One thing models cant predict is minor variations. The difference between convection and no convection based on realtime info. For instance, NMM has no ppn for merseyside or irish sea till early tomorrow morning, yet on the radar there is active convection. Slight changes in temp cant be progged on 3hr models. I am optimistic there will be more than models are progging bit not too sure it will all be snow or even stick but shall see.