Jakubiak, Bogumil (Institute of Meteorology and Water Managemen, Warszawa, POLAND)
During the period 7-9 July 1996 an interesting meteorological situation over Europe was observed. The wavelike disturbance originated in Mediteranean region developed to the good marked low over Alps. Growing, this low moved to the North, bringing the daily precipitation amount at selected synoptic stations in Poland comparable to monthly totals.
In the paper the impact of the large scale rainfall and convective processes parametrization schemes on the quality of the precipitation forecast is investigated. Special attention will be given to the estimation in which degree a penetrative mass flux convective parameterization scheme used in global and synoptic scale runs of the model is suitable for mesoscale applications. We will try to understand the different ways in which the atmosphere respond to heating on different scales, considering the relative role of rotational stability (described by the Rossby radius of deformation) and the vertical stability.
Also such questions as the relationship of the frontogenesis, both at the surface and in the free atmosphere to the position of the heavy rainfall area and the role of the conditional symmetric instability (CSI) in concentration of the heavy rain in a fairly narrow band will be considered.