A temperature outlook from the National Weather Service and the potential for a rare November Sudden Stratospheric Warming (SSW) may combine to drive winter-like conditions across much of the U. S.” Washington Post meteorologist Ben Noll posted on X: “A major sudden stratospheric warming event, possibly the earliest on record, is now likely to occur from late November into early December. For an event to be classified as major, it requires both a dramatic temperature rise as well as a sharp deceleration in stratospheric winds. The event’s impact a disruption of the polar vortex may quickly propagate from the stratosphere into the troposphere, where weather happens, displacing Arctic air southward into Canada and the United States after Thanksgiving. This pipeline of cold will be reinforced during December as high pressure becomes anchored over Russia. “Several pulses of frigid air look likely across the United States next month, particularly in the northern half of the country. Though less certain, it seems reasonable to expect that this cold air will link up with moisture a few times, increasing chances for a snowier-than-average start to winter in some states. Stratospheric warming events are slow-moving, so don’t be surprised if it takes a little longer to ‘feel’ the impacts and if it sticks around for longer than you might expect possibly into the new year. It will be an interesting ride.” What Happens Next In most areas of the U. S., temperatures have been above average in many cases, which could make the incoming cold shift feel more severe. Forecasts will continue to be issued as the SSW develops, and people living in the impacted areas should monitor local weather guidance.
https://www.newsweek.com/map-shows-states-getting-hit-with-major-sudden-weather-phenomenon-11102101