At one spot in the Washington area, it got so cold this week that it set a record. At the same spot in the same week, it got warm enough Friday to match a record. It “was kinda spooky,” tweeted Taylor Jackson, who watched the fog roll in from the Anacostia near Nationals Park. Science has its explanations: warm air laden with moisture, streaming over icy rivers, is a recipe for condensation and fog. Only five days earlier, the low of minus-1 degree set a record there for the date for cold.

Source: Washington Post January 13, 2018 02:32 UTC