donnern
to thunder
To make a loud, deep, rumbling sound, like the thunder that occurs during a storm.
Es blitzte und donnerte die ganze Nacht.
There was lightning and thunder all night.

to thunder
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to thunder
To make a loud, deep, rumbling sound, like the thunder that occurs during a storm.
Es blitzte und donnerte die ganze Nacht.
There was lightning and thunder all night.

The verb 'donnern' (to thunder) is closely related to the noun 'der Donner' (thunder). It is an onomatopoeic word, meaning the sound of the word imitates the noise it describes.
Bei dem Gewitter war der Donner extrem laut.
During the storm, the thunder was extremely loud.
The subject of the sentence tells you the meaning. If the subject is 'es' (it), it is about the weather. If it is an object like 'Wellen' (waves) or 'LKW' (truck), it is about loud movement. If it is a person, it is about loud speaking.
Gestern Abend hat es stark gedonnert.
Yesterday evening it thundered heavily.
When 'donnern' (to thunder) describes the weather, it is always used with the impersonal pronoun 'es' (it) as the subject. The verb then stands in position 2 in the main clause.
Schau mal, wie dunkel der Himmel ist, es wird gleich donnern.
Look how dark the sky is; it will thunder any moment.
In the meaning 'to move loudly', 'donnern' (to thunder) is often combined with prepositions that indicate a direction or place. Typical ones are 'gegen' (against), 'an' (against/at), 'über' (over/across), or 'durch' (through).
Die Wellen donnerten gegen die Felsen am Ufer.
The waves thundered against the rocks on the shore.
to scream
'schreien' and 'donnern' can both describe very loud speaking. 'schreien' is more general: someone speaks or calls out very loudly, for example out of fear, anger, pain, or because the surroundings are loud. 'donnern' fits more when the voice sounds deep, harsh, and often angry or commanding. Learners may confuse the words because both are loud. A practical tip: people 'schreien' loudly in many situations; a person is more likely to 'donnern' when their voice feels like a strong, harsh command.

Der Trainer donnert eine Anweisung über den ganzen Sportplatz.
The coach thunders an instruction across the entire sports field.
Das Kind schreit, weil es sich am Knie verletzt hat.
The child is screaming because it hurt its knee.