream (areas of strong winds in the upper troposphere) which can help identify movement and development of depressions...

Wind speeds near the surface are roughly proportional to the distance between isobars so closely packed isobars mean strong surface winds...

Precipitation totals include all precipitation types (rain, snow etc.) (in mm of rainfall or rainfall equivalent) falling in 6 hour or 12 hour periods using colour shading...

Total accumulated rainfall charts identify areas at greater risk of significant rainfall (or rain equivalent e.g.snowfall) but give no information regarding whether this occurs over a short or prolonged time period...

This display helps with the recognition of clouds of different layers, even when they overlap. Brighter colouring represents greater cloud cover. Cloud-free areas appear white while areas of full cloud cover at all levels appear dark grey (e.g. active fronts)...

The charts show the forecast value of the vertically integrated total column water (vapour + cloud water + cloud ice but with no precipitation included) in units of kg m⁻²...