Sudden stratospheric warming

A sudden stratospheric warming (SSW) is an event in which the polar stratospheric temperature rises by several tens of kelvins (up to increases of about 50 °C (90 °F)) over the course of a few days. The warming is preceded by a slowing then reversal of the westerly winds in the stratospheric polar vortex. SSWs occur about 6 times per decade in the northern hemisphere, and only about once every 20-30 years in the southern hemisphere (and two SSWs have been observed so far ).

Sudden stratospheric warming

A sudden stratospheric warming (SSW) is an event in which the polar stratospheric temperature rises by several tens of kelvins (up to increases of about 50 °C (90 °F)) over the course of a few days. The warming is preceded by a slowing then reversal of the westerly winds in the stratospheric polar vortex. SSWs occur about 6 times per decade in the northern hemisphere, and only about once every 20-30 years in the southern hemisphere (and two SSWs have been observed so far ).