Jet Stream Shift Traps Unusual Hot and Cold Air Across U.S.

• The jet stream's unusual northern position is trapping warm air up north and cold air down south

• Global warming is causing higher overall temperatures, though not directly attributable to the jet stream shift

• The El Niño weather pattern is also pushing the jet stream farther north

• East Coast and Southern cities will see unusually high temps this week

• Multiple factors explain the current stretch of weird winter weather