NWS Warns of Dangers of Deadly ‘Roofalanches’ as Atmospheric River Barrels Down on the Sierra Nevada The National Weather Service issued a warning Wednesday about the dangers of so-called “roofalanches” as an atmospheric river barrels down on the snow-covered Sierra Nevada, reports SFGate. Related:ย NOAA: Winter Storm Warning Issued For California | 2-5 FEET of Snow Above 8,000ft Today โ Thursday The likelihood of deadly roofalanches โ the sudden release of snow from rooftops โ increases when […] Avalanche AvyBrains | February 14, 2019 0 Comments