Unknown, with various theories as below. Compare English blizz (“violent rainstorm”), dialectal English bliz (“violent blow”); one etymology, from Midlands English dialect, seems to be ultimately from Old English blysa (“blaze”).
BLIZZARD (7th S. v. 106).—The word blizzard is well known through the Midlands, and its cognates are fairly numerous. I have known the word and its kin fully thirty years. Country folk use the word to denote blazing, blasting, blinding, dazzling, or stifling. One who has had to face a severe storm of snow, hail, rain, dust, or wind, would say on reaching shelter that he has "faced a blizzer," or that the storm was "a regular blizzard." A blinding flash of lightning would call forth the exclamation, "My! that wor a blizzomer!" or "That wor a blizzer!" "Put towthry sticks on th' fire, an let's have a blizzer"—a blaze. "A good blizzom" = a good blaze. "That tree is blizzared" = blasted, withered. As an oath the word is often used, and "May I be blizzerded" will be readily understood.
BLIZZY. A blaze. "Blow the fire, and let's have a nice blizzy." This, though now considered a vulgarism, is a retention of the original A.-Sax. blysa, a blaze.
And Angelina Parker, A Glossary of Words Used in Oxfordshire (1876): [14]
Blizzy, a flaring fire produced by putting on small sticks. Ex. 'Let's 'a a bit of a blizzy afore us goes to bed.'
And from Barzillai Lowsley, A Glossary of Berkshire Words and Phrases (1888): [15]
BLIZZY.— A blaze. The fire is said to be all of a "blizzy" when pieces of wood have been inserted amongst the coal to make it burn cheerfully.
And from G. F. Northall, A Warwickshire Word-book (1896): [16]
Blizzy, sb. A blaze, a blast, a flare of fire. A.-Sax. blysa, a blaze. Common.
They suggest that blizzy survived from the ancient word blysa in numerous localities and might well share a root with the U.S. blizzard.
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blizzard (plural blizzards)
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blizzard (third-person singular simple present blizzards, present participle blizzarding, simple past and past participle blizzarded)
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blizzard m (plural blizzards)