P3.1 J. Calbó: Cloud fraction retrieved from ceilometer and camera observations: a comparison

P3.2 J. Calbó: Sensitivity of several ground based cloud and aerosol observation techniques

P3.3 M. Blašković: Benefits of super rapid scan satellite data usage for utilization of satellite-based indicators of storm severity

P3.4 J. Lorente: Fair weather atmospheric electric field in a coastal, urban site