last bulletin on ozone at Halley, Rothera and Vernadsky/Faraday stations provided by British Antarctic Survey(with my underlining) Antarctic Situation at 2020 July 27 Antarctic ozone today: The 2020 ozone hole is beginning to form. Ozone amounts are building around the continent as the polar vortex forms, and are lower within the vortex. Values range from around 220 DU within the vortex to around 430 DU outside it. Lowest values are west of the Antarcticic Peninsula. Rothera experienced its first ozone hole day on June 30. The vortex area is increasing and now covers around 29 million square kilometres (msqkm) near the base of the ozone layer, which is above average for the time of year. The temperature of the ozone layer over Antarctica is falling and is now below the -78°C Polar Stratospheric Cloud (PSC) formation threshold in most parts, giving an area with potential PSC of 27 msqkm, above the average for the time of year. The temperature is mostly close to average values and is highest around Antarctica and declines towards the equator and over the Pole. Ozone depletion is expected to increase over the coming ten days as photochemistry and planetary wave forcings play their part. The depletion 'season' is approaching. If the hole is larger than average this year(in contrast to last) you might expect that the final warming of the stratospheric vortex may be delayed...which in turn may delay the onset of the southern summer pattern.