FASTER Project

The NWP Testbed for the FASTER Project

Model intercomparison for cloud fraction


The links on this page summarise our initial results for the model intercomparison of the following properties: cloud fraction, ice water content, and liquid water content. Our primary focus is on the skill various NWP models have in forecasting cloud, and to investigate this we use the symmetric extreme dependency skill score, SEDS.

The first set of figures display a timeseries intercomparison of the vertically-averaged value of SEDS for cloud fraction. For models with a range of forecast lead times we can also investigate how the model forecast degrades with time.

Some seasons are often much easier to forecast than others. This has been investigated by constructing seasonal composites over all available years. Composites have been created to illustrate the performance of various models at forecasting cloud fraction using SEDS, and have also been created for both observations and models for cloud fraction, ice water content and liquid water content.

For similar plots describing individual years, or for more detailed comparisons with the observations for individual models (e.g. mean, frequency of occurrence, amount when present and PDFs), click here.

Timeseries: cloud fraction skill (SEDS) intercomparison

Intercomparisons are also displayed for individual models where the different forecast lead times are available.

SGP (from 2001-2010): All available models NCEP Met Office Global
Darwin (from 2005-2009): All available models NCEP Met Office Global

Seasonal composites


SGP (taken from 2004-2009)

ECMWF: Cloud fraction skill (SEDS) Cloud fraction IWC LWC
ERA-Interim: Cloud fraction skill (SEDS) Cloud fraction IWC LWC
NCEP t+12-23: Cloud fraction skill (SEDS) Cloud fraction IWC LWC
Met Office Global t+12-23: Cloud fraction skill (SEDS) Cloud fraction IWC LWC
Meteo France: Cloud fraction skill (SEDS) Cloud fraction IWC LWC

Darwin (taken from 2005-2009)

ECMWF: Cloud fraction skill (SEDS) Cloud fraction IWC LWC
NCEP t+12-23: Cloud fraction skill (SEDS) Cloud fraction IWC LWC
Met Office Global t+12-23: Cloud fraction skill (SEDS) Cloud fraction IWC LWC
Meteo France: Cloud fraction skill (SEDS) Cloud fraction IWC LWC