Although ice dams are not a common problem in Las Vegas, where the climate is generally dry and hot, they can form in the rare instance that winter temperatures drop low enough for it to freeze. The dams themselves are not a result of the exterior conditions; rather, they happen when a house is too warm, causing snow on the roof to melt. Ice dams are formed when the heat from a house causes the snow on the roof to melt...
One frequently used process for getting rid of ice dams is to use steam to melt the ice. This is done in such a manner that there is little risk of damaging the roof, and it is gentler by far than just about any alternative. Professionals are trained to handle the equipment that produces the steam and to direct the steam in such a way that your roof is well-preserved. They have a considerable safety margin built in, too, because the process is so much safer and healthier for not only the roof but also the environment. There may be some instances when this method is inappropriate, but most of the time, when you're faced with an icy situation, steaming is a good bet.
In addition to steam removal, there are some ice dam removal methods and prevention measures to consider for Las Vegas. Heat cables can be installed along the roof's edge to ensure an even roof temperature that keeps the roof above freezing. Homeowners also have the option of applying a chemical treatment to the roof that lowers water's freezing point. Local roofing experts will be able to assess your situation and recommend the best course of action for your home. If an ice dam is present, they can recommend the best methods for removal. If having an ice dam is not your idea of long-term home ownership, they can also help identify the best long-term methods for preventing the formation of ice dams on your roof.