Last 5 days
Positive SST Anomaly
Difference between the observed sea surface temperature and its climatological value for the same location and calendar day, derived from 1982–2019 CMEMS data (SST_MED_SST_L4_NRT_OBSERVATIONS_010_004). Only positive departures are shown.
Distribution of yesterday's positive anomalies
Distribution of positive anomalies — 2 days ago
Distribution of positive anomalies — 3 days ago
Distribution of positive anomalies — 4 days ago
Distribution of positive anomalies — 5 days ago
Last 5 days
Differences above the 90th Percentile
Temperatures exceeding the local 90th percentile are statistically expected on only 1 in every 10 days (based on the 1982–2019 record). These maps show the magnitude of exceedance — a prerequisite for MHW classification.
Differences above the 90th percentile — yesterday
Differences above the 90th percentile — 2 days ago
Differences above the 90th percentile — 3 days ago
Differences above the 90th percentile — 4 days ago
Differences above the 90th percentile — 5 days ago
Last 5 days
Heat Spike
The heat spike quantifies the temperature anomaly specifically in areas where the observed SST already exceeds the 90th percentile — that is, the excess warmth on top of an already extreme threshold.
Heat spike distribution — yesterday
Heat spike distribution — 2 days ago
Heat spike distribution — 3 days ago
Heat spike distribution — 4 days ago
Heat spike distribution — 5 days ago
Last 10 days
Marine Heat Wave — Mean Intensity
Mean intensity of active MHW events, defined as the average temperature excess above the climatological value accumulated over the duration of the warm event at each location.
MHW mean intensity — yesterday
MHW mean intensity — 2 days ago
MHW mean intensity — 3 days ago
MHW mean intensity — 4 days ago
MHW mean intensity — 5 days ago
MHW mean intensity — 6 days ago
MHW mean intensity — 7 days ago
MHW mean intensity — 8 days ago
MHW mean intensity — 9 days ago
MHW mean intensity — 10 days ago
Last 10 days
Marine Heat Wave — Category
Maximum MHW category reached at each location, classified following Hobday et al. (2018) in multiples of the local climatological threshold (difference between the 90th percentile and the mean).
Anomaly between 1× and 2× the local threshold
Anomaly between 2× and 3× the local threshold
Anomaly between 3× and 4× the local threshold
Anomaly exceeding 4× the local threshold
MHW maximum category — yesterday
MHW maximum category — 2 days ago
MHW maximum category — 3 days ago
MHW maximum category — 4 days ago
MHW maximum category — 5 days ago
MHW maximum category — 6 days ago
MHW maximum category — 7 days ago
MHW maximum category — 8 days ago
MHW maximum category — 9 days ago
MHW maximum category — 10 days ago
Current year
Year-to-date MHW Summary
Cumulative diagnostics for the current calendar year: total days under MHW conditions, number of discrete events, and the maximum intensity category reached at each grid point.
Number of days under marine heat wave conditions this year
Number of discrete MHW events detected this year
Maximum MHW intensity category reached this year