The malfunction occurred in an FAA facility in Salt Lake City around 5 a. m. EST, when a card inside a router that processes flight plans and weather information started to fail.

盐湖城的一处FAA设施在美东时间上午5时左右发生故障，当时处理航班计划和天气信息的一台路由器内部的卡片开始出现故障。

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New York, Atlanta and Salt Lake City are poster cities for a phenomenon common to cities in industrialized nations: They create their own weather.

CNN: In-Depth Specials - City Limits

Snow cover amplifies the phenomena called a temperature inversion Salt Lake City was a foggy freezer box Wednesday at 18 degrees, while Park City basked in sunny 43-degree weather.

NPR: Sickening Fog Settles Over Salt Lake City Area