00 UTC 06 UTC 12 UTC

coverage

24 h update

06 h update

Courtesy of Magnus Lindskog

TESO- B estimated with LAM Ens DA with fixed LBCsTESN- B estimated with LAM Ens DA with perturbed LBCsTES1- B estimated by downscaling ECMWF DA Ens.TES8- NMC B

Harris & Kelly (2001) (left) vs VarBC (right)Harris & Kelly (2001) (left) vs VarBC (right)

Impact of VARBC vs off-line scheme (red positive impact)

Model top 5hPa: until ch 11-12Model top 10 hPa: until ch 10In case of problem coming fro the surface, try to avoid the use of ch 5-6.

Try to avoid the use of ch 5, in case you find negative impact ...

Aircraft T biasAircraft T bias

One case: NOT FAIR, butOne case: NOT FAIR, butwe can see larger warm bias in case of aircraft increments we can see larger warm bias in case of aircraft increments

compared to that of radiosonde compared to that of radiosonde