NOAA Coral Reef Watch Satellite Bleaching Alert System (SBA)

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 05 Mar 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
Caribbean
Nicaragua	↑ Watch

Pacific Ocean
Eastern Pacific
Costa Rica Pacific	↑ Warning
Isla del Coco, Costa Rica	↑ Warning
Galapagos, Ecuador	↑ Alert Level 1
Polynesia
Marquesas Islands	↑ Watch
Pitcairn Islands	↑ Alert Level 1
Melanesia
Solomon Islands	↓ Watch
Western New Caledonia	↑ Alert Level 1

Southeast Asia
Coral Triangle
Solomon Islands	↓ Watch

Australia
Other Australia Stations
Pulu Keeling, Australia	↓ Watch
Northern Territory	↑ Alert Level 2
Beagle Gulf	↑ Alert Level 2

Indian Ocean
Western Indian Ocean
Kenya	↑ Watch
Bassas da India, France	↓ Watch
Southwestern Madagascar	↑ Alert Level 2
Inhambane, Mozambique	↓ Watch
Southern Mauritius	↑ Alert Level 2

All Station Alert Levels

Google Earth KMZ

5-km Satellite Regional Virtual Station Bleaching Alert Details

Based on data from 05 Mar 2025



Nicaragua	↑ Watch
Satellite Observations: (description)
Degree Heating Week	0.0°C-weeks
Coral Bleaching HotSpot	0.1°C
Sea Surface Temperature (SST)	28.4°C
SST Anomaly	1.7°C
Maximum Monthly Mean SST Climatology	28.4°C
Most Recent Alert Level Changes:
03/05/2025	Watch
01/12/2025	No Stress
12/01/2024	Watch
05/26/2024	Alert Level 2
05/12/2024	Alert Level 1
Map and Gauge
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Costa Rica Pacific	↑ Warning
Satellite Observations: (description)
Degree Heating Week	0.1°C-weeks
Coral Bleaching HotSpot	0.9°C
Sea Surface Temperature (SST)	30.1°C
SST Anomaly	1.0°C
Maximum Monthly Mean SST Climatology	28.8°C
Most Recent Alert Level Changes:
03/05/2025	Warning
01/15/2025	Watch
12/29/2024	No Stress
12/22/2024	Watch
11/06/2024	No Stress
Map and Gauge
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Isla del Coco, Costa Rica	↑ Warning
Satellite Observations: (description)
Degree Heating Week	0.1°C-weeks
Coral Bleaching HotSpot	1.0°C
Sea Surface Temperature (SST)	30.0°C
SST Anomaly	1.2°C
Maximum Monthly Mean SST Climatology	29.0°C
Most Recent Alert Level Changes:
03/05/2025	Warning
02/26/2025	Watch
02/23/2025	No Stress
02/12/2025	Watch
08/04/2024	No Stress
Map and Gauge
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Galapagos, Ecuador	↑ Alert Level 1
Satellite Observations: (description)
Degree Heating Week	4.7°C-weeks
Coral Bleaching HotSpot	1.9°C
Sea Surface Temperature (SST)	27.7°C
SST Anomaly	2.2°C
Maximum Monthly Mean SST Climatology	26.3°C
Most Recent Alert Level Changes:
03/05/2025	Alert Level 1
02/12/2025	Warning
02/05/2025	Watch
01/29/2025	No Stress
01/19/2025	Watch
Map and Gauge
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Marquesas Islands	↑ Watch
Satellite Observations: (description)
Degree Heating Week	0.0°C-weeks
Coral Bleaching HotSpot	0.1°C
Sea Surface Temperature (SST)	28.9°C
SST Anomaly	0.3°C
Maximum Monthly Mean SST Climatology	28.8°C
Most Recent Alert Level Changes:
03/05/2025	Watch
06/30/2024	No Stress
05/08/2024	Watch
04/03/2024	Warning
12/24/2023	Watch
Map and Gauge
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Pitcairn Islands	↑ Alert Level 1
Satellite Observations: (description)
Degree Heating Week	4.0°C-weeks
Coral Bleaching HotSpot	1.1°C
Sea Surface Temperature (SST)	28.1°C
SST Anomaly	1.2°C
Maximum Monthly Mean SST Climatology	26.8°C
Most Recent Alert Level Changes:
03/05/2025	Alert Level 1
02/26/2025	Warning
02/23/2025	Watch
01/29/2025	Warning
01/08/2025	Watch
Map and Gauge
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Solomon Islands	↓ Watch
Satellite Observations: (description)
Degree Heating Week	14.2°C-weeks
Coral Bleaching HotSpot	0.8°C
Sea Surface Temperature (SST)	30.6°C
SST Anomaly	1.2°C
Maximum Monthly Mean SST Climatology	29.5°C
Most Recent Alert Level Changes:
03/05/2025	Watch
01/12/2025	Alert Level 2
12/22/2024	Alert Level 1
11/24/2024	Warning
09/18/2024	Watch
Map and Gauge
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Western New Caledonia	↑ Alert Level 1
Satellite Observations: (description)
Degree Heating Week	4.6°C-weeks
Coral Bleaching HotSpot	1.2°C
Sea Surface Temperature (SST)	28.1°C
SST Anomaly	1.5°C
Maximum Monthly Mean SST Climatology	27.2°C
Most Recent Alert Level Changes:
03/05/2025	Alert Level 1
02/26/2025	Watch
02/19/2025	Alert Level 1
02/16/2025	Warning
02/09/2025	Watch
Map and Gauge
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Solomon Islands	↓ Watch
Satellite Observations: (description)
Degree Heating Week	14.2°C-weeks
Coral Bleaching HotSpot	0.8°C
Sea Surface Temperature (SST)	30.6°C
SST Anomaly	1.2°C
Maximum Monthly Mean SST Climatology	29.5°C
Most Recent Alert Level Changes:
03/05/2025	Watch
01/12/2025	Alert Level 2
12/22/2024	Alert Level 1
11/24/2024	Warning
09/18/2024	Watch
Map and Gauge
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Pulu Keeling, Australia	↓ Watch
Satellite Observations: (description)
Degree Heating Week	1.9°C-weeks
Coral Bleaching HotSpot	0.6°C
Sea Surface Temperature (SST)	29.0°C
SST Anomaly	0.8°C
Maximum Monthly Mean SST Climatology	28.4°C
Most Recent Alert Level Changes:
03/05/2025	Watch
02/26/2025	Warning
02/09/2025	Watch
01/15/2025	Warning
12/01/2024	Watch
Map and Gauge
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Northern Territory	↑ Alert Level 2
Satellite Observations: (description)
Degree Heating Week	8.3°C-weeks
Coral Bleaching HotSpot	1.2°C
Sea Surface Temperature (SST)	31.6°C
SST Anomaly	1.9°C
Maximum Monthly Mean SST Climatology	30.1°C
Most Recent Alert Level Changes:
03/05/2025	Alert Level 2
03/02/2025	Alert Level 1
02/09/2025	Watch
01/29/2025	Alert Level 2
01/08/2025	Alert Level 1
Map and Gauge
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Beagle Gulf	↑ Alert Level 2
Satellite Observations: (description)
Degree Heating Week	8.1°C-weeks
Coral Bleaching HotSpot	1.8°C
Sea Surface Temperature (SST)	32.4°C
SST Anomaly	1.9°C
Maximum Monthly Mean SST Climatology	30.3°C
Most Recent Alert Level Changes:
03/05/2025	Alert Level 2
03/02/2025	Alert Level 1
02/09/2025	Watch
01/01/2025	Alert Level 2
12/01/2024	Alert Level 1
Map and Gauge
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Kenya	↑ Watch
Satellite Observations: (description)
Degree Heating Week	0.0°C-weeks
Coral Bleaching HotSpot	0.2°C
Sea Surface Temperature (SST)	28.9°C
SST Anomaly	0.9°C
Maximum Monthly Mean SST Climatology	28.8°C
Most Recent Alert Level Changes:
03/05/2025	Watch
01/05/2025	No Stress
12/22/2024	Watch
12/15/2024	No Stress
11/10/2024	Watch
Map and Gauge
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Bassas da India, France	↓ Watch
Satellite Observations: (description)
Degree Heating Week	9.9°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	28.6°C
Most Recent Alert Level Changes:
03/05/2025	Watch
02/19/2025	Alert Level 2
02/09/2025	Alert Level 1
02/02/2025	Watch
01/12/2025	Alert Level 1
Map and Gauge
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Southwestern Madagascar	↑ Alert Level 2
Satellite Observations: (description)
Degree Heating Week	15.4°C-weeks
Coral Bleaching HotSpot	1.0°C
Sea Surface Temperature (SST)	28.7°C
SST Anomaly	1.0°C
Maximum Monthly Mean SST Climatology	29.0°C
Most Recent Alert Level Changes:
03/05/2025	Alert Level 2
03/02/2025	Watch
01/19/2025	Alert Level 2
01/08/2025	Alert Level 1
12/15/2024	Warning
Map and Gauge
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Inhambane, Mozambique	↓ Watch
Satellite Observations: (description)
Degree Heating Week	16.3°C-weeks
Coral Bleaching HotSpot	0.8°C
Sea Surface Temperature (SST)	28.3°C
SST Anomaly	0.8°C
Maximum Monthly Mean SST Climatology	28.0°C
Most Recent Alert Level Changes:
03/05/2025	Watch
01/19/2025	Alert Level 2
01/05/2025	Alert Level 1
12/15/2024	Warning
11/27/2024	Watch
Map and Gauge
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Southern Mauritius	↑ Alert Level 2
Satellite Observations: (description)
Degree Heating Week	8.6°C-weeks
Coral Bleaching HotSpot	1.5°C
Sea Surface Temperature (SST)	29.7°C
SST Anomaly	1.6°C
Maximum Monthly Mean SST Climatology	27.7°C
Most Recent Alert Level Changes:
03/05/2025	Alert Level 2
02/16/2025	Alert Level 1
01/29/2025	Warning
01/01/2025	Watch
05/19/2024	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.

Disclaimer

06-Mar-2025

Caribbean

Eastern Pacific

Polynesia

Melanesia

Coral Triangle

Other Australia Stations

Western Indian Ocean