This is the 2466th most frequent Catalan word.
senyal
Signal, sign, or mark.
Here, 'senyal' refers to a physical traffic sign acting as an indicator.
El senyal de trànsit indica que hem de parar.
The traffic sign indicates that we must stop.
In this context, 'senyal' represents an observable cue or sign indicating weather conditions.
Vaig veure un senyal de pluja imminent al cel.
I saw a sign of imminent rain in the sky.
Here, 'senyal' is used to describe an auditory or material signal conveying information.