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EPS Surface Perturbed Forecast Data
Set
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This part includes a brief description and the order forms
of this specific Data Set.
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Description:
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period supported - 1 May 1994 to current date;
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each parameter is stored as a field of grid point values, in latitude rows starting at the north and working southwards; within each row values run from west to east starting at the 0° meridian;
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data are stored in FM 92 GRIB using sufficient bits to ensure that the values represented can be retrieved to an accuracy consistent with the analysis method used.
The changes to this archive are as follows:
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1 May 1994 |
Internal data representation is in a regular N48 Gaussian grid (48 lines of latitude, between the pole and the equator for each hemisphere, with a regular spacing of 1.875° between points along each latitude row) Data consists of an ensemble of 32 daily 10 day forecasts from base time 1200 UTC Forecast steps available are 0 then 12 hourly to HH+240 Fields available are snow depth, large scale precipitation, convective precipitation, snowfall, boundary layer dissipation, surface sensible heat flux, surface latent heat flux, MSL pressure, total cloud cover, u- and v-components of wind at 10m, 2 metre temperature, 2 metre dewpoint temperature, surface solar radiation, surface thermal radiation, top solar radiation, top thermal radiation, gravity wave dissipation, soil temperature level 1, soil wetness level 1 |
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10 December 1996 |
Internal data representation is in a N80 Quasi-regular Gaussian grid (80 lines with varying numbers of points along each row) The number of ensemble members increased to 50 |
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9 June 1999 |
From this date large scale precipitation, convective precipitation, snowfall, MSL pressure, total cloud cover, u- and v-components of wind at 10m, 2 metre temperature, 2 metre dewpoint temperature, maximum temperature at 2m since previous post processing, minimum temperature at 2m since previous post processing are archived for forecast steps 0 then 6 hourly to HH+240. All other fields are still archived only every 12 hours. |
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27 June 2000 |
Fields added are wind gust at 10 metres, archived every 6 hours, boundary layer height, sunshine duration Soil wetness level 1 replaced by volumetric soil wetness layer 1 |
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21 November 2000 |
Internal data representation is in an N128 Quasi-regular Gaussian grid (128 lines between the pole and the equator, with varying numbers of points along each row) |
| 25 March 2003 | Ensemble forecasts from base time 0000 UTC are available |
| 7 October 2003 | Convective available potential energy added |
| 1 February 2006 | Internal data representation is a N200 Quasi-regular Gaussian grid (200 lines between the pole and the equator, with varying numbers of points along each row). |
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16.09.2008 |
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