Planetary waves and extreme weather events

A study reports that the majority of extreme weather events that occurred from May to September in 2012 and 2013 in the Northern Hemisphere midlatitudes were accompanied by meridional oscillations in the path of the jet stream and associated winds caused by planetary waves that were highly magnified with a large number of wave crests; the atmospheric resonance conditions that can lead to highly magnified waves were often present within 1-2 weeks before the waves’ onset. - Read at PNAS.org

Article #16-06300: “Role of quasiresonant planetary wave dynamics in recent boreal spring-to-autumn extreme events,” by Vladimir Petoukhov et al.