In case you're unaware, whiteout conditions occur on Rainier throughout the year:
http://www.king5.com/topstories/stories/NW_061008WAB_rainier_fatality_KS.1bf2e9be.html
For that reason, navigation skills are essential. Check out this link for bearings to/from Camp Muir via Paradise:
http://www.nps.gov/mora/planyourvisit/upload/getyourbearings.pdf