انْقَشَعَتِ السُّحُبُ فَظَهَرَ الْقَمَرُ.
The clouds cleared, and the moon appeared.
تَنْقَشِعُ السُّحُبُ، فَيَظْهَرُ الْقَمَرُ.
The clouds are clearing, and the moon comes into view.
The past forms report completed events. The present forms may depict an unfolding scene or a recurring sequence, depending on context. One rhetorical effect is vivid presentation, not an automatic claim of habitual action.
The surrounding verbs, time markers, and speaker’s purpose determine the intended temporal reading.