I don't necessarily use apps that forecast for resorts. I use NWS and the NERFC snow pages to get some info and then reference it with the TK forecast. I also use the nearest town forecast from accuweather or weather underground to get an idea for lower elevation totals and then compare that to the resort forecast. From all of that I usually am able to make a pretty good call. I will say that NWS is definitely the most accurate.