Dangerous avalanche conditions, rainy and gusty in the lowlands Avalanche danger in Cascades An Avalanche Warning is in effect for the Cascades until 6pm today due to heavy snow, strong winds, and warming temperatures. seattle - An atmospheric river is bringing rain in the lowlands and mountain snow. An Avalanche Warning is in effect for the Cascades until 6pm today due to heavy snow, strong winds, and warming temperatures. Expect very dangerous avalanche conditions, even for low elevations which includes Stevens and Snoqualmie Passes. Try to avoid travel in avalanche terrain. Snow levels wi...