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    • NOAA Coral Reef Watch Daily Global 5-km Satellite Monitoring Marine Heatwave Watch

    Metadata Updated: July 29, 2025

    Marine heatwaves are modelled off their terrestrial namesakes and are prolonged periods of anomalously high sea surface temperature (SST). In effect, they are categorized SST anomalies. They are also a more general version of the Coral Reef Watch (CRW) daily global 5km coral bleaching "HotSpot" product. Rather than being aimed specifically at corals, however, they provide a more generalized description of marine heat stress that is likely applicable to a broader range of marine life. This daily global 5km-resolution Marine Heatwave Watch (MHW) product is derived by applying the marine heatwave algorithm of Hobday et al. (2018) to the daily global 5km "CoralTemp" SST data product. CoralTemp is one of the best and most internally consistent daily global 5km SST products available, which allowed for the creation of an accurate climatology. This enabled the derivation of an accurate, consistent MHW product (comprised of near real-time and historic components), stretching back over three decades. Provides the most recent 3 years of data only; for the full time series, see PacIOOS ERDDAP instead.

    Access & Use Information

    License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Date February 21, 2025
    Metadata Created Date July 26, 2024
    Metadata Updated Date July 29, 2025
    Reference Date(s) November 19, 2019 (creation), November 19, 2019 (issued), July 18, 2024 (revision)
    Frequency Of Update

    Metadata Source

    Harvested from ioos

    Other Data Resources

    Graphic Preview

    Sample image.

    Additional Metadata

    Resource Type Dataset
    Metadata Date February 21, 2025
    Metadata Created Date July 26, 2024
    Metadata Updated Date July 29, 2025
    Reference Date(s) November 19, 2019 (creation), November 19, 2019 (issued), July 18, 2024 (revision)
    Responsible Party NOAA Coral Reef Watch (CRW) (Point of Contact)
    Contact Email
    Guid mhw_5km
    Access Constraints
    Bbox East Long 179.97501
    Bbox North Lat 89.975
    Bbox South Lat -89.975
    Bbox West Long -179.97501
    Coupled Resource [{"title": [], "href": ["#DataIdentification"], "uuid": []}, {"title": [], "href": ["#DataIdentification"], "uuid": []}, {"title": [], "href": ["#DataIdentification"], "uuid": []}, {"title": [], "href": ["#DataIdentification"], "uuid": []}]
    Frequency Of Update
    Graphic Preview Description Sample image.
    Graphic Preview File http://pacioos.org/metadata/browse/mhw_5km.png
    Harvest Object Id 3c4c057c-fd51-415c-a2d7-50ee3bb10a4d
    Harvest Source Id 54e15a6e-6dde-4c9c-a8f0-345cc0dfccfb
    Harvest Source Title ioos
    Licence
    Lineage 2021-09-22T12:00:00Z Initial version released: v1.0. 2021-09-22T12:00:00Z Version 1.0.1 released. Fixed minor compatibility issue loading data into GIS applications by altering dimension names and coordinate variable names. 2023-01-05T19:26:00Z Data obtained from NOAA Coral Reef Watch and re-distributed via THREDDS Data Server (TDS) at PacIOOS to provide temporal aggregation and distribution through NetCDF/OPeNDAP utilities like ncWMS and ERDDAP. 2024-01-12T22:35:00Z Due to ongoing difficulty serving the entire time series aggregation through TDS, we are now limiting access to the latest 3 years. For the full time series, see PacIOOS ERDDAP instead. 2024-03-20T21:18:00Z Full time series aggregation now restored in TDS; no longer limited to latest data. 2024-04-04T07:21:00Z Due to ongoing difficulty serving the entire time series aggregation through TDS, we are now limiting access to the latest 3 years. For the full time series, see PacIOOS ERDDAP instead. 2024-07-18T19:00:00Z Due to changes in data format from CRW, time series aggregation is no longer possible with files before July 1, 2024.
    Metadata Language eng
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-179.97501, -89.975], [179.97501, -89.975], [179.97501, 89.975], [-179.97501, 89.975], [-179.97501, -89.975]]]}
    Progress
    Spatial Data Service Type THREDDS OPeNDAP
    Spatial Reference System
    Spatial Harvester True
    Temporal Extent Begin 2024-07-01T12:00:00Z
    Temporal Extent End 2025-02-19T12:00:00Z

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