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NOAA Coral Reef Watch Satellite Bleaching Alert

5-km Satellite Regional Virtual Stations

Bleaching or no bleaching, please report to your regional network or to Coral Reef Watch!

Alert Changes Summary

Based on data from 16 Feb 2025

No Stress

Watch

Warning

Alert Level 1

Alert Level 2

(↑) or (↓) indicates an increase or decrease in the heat stress level

Alerts are for reef regions, archipelagos or jurisdictions, not for individual data grid points


Atlantic Ocean

Brazil

Maracajau, Brazil

↓ Watch


Pacific Ocean

Polynesia

Southern Cook Islands

↑ Alert Level 1

Society Archipelago

↑ Warning

Melanesia

West Papua

↓ Watch

Western New Caledonia

↑ Warning


Southeast Asia

Other Southeast Asia Stations

Malacca Strait, Malaysia

↑ Watch

Coral Triangle

West Papua

↓ Watch


Australia

Great Barrier Reef

Far Northern GBR

↓ Watch

Central GBR

↑ Alert Level 1

Other Australia Stations

Houtman Abrolhos

↑ Alert Level 2

Lord Howe Island, Australia

↓ Watch


Indian Ocean

Western Indian Ocean

Southern Mauritius

↑ Alert Level 1

Northeastern Madagascar

↑ Alert Level 2

All Station Alert Levels   |   Google Earth KMZ

5-km Satellite Regional Virtual Station Bleaching Alert Details

Based on data from 16 Feb 2025


Maracajau, Brazil

↓ Watch

Satellite Observations: (description)

Degree Heating Week

1.8°C-weeks

Coral Bleaching HotSpot

0.6°C

Sea Surface Temperature (SST)

28.8°C

SST Anomaly

0.7°C

Maximum Monthly Mean SST Climatology

28.2°C

Most Recent Alert Level Changes:

02/16/2025

Watch

01/26/2025

Warning

12/01/2024

Watch

07/10/2024

No Stress

07/03/2024

Watch

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Southern Cook Islands

↑ Alert Level 1

Satellite Observations: (description)

Degree Heating Week

4.1°C-weeks

Coral Bleaching HotSpot

1.2°C

Sea Surface Temperature (SST)

29.4°C

SST Anomaly

1.5°C

Maximum Monthly Mean SST Climatology

27.9°C

Most Recent Alert Level Changes:

02/16/2025

Alert Level 1

01/26/2025

Warning

12/22/2024

Watch

05/19/2024

No Stress

04/28/2024

Watch

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Society Archipelago

↑ Warning

Satellite Observations: (description)

Degree Heating Week

0.1°C-weeks

Coral Bleaching HotSpot

0.9°C

Sea Surface Temperature (SST)

29.4°C

SST Anomaly

1.1°C

Maximum Monthly Mean SST Climatology

28.8°C

Most Recent Alert Level Changes:

02/16/2025

Warning

12/29/2024

Watch

05/26/2024

No Stress

05/01/2024

Watch

04/24/2024

Alert Level 1

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West Papua

↓ Watch

Satellite Observations: (description)

Degree Heating Week

8.7°C-weeks

Coral Bleaching HotSpot

0.8°C

Sea Surface Temperature (SST)

30.0°C

SST Anomaly

1.1°C

Maximum Monthly Mean SST Climatology

29.1°C

Most Recent Alert Level Changes:

02/16/2025

Watch

01/08/2025

Alert Level 2

12/29/2024

Watch

11/06/2024

Alert Level 2

10/09/2024

Alert Level 1

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Western New Caledonia

↑ Warning

Satellite Observations: (description)

Degree Heating Week

3.8°C-weeks

Coral Bleaching HotSpot

0.7°C

Sea Surface Temperature (SST)

27.6°C

SST Anomaly

0.8°C

Maximum Monthly Mean SST Climatology

27.2°C

Most Recent Alert Level Changes:

02/16/2025

Warning

02/09/2025

Watch

01/22/2025

Warning

01/01/2025

Watch

12/15/2024

Warning

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Malacca Strait, Malaysia

↑ Watch

Satellite Observations: (description)

Degree Heating Week

0.0°C-weeks

Coral Bleaching HotSpot

0.0°C

Sea Surface Temperature (SST)

29.8°C

SST Anomaly

0.9°C

Maximum Monthly Mean SST Climatology

29.9°C

Most Recent Alert Level Changes:

02/16/2025

Watch

01/26/2025

No Stress

10/30/2024

Watch

10/23/2024

Warning

06/26/2024

Watch

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West Papua

↓ Watch

Satellite Observations: (description)

Degree Heating Week

8.7°C-weeks

Coral Bleaching HotSpot

0.8°C

Sea Surface Temperature (SST)

30.0°C

SST Anomaly

1.1°C

Maximum Monthly Mean SST Climatology

29.1°C

Most Recent Alert Level Changes:

02/16/2025

Watch

01/08/2025

Alert Level 2

12/29/2024

Watch

11/06/2024

Alert Level 2

10/09/2024

Alert Level 1

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Far Northern GBR

↓ Watch

Satellite Observations: (description)

Degree Heating Week

13.0°C-weeks

Coral Bleaching HotSpot

0.8°C

Sea Surface Temperature (SST)

29.4°C

SST Anomaly

0.8°C

Maximum Monthly Mean SST Climatology

28.8°C

Most Recent Alert Level Changes:

02/16/2025

Watch

01/19/2025

Alert Level 2

01/05/2025

Alert Level 1

12/11/2024

Warning

12/01/2024

Watch

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Central GBR

↑ Alert Level 1

Satellite Observations: (description)

Degree Heating Week

7.3°C-weeks

Coral Bleaching HotSpot

1.2°C

Sea Surface Temperature (SST)

29.6°C

SST Anomaly

1.2°C

Maximum Monthly Mean SST Climatology

28.3°C

Most Recent Alert Level Changes:

02/16/2025

Alert Level 1

02/12/2025

Watch

01/26/2025

Alert Level 1

01/15/2025

Warning

01/12/2025

Watch

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Houtman Abrolhos

↑ Alert Level 2

Satellite Observations: (description)

Degree Heating Week

8.4°C-weeks

Coral Bleaching HotSpot

1.7°C

Sea Surface Temperature (SST)

24.9°C

SST Anomaly

2.4°C

Maximum Monthly Mean SST Climatology

23.5°C

Most Recent Alert Level Changes:

02/16/2025

Alert Level 2

02/02/2025

Alert Level 1

01/19/2025

Warning

12/15/2024

Watch

06/30/2024

No Stress

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Lord Howe Island, Australia

↓ Watch

Satellite Observations: (description)

Degree Heating Week

0.9°C-weeks

Coral Bleaching HotSpot

0.7°C

Sea Surface Temperature (SST)

24.7°C

SST Anomaly

0.7°C

Maximum Monthly Mean SST Climatology

24.1°C

Most Recent Alert Level Changes:

02/16/2025

Watch

02/02/2025

Warning

12/15/2024

Watch

12/08/2024

Warning

12/04/2024

Watch

Map and Gauge
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Southern Mauritius

↑ Alert Level 1

Satellite Observations: (description)

Degree Heating Week

4.6°C-weeks

Coral Bleaching HotSpot

2.0°C

Sea Surface Temperature (SST)

29.4°C

SST Anomaly

2.0°C

Maximum Monthly Mean SST Climatology

27.7°C

Most Recent Alert Level Changes:

02/16/2025

Alert Level 1

01/29/2025

Warning

01/01/2025

Watch

05/19/2024

No Stress

04/24/2024

Watch

Map and Gauge
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Northeastern Madagascar

↑ Alert Level 2

Satellite Observations: (description)

Degree Heating Week

8.1°C-weeks

Coral Bleaching HotSpot

2.3°C

Sea Surface Temperature (SST)

30.6°C

SST Anomaly

2.3°C

Maximum Monthly Mean SST Climatology

28.2°C

Most Recent Alert Level Changes:

02/16/2025

Alert Level 2

02/02/2025

Alert Level 1

01/12/2025

Warning

11/27/2024

Watch

05/22/2024

No Stress

Map and Gauge
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Summary Notes

No Stress

No heat stress HS <= 0

Watch

Low heat stress 0 < HS < 1

Warning

Heat stress accumulating HS >= 1
0 < DHW < 4

Alert Level 1

Bleaching expected HS >= 1
4 <= DHW < 8

Alert Level 2

Significant bleaching expected; mortality likely HS >= 1
DHW >= 8
  • Bleaching alerts are only generated when there is a stress level change for a station.
  • The alerts are generated for affected reef regions, archipelagos, and/or jurisdictions, not for individual data grid points.
  • Your bleaching observations (including observations of no bleaching) are greatly
    appreciated. Observations can be sent to coralreefwatch@noaa.gov and/or entered online via Coral Reef Watch.
  • Should you have any questions or feedback on our Satellite Bleaching Alert email system, please send an email to coralreefwatch@noaa.gov.
  • To view, change (stations, email type, etc), or end your subscription, please visit the Coral Reef Watch Satellite Bleaching Alert website.
  • Please do not reply to this email address.
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17-Feb-2025