vorüber
over
Describes that something has passed in time, ended, or been completed.
Der Sturm ist endlich vorüber und die Sonne scheint wieder.
The storm is finally over, and the sun is shining again.

over / past
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over
Describes that something has passed in time, ended, or been completed.
Der Sturm ist endlich vorüber und die Sonne scheint wieder.
The storm is finally over, and the sun is shining again.

'Vorüber' (over/past) is very often the prefix of separable verbs such as 'vorübergehen' (to pass by / to be over) or 'vorüberfahren' (to drive past). In main clauses, the prefix stands at the end of the sentence; in subordinate clauses and in the infinitive, it remains attached to the verb.
Ein Gewitter zieht gerade vorüber.
A thunderstorm is passing by right now.
In the temporal meaning, 'vorüber' (over) is almost always used with the verb 'sein' (to be). The structure is: [something] ist / war vorüber ([something] is / was over).
Die schlimmste Zeit ist jetzt vorüber.
The worst time is now over.
In the spatial meaning, 'vorüber' (past) is often combined with the preposition 'an' + dative. This expresses which place or person someone goes or drives past.
Er ist an mir vorübergegangen, ohne mich zu grüßen.
He walked past me without greeting me.
over / past
'vorbei' and 'vorüber' can be very similar. Both can say that something is over, and both can describe movement past a place. 'vorbei' is very common in everyday language and sounds natural in many situations. 'vorüber' often sounds a bit more elevated or written, especially when it is about time. With movement, you often encounter 'vorüber' in verbs like 'vorübergehen' (to go past) or 'vorüberfahren' (to drive past). Learners may confuse the words because they often mean almost the same thing. In everyday language, 'vorbei' is usually the safe choice; 'vorüber' fits well when the sentence sounds a little more formal or narrative.

Als der Krankenwagen vorüberfuhr, blieben die Leute kurz stehen.
When the ambulance drove past, people stopped for a moment.
Die Prüfung ist vorbei, und alle Schüler sind erleichtert.
The exam is over, and all the students are relieved.