The ALADIN-France Limited-Area Model

Joël Stein

Marc Tardy

Hervé Bénichou

model (spectral) orography

The domain extends from (57°N,20°W) to (33°N,18°E)

mesh-size : Dx=Dy=9.5 km

spectral truncation : E159x159

ALADIN-France

ALADIN-Francevertical resolution

__ ALADIN__ ECMWF

0.1

1

10

100

1000

Pressure (hPa)

1 11 21 31 41 51 61

41 hydrid levels

Operational ALADIN-France configuration

• New : 3DVAR assimilation, since 25 July 2005• Semi-implicit, semi-lagrangian dynamics• Full physical package:- ISBA soil scheme- First order closure turbulence scheme- FMR15 radiation scheme- Bougeault mass-flux convection scheme- Orographic GWD + envelope orography- Adjustment to the saturation

Operational ALADIN-France configuration

P54 P48 P42 P36

Guess Forecast

3DVAR analyses and forecasts every 6 hours

ALADIN-France 3DVAR

data assimilated :• same observations as for ARPEGE

(radiosoundings, AMDAR, surface data, AMSU-A and B, HIRS radiances, SATOB winds,..) but no QUICKSCAT

• SEVIRI radiances of Meteosat 8

• T2m and Hu 2m (from TEMPs and SYNOPs)

Observations used in ALADIN-France

Surface data AMSU-A data

radio-sounding data AMSU-B data

Observations used in ALADIN-France

Observations used in ALADIN-France

air-borned data SEVIRI data

06/09/2005: red alarm in the south of France

Nîmes radar 24 h cumul Surface station 24 h cumul

06/09/2005: red alarm in the south of France

ARPEGE forecast ECMWF forecast

24 hours accumulated rain

06/09/2005: red alarm in the south of France

ARPEGE forecast ALADIN forecast

24 hours accumulated rain