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Top graph is SST, shown on the left axis.

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Bottom shows Degree Heating Week (DHW), 12-week running heat stress index:
"When heat stress reaches 8°C-weeks or higher, you would likely see severe, widespread bleaching and significant mortality."
DHW is >16°C-weeks! pic.twitter.com/Ivj3FtTqXv

— Leon Simons (@LeonSimons8) August 12, 2023