Polar vortex

• Triple polar vortex to plunge central and eastern U.S. into Arctic cold through mid-December - The first cold snap is happening this week.
• Weather Words: Sudden Stratospheric Warming - A Sudden Stratospheric Warming Event describes the rapid warming and disruption of the stratospheric polar vortex above the Arctic.
• Think it’s cold now? Just wait for this week’s Arctic blast that’s poised to break records - It’s cold now, but the next punch of Arctic air will take it to another level.