Figure 1: (a) RAMS domains: (b) SYNOP land stations over the second domain. The colours of the stations show the reports multiplicity for spring 2013 and for the 18 hours of forecasting time and (c) SYNOP mobile stations over the second domain. The colours of the stations show the reports multiplicity for spring 2013 and for the 60 hours of forecasting time. The positions and number of the mobile reports change with time.