What severe weather conditions are affecting millions of Americans according to meteorologist Jess?

Millions of Americans are experiencing dual weather threats: extreme chilly temperatures across much of the country and a significant winter storm. This storm has particularly impacted areas from Tennessee up through Kentucky, causing extreme flooding conditions. The cold weather appears to be part of a polar vortex system extending from the Dakotas to Texas, creating hazardous conditions that have disrupted daily life with school cancellations and transportation difficulties. These severe weather patterns have broken temperature records and raised concerns about rising energy costs as communities struggle with the widespread winter weather event.