Ice is falling on top of snow, causing major problems at Seattle-Tacoma Airport, bringing trees down and threatening power outages in the Northwest.

Flight delays and cancelations have been occurring at the Seattle-Tacoma Airport due to freezing rain icing up runways. According to FlightStats.com, there have been more than 100 cancellations and close to one hundred delays so far on Thursday.

A new storm is slamming into the Northwest Coast, allowing milder Pacific air to rush over cold air hovering at the surface. This is setting the scene for the dangerous freezing rain.

Besides creating headaches for airline passengers, motorists face extremely slippery travel. No vehicle, including those with four wheel drive, is safe from icy roads.

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The weight of ice will be heavy enough, especially on top of record-setting snow that fell on Thursday, to down tree limbs and cut power in some communities.

A glaze of ice was covering everything early Thursday with some trees crashing down and sagging power lines near Summit, Wash.

About a quarter of an inch of ice had accumulated on surfaces in Issaquah, Wash., early Thursday. Some trees branches were snapping due to the weight of snow and ice.

Other areas that have received significant accumulations of ice with similar problems include Ballard, Puyallup, North Bend and Mirrormont, Wash.

With cold air also penetrating the interior Northwest through the Columbia River gorge, freezing rain has been causing very slippery travel across portions of northeastern Oregon and southeastern Washington. Pendleton, The Dalles and Hermiston, Ore., as well as Walla Walla and Pullman, Wash., are among the cities and towns with treacherous icy conditions.