Meanings of heavy peal in English

Here another long and heavy peal, like thunder, began to be heard.

A heavy peal of thunder followed very quickly.

There had, for a little while past, been a low growling and muttering, which all at once broke into a heavy peal of thunder.

From these threatening masses, seamed at intervals with pale lightning, there now burst a heavy peal of thunder that shook the ground under our feet.

In their march, across the level prairie of this high table-land, they encountered a squall of rain, with vivid lightning and heavy peals of thunder.