iPhone: Circled Exclamation Point On Lock Screen?

What an excellent and yet so simple suggestion! I have indeed clicked on the "!" earlier on and was brought to a weather app (Yr). But for some weird reason I never thought that could explain something.

I immediately removed the weather app from my iPhone, then reinstalled it, went through the familiar notification procedures (for the app and its widgets), and now the "!" is gone. Instead, I have visual presention of temperature and precipitation (or lack thereof). (Normally, the name of the month is occupying that area of the lock screen.)

Hard to tell what exactly caused this beviour. Obviously, the app failed to deliver information to the lock screen. Maybe the the settings (file) had turned corrupt. Information in the app itself and in its widgets were correct.

Thanks for all hints!

Thanks, sberman, for quick reply. But, no, I don’t own an Apple Watch.

Sorry for the confusion. The date is correct. My screenshot dates back to Monday (roughly an hour after midnight in Norway). I’ve been using the shot on a couple of other occasions.