This is the 4102nd most frequent Arabic word.
رعدية
Thunderous or related to thunder.
In this sentence, 'رعدية' is used as an adjective to describe 'الأمطار' (the rains), giving the meaning of it being associated with thunder, thereby emphasizing the type of the rains.
الأمطار الرعدية كثيفة للغاية في هذا الموسم.
The thunderous rains are very heavy this season.
Here, 'رعدية' describes 'الأصوات' (the sounds), indicating that the sounds are thunder-like or caused by thunder.
سمعنا أصواتًا رعدية قادمة من الجبال.
We heard thunderous sounds coming from the mountains.
In this context, 'رعدية' is used as part of a weather report to characterize the predicted type of rains as thunderous, linking it to meteorological phenomena.