NOAA Coral Reef Watch Daily 5km Satellite Bleaching Alert Email System Subscriptions
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SUBSCRIBE TO SATELLITE BLEACHING ALERTS
Regional Virtual Stations list
Recent Satellite Bleaching Alert Emails - All Stations
The NOAA Coral Reef Watch (CRW) Satellite Bleaching Alert (SBA) system is an automated
e-mail system designed to alert subscribers to heat stress conducive to coral bleaching at select
reef locations around the globe. The system automatically delivers up-to-date information on changes in the Bleaching
Alert status of the coral reef environment, as detected by CRW's
daily global 5km-resolution satellite coral bleaching heat stress monitoring products
The SBA is a convenient data delivery system that allows critical information about coral bleaching heat stress
to reach a user's e-mail account immediately, without the user having to manually check the CRW website.
The first SBA was launched in July 2005 as a companion product to the 24 original,
operational twice-weekly global 50km Virtual Stations. These original
Virtual Stations were based on CRW's heritage twice-weekly global 50km bleaching heat stress products
and were expanded to include 227 stations in 2013.
Shortly after the release of CRW's version 2 daily global 5km product suite in May 2014, a new set of
Regional Virtual Stations
was developed and released in February 2015 to take advantage of the higher spatial and temporal
resolutions of the data. In October 2016, the SBA was upgraded to provide 5km satellite observational data across the 219 Regional Virtual Stations (with 5 duplicated Stations in overlapping regions).
For more information regarding the changes, please see the Regional Virtual Stations
description page
Once subscribed to the SBA system, an automated e-mail is sent when the coral bleaching heat stress level (see table below) changes at the
Regional Virtual Station(s) to which the user subscribes. A sample SBA message (in HTML) can be viewed
here
. Recent SBA email messages issued by NOAA CRW can be viewed
here
. Messages incorporate
information found on the
daily 5km Regional Virtual Stations page
, including links to time series graphs,
regional images, and a history of previous bleaching alerts issued. Bleaching heat stress levels defined
in the table below (updated December 15, 2023 to include the new Bleaching Alert Levels 3-5)
are based on the current values of the daily global 5km
Coral Bleaching HotSpot
and
Degree Heating Week (DHW)
products.
Stress Level
Definition
Potential Bleaching and Mortality
No Stress
Bleaching Watch
Bleaching Warning
Bleaching Alert Level 1
Bleaching Alert Level 2
Bleaching Alert Level 3
Bleaching Alert Level 4
Bleaching Alert Level 5
HotSpot <= 0
0 < HotSpot < 1
1 <= HotSpot and 0 < DHW < 4
1 <= HotSpot and 4 <= DHW < 8
1 <= HotSpot and 8 <= DHW < 12
1 <= HotSpot and 12 <= DHW < 16
1 <= HotSpot and 16 <= DHW < 20
1 <= HotSpot and 20 <= DHW
No Bleaching
Risk of Possible Bleaching
Risk of Reef-Wide Bleaching
Risk of Reef-Wide Bleaching with Mortality of Heat-Sensitive Corals
Risk of Multi-Species Mortality
Risk of Severe, Multi-Species Mortality (> 50% of corals)
Risk of Near Complete Mortality (> 80% of corals)
To receive automated e-mail alerts for any or all of the Regional Virtual Stations, follow the link
"Subscribe to Satellite Bleaching Alerts" at the top of this page. Once a subscription is added to the e-mail alert system, a
user can view and alter selection(s) or unsubscribe from the e-mail list through the same portal. If at any time you would like to unsubscribe from the automated
e-mail alert system, please visit the
unsubscription page
Detailed Description of Daily 5km Regional Virtual Station Data
CRW's Daily Global 5km Product Suite
Reports of coral bleaching (including observations of no bleaching) are greatly appreciated. Bleaching observations can be reported to your regional network or to
Coral Reef Watch
Should you have any questions or feedback on the Satellite Bleaching Alert E-mail System,
please contact
coralreefwatch@noaa.gov
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