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WMO Region VII (Antarctica mainland & adjoining islands): Highest Temperature

WMO Region VII (Antarctica mainland & adjoining islands): Highest Temperature

Record Value 17.5°C (53.5°F)
Date of Record 24/ 3 (March) /2015
Length of Record 1953-present
Instrumentation Maximum and minimum thermometers in Stevenson Screen
Geospatial Location Esperanza Research Station (Argentina) [63°24'S, 56°59'W, elevation: 13m (42.7ft)]

References

Eos Earth and Space Science News of the American Geophysical Union (AGU) published on 1 March 2017.

Discussion

The synoptic situation for the event associated with the temperature extreme shows a Northwest-southeast – aligned 500 hPa ridge stretching from South America to the Antarctic Peninsula, in correspondence with a 500 hPa height trough extending from the Antarctic at around 120°W. Together, these features drive a strong northwesterly geostrophic flow which (i) is associated with warm advection and (ii) drives strong winds perpendicular to the mountain chain in the northern part of the Peninsula, conducive to the development of föhn at Esperanza (Fig. 3B).

WMO Region VII

WMO Region VII (Antarctica)