A convection initiation case study during COPS: 6 August 2007
On 6 August 2007 a frontal system approached the COPS low-mountain region from the west. In advance of the front, convection initiated along the Vosges Mountains. The storms propagated eastward into the Rhine Valley and produced an outflow boundary that supported secondary convection initiation.
Dual-Doppler observations were obtained from the Doppler on Wheels (DOW) mobile radars. These systems provided clear-air measurements prior to convection forming in the Vosges Mountains, as well as information about the evolution of the system during its propagation across the Rhine Valley. At the eastern side of the Rhine Valley, wind profile observations were obtained at the Achern Supersite with the University of Salford's Doppler wind lidar and the University of Manchester's wind profiler. Additionally the Basilicata Raman lidar system (BASIL) obtained water vapor observations while positioned at Achern. Further information about the pre-convective environment and convective evolution will be assessed with the use of surface stations, soundings and GPS tomographic moisture retrievals. Comparisons of the observations with high-resolution WRF (Weather Research and Forecasting) simulations will be shown to highlight the necessary features for convective development on this day.