The bleaching observed by marine researchers and tourist operators on reefs in the Capricorn region confirmed the AIMS/GBRMPA weather station data that show sea surface temperatures (SSTs) in this area are well above critical levels for normal coral function. SSTs in the Keppels have been hovering 2 degrees C above the average since early December, and this sustained warm period caused temperature-sensitive corals to reach bleaching thresholds as early as Christmas.