GOES-West Operational Interleave Round 2 began today, 10/13, at 1600 UTC, and is expected to continue through 11/16. See this blog post from Interleave Round 1 for more details and examples. To summarize what this means for NWS users: to mitigate impacts of the GOES-17 (currently operational GOES-West satellite) ABI cooling system issues during the Oct-Nov warm period, GOES-West ABI Imagery (single-band imagery, band differences, RGBs) is now from GOES-18. Other GOES-West products, such as from GLM, and ABI derived products (cloud products, TPW, DMWs, etc) remain from GOES-17.
Figures 1 and 2 capture the two hours prior to and two hours after the start of Interleave for Ch08 WV and Airmass RGB, respectively. The improvement of the imagery from GOES-17 to GOES-18, for these products, is obvious.
Bill Line, NESDIS/STAR