Explainer: How ice dams form, cause leaking, flooding in homes after heavy snowfall, snow, winter storm. Experts say the best way to prevent ice dams is to keep a consistent temperature on the roof by reducing heat loss from inside the home. Sealing air leaks to prevent warm air from escaping into the attic.

A major winter storm is pummeling the Tri-State Area with snow and ice after New York and New Jersey declared states of emergency.

Roof systems that are maintained and evaluated ahead of time tend to perform more reliably when temperatures shift

So what are the prospects for travellers as the storm approaches? Rail passengers are waking up on Thursday morning to a barrage of warnings – including line closures taking place during the afternoon.

Storm Goretti hits the UK with strong winds and snow, leaving thousands without power Hundreds of thousands without power as Storm Goretti pummels Europe. Forecasters in France and Britain issued weather warnings,