This is the 1738th most frequent Russian word.
грозит
"Грозит" means "threatens" or "is threatening."
In this context, 'грозит' conveys the idea of a danger or risky outcome that potentially awaits.
Если он продолжит опаздывать, ему грозит увольнение.
If he continues to be late, he risks being fired.
Here, 'грозит' is used to indicate an impending or threatening event related to weather.
Погода неспокойная, грозит шторм.
The weather is unsettled, a storm is looming.
In this case, 'грозит' expresses the sense of an action causing a possible negative consequence.