Many thanks to SWLing Post contributor, Ralf Bender, who notes:

Hello Thomas,

For all interested, extensive technical work is in progress at the DWD Pinneberg weather radio transmitter. Affected are NAVTEX, facsimile, rtty and voice transmissions.

Complete shutdown:
16.08.2021 00:00 by 21.08.2021 24:00 UTC. Other scheduled shutdowns will occur during the day on the following dates:
23.08.2021 05:00-17:00 UTC
24.08.2021 05:00-17:00 UTC
25.08.2021 05:00-17:00 UTC
30.08.2021 05:00-17:00 UTC
31.08.2021 05:00-17:00 UTC
—
73 Ralf
—
DL0103SWL
DO5RBB

Thank you for sharing this, Ralf and apologies for not getting this posted earlier. Yours was one of the emails lost in my SPAM box.