How accurate is a 6-10 day weather forecast?

im going snowboarding in utah and its been just dumping snow but i dont leave until sunday and their isnt supposed to be much snow all week it says.

there is a 30% sunday and monday, 20% tuesday, 10% wednesday, 60% thursday, and 0% friday.

i obviously want it to snow but how accurate is that for being 5-10 days away.

is there still a chance of some good snow storms coming in for us or are they gonna be right?How accurate is a 6-10 day weather forecast?
It usually isnt very accurate they just put those numbers out because thats where they "think" a systems going to go. But im sure theyll be some snow.