Blizz sorcs are really limited in what they can do. If you need to take on few weak monsters it can work. All the above advice is good, but aimed at working for a few isolated cases like these I believe. This isn't really a viable way to kill more then the occasional sporadic boss in the ancient tunnels or maybe wave 2 in baal runs.
But there is nothing you can do to allow you to run in the open, except teleport around them. If you want to be able to kill everything in the game, you'll need a different char (like blizzballer or meteorb).