Yep, ice storms are lots of fun./w3tcompact/icons/frown.gif Fortunately, we don't have them too often in them middle of Texas, but about every 5 to 10 years we get a lulu; freezing rain instead of snow. About 20 years ago, in the middle of one, the next door neighbor called and woke me up between 2 and 3 a.m., said he got up to go to the bathroom and found he had a roof leak in the bathroom; water dripping in the floor, and wanted to borrow my ladder to have a look in the attic to see what was going on. Without turning on a light, and barefoot just in my pajamas, and half laughing at what he'd said, I started for the garage to open the door for him to get the ladder, and when I walked through the kitchen, I walked right under water pouring in from the recessed florescent light fixture./w3tcompact/icons/shocked.gif That'll sure wake you up.
That's when we learned about "ice dams". It turned out that we didn't have roof damage. It was just that the ice formed on the roof, froze real good at the eaves, but then the heat rising inside the house melted the lower layer higher up on the roof, water ran down to the eaves, then backed up under the shingles.