NOAA Coral Reef Watch Satellite Bleaching Alert System (SBA)

NOAA Coral Reef Watch Satellite Bleaching Alert

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

Alert Changes Summary

Based on data from 22 Jan 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

5-km Satellite Regional Virtual Station Bleaching Alert Details

Based on data from 22 Jan 2025



Panama Atlantic East	↑ Watch
Satellite Observations: (description)
Degree Heating Week	3.4°C-weeks
Coral Bleaching HotSpot	0.0°C
Sea Surface Temperature (SST)	28.6°C
SST Anomaly	1.5°C
Maximum Monthly Mean SST Climatology	28.5°C
Most Recent Alert Level Changes:
01/22/2025	Watch
01/19/2025	No Stress
12/08/2024	Watch
11/24/2024	Alert Level 2
11/20/2024	Watch
Map and Gauge
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Easter Island, Chile	↓ No Stress
Satellite Observations: (description)
Degree Heating Week	0.0°C-weeks
Coral Bleaching HotSpot	0.0°C
Sea Surface Temperature (SST)	25.0°C
SST Anomaly	0.3°C
Maximum Monthly Mean SST Climatology	25.1°C
Most Recent Alert Level Changes:
01/22/2025	No Stress
01/08/2025	Watch
03/06/2024	No Stress
02/25/2024	Watch
02/21/2024	No Stress
Map and Gauge
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Fiji	↑ Warning
Satellite Observations: (description)
Degree Heating Week	0.5°C-weeks
Coral Bleaching HotSpot	1.4°C
Sea Surface Temperature (SST)	29.6°C
SST Anomaly	2.0°C
Maximum Monthly Mean SST Climatology	28.4°C
Most Recent Alert Level Changes:
01/22/2025	Warning
12/01/2024	Watch
06/05/2024	No Stress
05/05/2024	Watch
04/28/2024	Alert Level 2
Map and Gauge
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Western New Caledonia	↑ Warning
Satellite Observations: (description)
Degree Heating Week	2.1°C-weeks
Coral Bleaching HotSpot	0.8°C
Sea Surface Temperature (SST)	28.1°C
SST Anomaly	1.2°C
Maximum Monthly Mean SST Climatology	27.2°C
Most Recent Alert Level Changes:
01/22/2025	Warning
01/01/2025	Watch
12/15/2024	Warning
12/08/2024	Watch
04/21/2024	No Stress
Map and Gauge
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Timor-Leste	↓ Watch
Satellite Observations: (description)
Degree Heating Week	4.8°C-weeks
Coral Bleaching HotSpot	0.9°C
Sea Surface Temperature (SST)	30.8°C
SST Anomaly	1.1°C
Maximum Monthly Mean SST Climatology	29.5°C
Most Recent Alert Level Changes:
01/22/2025	Watch
01/08/2025	Alert Level 1
12/18/2024	Watch
11/24/2024	Warning
10/20/2024	Watch
Map and Gauge
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Torres Strait	↑ Alert Level 2
Satellite Observations: (description)
Degree Heating Week	8.3°C-weeks
Coral Bleaching HotSpot	1.7°C
Sea Surface Temperature (SST)	30.9°C
SST Anomaly	1.8°C
Maximum Monthly Mean SST Climatology	28.9°C
Most Recent Alert Level Changes:
01/22/2025	Alert Level 2
01/08/2025	Alert Level 1
12/11/2024	Warning
11/24/2024	Watch
05/19/2024	No Stress
Map and Gauge
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Northern Coral Sea Islands	↑ Alert Level 2
Satellite Observations: (description)
Degree Heating Week	8.4°C-weeks
Coral Bleaching HotSpot	1.8°C
Sea Surface Temperature (SST)	30.0°C
SST Anomaly	1.9°C
Maximum Monthly Mean SST Climatology	28.3°C
Most Recent Alert Level Changes:
01/22/2025	Alert Level 2
01/05/2025	Alert Level 1
12/11/2024	Warning
12/01/2024	Watch
05/01/2024	No Stress
Map and Gauge
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Norfolk Island, Australia	↑ Warning
Satellite Observations: (description)
Degree Heating Week	0.4°C-weeks
Coral Bleaching HotSpot	1.0°C
Sea Surface Temperature (SST)	24.6°C
SST Anomaly	1.3°C
Maximum Monthly Mean SST Climatology	23.5°C
Most Recent Alert Level Changes:
01/22/2025	Warning
12/11/2024	Watch
05/05/2024	No Stress
03/24/2024	Watch
02/18/2024	Alert Level 2
Map and Gauge
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Central Mozambique	↑ Warning
Satellite Observations: (description)
Degree Heating Week	0.4°C-weeks
Coral Bleaching HotSpot	1.2°C
Sea Surface Temperature (SST)	29.7°C
SST Anomaly	1.7°C
Maximum Monthly Mean SST Climatology	28.6°C
Most Recent Alert Level Changes:
01/22/2025	Warning
01/05/2025	Watch
12/29/2024	Warning
11/24/2024	Watch
05/26/2024	No Stress
Map and Gauge
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South Africa	↓ Watch
Satellite Observations: (description)
Degree Heating Week	2.5°C-weeks
Coral Bleaching HotSpot	0.4°C
Sea Surface Temperature (SST)	27.4°C
SST Anomaly	0.9°C
Maximum Monthly Mean SST Climatology	27.0°C
Most Recent Alert Level Changes:
01/22/2025	Watch
01/01/2025	Warning
12/15/2024	Watch
05/12/2024	No Stress
05/05/2024	Watch
Map and Gauge
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Southeastern Madagascar	↑ Alert Level 1
Satellite Observations: (description)
Degree Heating Week	4.8°C-weeks
Coral Bleaching HotSpot	2.4°C
Sea Surface Temperature (SST)	28.6°C
SST Anomaly	2.4°C
Maximum Monthly Mean SST Climatology	27.2°C
Most Recent Alert Level Changes:
01/22/2025	Alert Level 1
01/01/2025	Warning
12/29/2024	Watch
12/22/2024	Warning
12/15/2024	Watch
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

23-Jan-2025