Topic: NOAA-15 and NOAA-19 AVHRR Channel 3A / 3B Switching Activation over Alaska Region

Date/Time Issued: September 15, 2023 1448Z

Product(s) or Data Impacted: NOAA-15 and NOAA-19 AVHRR data over Alaska Region

Date/Time of Initial Impact: September 16, 2023 0336:20Z

Date/Time of Expected End: Seasonally (Ongoing)

Length of Outage: See details below; roughly 8 months

Details/Specifics of Change:  NESDIS Office of Satellite and Product Operations (OSPO) engineers will activate switching for NOAA-15 and NOAA-19 AVHRR Channel 3A / 3B for the period of September 16, 2023 to May 14, 2024.  Switching to Channel 3A will occur during this period over the predefined box encompassing the Alaska Region (box coordinates 50°N to 75°N and 173°E to 135°W).  NOAA-15 and NOAA-19 AVHRR will switch between Channel 3B and Channel 3A to support snow and ice detection and monitoring activities over Alaska Region. First NOAA-15 AVHRR 3A/B switch September 16 Rev 31824, 259/03:36:20 to 259/03:42:19 UTC for a duration of 359 seconds.  First CDA contact NOAA-15 F Rev 31825 259/05:15:40 to 259/05:23:20 UTC for a duration of 460 seconds.
First NOAA-19 AVHRR 3A/B switch and CDA contact September 16 F Rev 75280, 259/04:45:10 to 259/04:50:18 UTC for a duration of 308 seconds. Channel switching will stop after May 14, 2024 for the beginning of fire season. A reminder notification will be sent.

The coordination for the activation and deactivation of switching for NOAA-15 and NOAA-19 AVHRR Channel 3A / 3B is a collaborative effort between NESDIS OSPO, National Weather Service (NWS) Alaska Region, University of Alaska - Geographic Information Network of
Alaska (GINA), and the NWS Fire Weather Service Manager and is intended to seasonally optimize the Fire Weather and Cryosphere observing posture for Alaska.  

Contact Information for Further Information: ESPCOperations at at 301-817-3880

Web Site(s) for applicable information: See for this and other satellite related messages.

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