El Nino Watch
NOAA Coral Reef Watch Degree Heating Weeks for the Gulf of Thailand stations. Context only: it can raise the overall level to Watch at most.
Koh Samui watch
Uses the latest DHW of the Coral Reef Watch stations, preferring those around Samui and the Gulf of Thailand. Stale if the newest value is more than 10 days old.
| DHW | NOAA meaning | Factor level |
|---|---|---|
| below 4 °C-weeks | below Alert Level 1 | 0 Normal |
| 4 to 8 | Alert Level 1 (reef-wide bleaching risk) | 1 Watch |
| 8 or more | Alert Level 2 or higher (mortality likely) | 2 (counts as 1 in the overall level) |
Cap: 1. Not a critical factor.