Due to icy conditions, take extra precautions whenever accessing your roof.
If snow and ice arrive for any length of time, be sure to check for ice damming along your gutters and roof drains as this will prevent proper drainage. If water can't drain properly, it will seek out any minor roof deficiencies and enter your house.
After strong wind storms, inspect your flat roof for membrane uplift around perimeters. Inspect shingled roofs for shingle uplift which can be seen during the actual windstorm.
Avoid shoveling snow off your roof as you could do more damage than good.
Check all gutters and downspouts to make sure water is flowing freely.
Clean out all roof drains and gutters from spring time flower blossoms.
If your roof is over 10 years old or you suspect that your roof is aging badly, inspect it from the ground during an intense wind storm. Look specifically for shingle lift -- this is an indication that the shingle adhesive strip is no longer doing its job, exposing your roof to potential leaks and shingle blow off.