تَفَتَّحَتِ الْأَزْهَارُ وَاعْتَدَلَ الْجَوُّ.
The flowers opened, and the weather became mild.
These are distinct assertions, yet both fit a shared spring scene. The connecting feature (jāmiʿ) supports wāw, presenting related observations as parts of one setting. The second clause is not mere emphasis: blooming and moderate weather describe different predicates.
By contrast, coordination of wholly unrelated facts can suggest an artificial association. Sound waṣl respects both the independence of each judgment and the genuine semantic relation between them.