Thanks, MikeyM! I'll look into it sometime soon, but probably not today.
I suspect it has to do with the map update times that the NWS has changed and now my script needs to 'catch up'. Nope, bad guess!
Well, that was fairly easy! The same problem with 'first Thursday' originated in this very old script. Also, the links were all 'http://" rather than "https://" so no padlock was displayed in the browser address bar.
Additionally, this script never made it into
my scripts page. The script doesn't validate at present, and I haven't the time to sort it out right now.