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Days with Marine Heat Waves
Total number of days per year on which each grid cell was under MHW conditions. Select a year below to display the map.
MHW days per year
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Total days with Marine Heat Waves
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Number of MHW Events Detected
Count of discrete MHW events per year at each location — a measure of how frequently the basin is affected by separate heat wave episodes.
MHW events per year
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Total MHW events detected
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Maximum MHW Category Attained
The highest intensity category (1–4) reached at each grid point during the year, following the Hobday et al. (2018) classification scheme.
Category 1 · Moderate
Anomaly between 1× and 2× the local threshold
Category 2 · Strong
Anomaly between 2× and 3× the local threshold
Category 3 · Severe
Anomaly between 3× and 4× the local threshold
Category 4 · Extreme
Anomaly exceeding 4× the local threshold
Maximum MHW category per year
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Maximum Marine Heat Wave category attained