Of course if you are going ot on a more extended trip, such as a week or more, you need to be prepared (with both skills and gear) to cope with a major storm, particularly if you're at high altitude. Weather forecasting isn't much good that far out, especially in the mountains which often make their own weather.
Obviously. I over prep in any case, but even when I was 20 I could not pry loose enough free days to be out for a week. These days I am lucky to get two nights in a row. Someday I hope to do an awesome four nights!