
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.

to thunder
To move at great speed with a loud noise or to crash into something.
Die Wellen donnerten gegen die Klippen.
The waves thundered against the cliffs.

to thunder
To speak in a very loud, often angry or commanding tone.
„Ruhe jetzt!“, donnerte der Lehrer in die laute Klasse.
'Quiet now!' thundered the teacher into the noisy class.
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 roar / yell
Brüllen and donnern can both describe a very loud utterance by an angry person. Brüllen emphasizes that someone is shouting, while donnern is used more for a deep, forceful, commanding tone that does not necessarily involve shouting. Choose brüllen for loud yelling and donnern for a booming address.

Der wütende Chef donnert dem Mitarbeiter eine kurze Anweisung zu.
The angry boss thunders a brief instruction at the employee.
Der wütende Chef brüllt den Mitarbeiter vor allen Kollegen an.
The angry boss yells at the employee in front of all his colleagues.