It came up over the weald by night with a great wind.
From the en.wikipedia.org
Deposits of ironstone which occur where sandstone strata overlie weald clay have been exploited from early in the Iron Age.
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An area of open or forested country
The Weald is the name given to a physiographic area in South East England situated between the parallel chalk escarpments of the North and the South Downs. ...
A wood or forest; a wooded land or region; also, an open country; often used in place names
Noun: Forest, wood, grove, but also bushes or foliage. Similar to German Der Wald, a forest or woodland. Also see wold and bosk.