This is a super program. There are suggestions for changes I’ll make now and then but its incredibly usable the way it is. Thanks for the diligence.
After making my suggestion about changing the tray icon shape during an alert I wish I had thought about it more. Just getting enough room to display the temperature in Windows is a feat in and of itself. So you need all the real estate you can get. I’ll just nix that post and start a new one.
At this point you let the user choose one static background color. It might be easy enough to allow a second choice of background colors when in alert mode. Then the user would have control over what color it might be in either mode.