Topic: GOES-17 (West) Geostationary Lightning Mapper Test

Date/Time Issued: October 7, 2021 16:50 UTC

Product(s) or Data Impacted: GOES-17 GLM

Date/Time of Initial Impact: October 13, 2021 17:00 UTC

Date/Time of Expected End: October 14, 2021 17:00 UTC

Length of Outage: One 24 hour degraded product period. See Details below.

Details/Specifics of Change: Starting on Thursday October 13 at 17:00 UTC, GOES-17 GLM will perform testing to improve the data product. The degradation period is listed below:

• October 13 17:00 UTC to October 14 17:00 UTC: 24 hour GLM degraded radiometric data

This testing will be postponed in the event of a critical weather day. Events will slip one business day, remaining at the same time of day, until they do not conflict with critical weather day.