NOAA Coral Reef Watch satellite thermal stress products: HotSpot, Degree Heating Weeks and Bleaching Alert Areas

evidence

Reef thermal stress is measured as HotSpot (sea surface temperature above the local maximum monthly mean) accumulated over a rolling twelve-week window into Degree Heating Weeks, with roughly four DHW indicating likely significant bleaching and roughly eight indicating likely widespread bleaching and mortality. V55 verification basis: the product documentation was NOT retrieved — coralreefwatch.noaa.gov was refused by the egress proxy — and these definitions and thresholds are stated from the producing model's working knowledge of the products. Any alert levels added above Level 2 are not described here.

A evidence is not a place. Drawing it on a map would assert something about the world that no stored fact supports.