ANALYSIS OF LOW-LEVEL JETS ASSOCIATED WITH IOP 2B CASE

The different methods of the numerical analysis of the small-scale features observed during MAP IOP cases are compared. The products from the MAP ECMWF Re-analysis are compared with the other analysis products. The properties of downscaling of MAP ECMWF Re-analysis to the meso-beta resolution are examined. The "blending initialisation method" developed under the ALADIN Project is applied as the initialisation technique. MAP IOP2 case has declared as the most intensive and complex event during MAP IOP period. The strong south flow intrusion into the Rhone valley on 20 September 1999 at 00 UTC has been measured by Lyon radiosonde. The tests describe how the analysis of low-level jet has been improved by the "blending initialisation method".