<SNIP> However, people have had luck getting WeatherCat to run on Sierra after they adjusted Sierra's energy saver settings.
Bob2k2 explained what he is using in the following thread:
http://athena.trixology.com/index.php?topic=2209.15"I unchecked both "Put Hard Disks To Sleep When Possible" And "Prevent Computer From Sleeping...." and the crashes seem to have gone away."I'm set up slightly different (but then I'm using WeatherLink IP):
System Preferences, Energy Saver tab: Turn display off "Never," Check the box "Prevent the computer from sleeping automatically when the display is off," Uncheck the box "Put hard disks to sleep when possible," Check the next three boxes.
Under the System Preferences, Desktop & Screen Saver tab, I have a "Hot Corner" set up to "Put Display to Sleep" so I'm not running the display continuously.
Nothing in the Development section of the forum from Stu which should preclude most folks from considering macOS Sierra other than the expected USB to serial problems. Of course, that's a biggie, if it doesn't work on your particular set-up, WeatherCat's down unless you wind the clock back. And at this point, the trigger hasn't been found yet...works for some, not for others.