Mar 5, 2021 · Polar vortex expert Amy Butler and Arctic expert James Overland offer perspectives on the February cold snap in the southern U.S., the polar vortex, and how the Arctic might influence mid-latitude weather.

Feb 2, 2021 · Every single state in the US – including Hawaii – will reach below freezing temperatures on Monday morning. Check how cold your low will be Monday. This includes 86% of the country and 235 million...

Sep 17, 2024 · We have demonstrated using observational analysis and model perturbation experiments that extensive Eurasian October snow cover is related to/can force a strengthened Siberian high, increased poleward heat flux and a weak stratospheric polar vortex (PV).

Dec 4, 2024 · For the GEFSv12 forecast issued on December 1, the winds at 60 degrees North (the mean location of the polar vortex) are forecast to remain stronger than normal for at least the next 2 weeks (top, thick magenta line) before slowing down to near normal strength.

Nov 8, 2021 · the probability of a relatively strong polar vortex and a relatively mild pattern across the NH including the Eastern US and Northern Europe heading into December. The best possibility of resulting in meaningful cold, especially to the Eastern US, in my opinion would be another stretched polar vortex in December as is occurring now.

Nov 29, 2021 · But for the forecast to verify some big changes are needed to the atmospheric circulation because the current pattern of a strong polar vortex and cold Arctic, if persistent, strongly favors an overall mild winter across the

Dec 19, 2024 · The strongest polar vortex years (dark purple dots) cluster in the upper left quadrant of the graph, meaning winters with westerly QBO and La Nina. The weakest polar vortex years (dark green dots) occur in easterly QBO winters.

This graphic presents the fundamental atmospheric drivers of the polar vortex. New research suggests scientists may one day be able to improve predictability of extreme weather in the mid-latitudes that result from stratospheric events which disrupt the polar vortex.

Dec 31, 2024 · Forecasts continue to point toward the Arctic polar vortex bringing chilling winds across swathes of the U.S. in the new year. The polar vortex may lead to severe weather conditions, such...

Sep 12, 2021 · A new stratospheric Polar Vortex has now emerged over the North Pole and will continue to strengthen well into the Winter of 2021/2022. It will interact with a strong easterly wind anomaly high over the tropics.