WMO Evaluation of Two Extreme High Temperatures Occurring in February 2020 for the Antarctic Peninsula Region

ABSTRACT Two reports of Antarctic region potential new record high temperature observations (18.3°C, 6 February 2020 at Esperanza station and 20.8°C, 9 a Brazilian automated permafrost monitoring on Seymour Island) were evaluated by World Meteorological Organization (WMO) panel atmospheric scientists. The latter figure was reported as 20.75°C in the media. considered synoptic situation instrumental setups. It determined that large pressure system over area created föhn conditions resulted local warming for both situations. Examination data metadata observation revealed no major concerns. However, analysis Island indicated an improvised radiation shield led to demonstrable thermal bias error sensor. Consequently, WMO has accepted 18.3°C value 1200 LST (1500 UTC 2020) Argentine “Antarctic (continental, including mainland surrounding islands) highest recorded observation” but rejected 20.8°C biased. committee strongly emphasizes not badly designed its purpose, project investigators forced improvise nonoptimal after losing original covering. Second, with regard media dissemination this type information, urges increased caution early announcements many outlets often tend sensationalize mischaracterize records.