This dataset shows global satellite product showing instantaneous thermal stress to coral reefs that, when accumulated, may lead to bleaching; updated daily.
The NOAA Coral Reef Watch daily 5-km Coral Bleaching HotSpot product measures the occurrence and magnitude of instantaneous thermal stress on coral reefs worldwide that could result in bleaching. The product's color scale ranges from 0 to 5 ℃. HotSpot values of 1 ℃ or more above the maximum monthly mean (MMM) temperature (or the warmest of the twelve monthly mean temperatures in the climatology) are accumulated in Coral Reef Watch's Degree Heating Week (DHW) product.
The data shown here reflects thermal stress at the moment - but it's important to keep in mind that a reef may be experiencing, and responding to, accumulated thermal stress over the past 12 weeks (as captured in the Degree Heating Weeks data product, which is also available) regardless of the additional current thermal stress being experienced at the moment.