Local weather conditions are ideal for the formation of ice dams, which lead to water damage inside your home.
Take: Lots of snow/ice on the roof. Add: melting and re-freezing. You’ll get large amounts of frozen ice and snow clogging the edges of the roof. When the snow above melts, or worse, it rains, the liquid water has nowhere to go. As it collects on the roof it backs up under the shingles, finds a hole or tear in the roofing material and comes into the house.
To prevent it pull down the snow before it softens and refreezes or break up the ice (careful not to damage the roof and gutters).