Front end vibrates when going over 50-55mph

What is your question?

I drove my 2007 Saturn Ion on sunday with no problems than we had a blizzard here in the Boston area I shoveled out my car from the snow yesterday and did not use it until this morning on the highway and to my surprise my car stared to vibrate/shake at 50-55mph. What happened or could of happened? I wont be able to get it to a mechanic until this friday...Help!!