The chance for a major sudden stratospheric warming (SSW) event (🔴) looks lower than it did 2 months ago—

The multi-model ensemble signal is still indicative of a weaker polar vortex during early winter, which can enable Arctic air intrusions in the USA.

🧵 on winter weather! pic.twitter.com/5QifauV9QV

— Ben Noll (@BenNollWeather) November 14, 2021