An archaic word used in Northern England and Scotland. Not much used since the late 1800s, but still peripherally in the public consciousness because [Emily Brontë] named her one novel [Wuthering Heights]. The narrator gives a basic definition of wuthering ("'Wuthering' being a significant provincial adjective, descriptive of the atmospheric tumult to which its station is exposed in stormy weather."), but most of us wouldn't know what wuther meant if confronted with it in an unfamiliar context.
1. verb To [blow] fiercely (said of the [wind]). To [buffet]. To blow noisily.
"All t' day a wild hurricane [wuther]'d throo t' glen,
An' then rush'd like a fiend up to t' heeath;
An' as Peggy sat knittin' shoo said tuv hersen,
"Aw dear! he'll be starruv'd to t' deeath."
-- [Yorkshire] Dialect Poems (1673-1915) and Traditional Poems, Compiled by [F. W. Moorman], 1916
2. noun Wind, especially [gusty], [blustery], and roaring wind.
"I felt sure now that I was in the pensionnat--sure by the beating rain on the casement; sure by the '[wuther]' of wind amongst trees, denoting a garden outside; sure by the chill, the whiteness, the solitude, amidst which I lay."
-- [Villette] by [Charlotte Bronte], 1853
3. adjective Hard blowing (said of wind), especially blowing loudly.
"Wee, crimson-tippet Willie Wink,
Wae's me, drear, dree, and dra,
A waeful thocht, a fearsome flea,
A [wuther] wind, and a'."
-- [What Katy Did] by [Susan Coolidge], 1872
Wuther is said to have come from the more well-known '[wither]', meaning to loose [vitality], [force], or [freshness].
Webster's Third New International Dictionary, 1981