Mean sea level pressure | 2-meter temperature | 24-hour precipitation |
3-hourly 10-meter wind gust | Temperature at 850 hPa | Relative humidity at 700 hPa |
Geopotential at 500 hPa | Wind field at 250 hPa | Wind field at 100 hPa |
Impact of initial condition
Experiments for storm Desmond are initialized from ERA-Interim and ERA5 re-analysis datasets on T255L91 resolution for 4 December 2015. The major events related to the storm (high precipitation, wind gusts) happened on 5 December. So the 24–48 hours forecast lead times are shown here.
First, we can make an inter-comparison between the initial conditions provided by ERA-Interim and ERA5 on the native ERA-Interim resolution (T255L91, approximately 80 km grid distance and 91 vertical levels). The figures are available in PNG format for 7 variables: soil temperature on level 2, surface pressure, model orography and temperature, specific humidity, wind field, cloud cover on model levels. The PNG documents are structured in 2 left panels for the outputs of the forecasts initialized from ERA-Interim and ERA5, while the difference between the two fields is displayed in the right panel.
Click on the PNG documents to open them and to see the individual pictures.
Soil temperature on level 2 | Surface pressure | Model orography | |
Temperature at model level 91 | Specific humidity at model level 91 | Wind field at model level 91 | Cloud cover at model level 91 |
The PDF documents below are prepared to check the forecast results for 9 variables from the T255L91 run initialized on 4 December 2013: mean sea level pressure, 2-meter temperature, 24-hour precipitation, 3-hourly 10-meter wind gust, 850 hPa temperature, 700 hPa relative humidity, 500 hPa geopotential, 250 hPa and 100 hPa wind fields. The figures of experiments are organized in 2 columns according to the 2 initial conditions and 9 rows for the 3-hourly forecast outputs between 00 UTC on 5 and 00 UTC on 6 December. The only exception is the precipitation where the daily amounts are located in one row. Both the corresponding ERA-Interim and ERA5 fields are displayed as reference (please note that the ERA-Interim re-analyses are available with 6-hour frequency).
Click on the PDF documents to open them and to see the individual pictures (note that most documents have 2 pages).
Mean sea level pressure | 2-meter temperature | 24-hour precipitation | 3-hourly 10-meter wind gust |
|
Temperature at 850 hPa | Relative humidity at 700 hPa | Geopotential at 500 hPa | Wind field at 250 hPa | Wind field at 100 hPa |
Impact of horizontal resolution
Experiments for storm Desmond are conducted on 3 resolutions: T255L91, T639L137 and T1279L137 (approximately 80, 32, 16 km grid distance with 91, 137 and 137 vertical levels, respectively). The forecasts are initialized from ERA-Interim on 4 December 2015 and the major events related to the storm (high precipitation, wind gusts) happened on 5 December. So the 24–48 hours forecast lead times are studied.
The PDF documents below are prepared for 9 variables: mean sea level pressure, 2-meter temperature, 24-hour precipitation, 3-hourly 10-meter wind gust, 850 hPa temperature, 700 hPa relative humidity, 500 hPa geopotential, 250 hPa and 100 hPa wind fields. The figures of experiments are organized in 3 columns according to the 3 resolutions and 9 rows for the 3-hourly forecast outputs between 00 UTC on 5 and 00 UTC on 6 December. The only exception is the precipitation where the daily amounts are located in one row. Both the corresponding ERA-Interim and ERA5 fields are displayed as reference (please note that the ERA-Interim re-analyses are available with 6-hour frequency).
Click on the PDF documents to open them and to see the individual pictures (note that most documents have 2 pages).
Mean sea level pressure | 2-meter temperature | 24-hour precipitation | 3-hourly 10-meter wind gust | |
Temperature at 850 hPa | Relative humidity at 700 hPa | Geopotential at 500 hPa | Wind field at 250 hPa | Wind field at 100 hPa |