Marine Heatwave Tracker
Hobday Categories 1–5 — sustained warm SST anomalies driving coral bleaching and fisheries shifts.
Compiled daily
—
current peak
—
tracked regions
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above climatology
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Niño 3.4
NOAA MHW
Tracked region heatwave map
Cat 1 moderate → Cat 5 beyond extreme (Hobday et al.)
Current MHW category distribution
Regional spotlight
Curated