Definitions
Wiktionary
- n. An infrequent thunderstorm accompanied by snow, rather than rain or hail.
Examples
“As the Herald-Journal went to press, forecasters estimated 6 inches of snowfall for Spartanburg County, up to 7 inches in the Chesnee and Boiling Springs areas, and isolated incidents of 8-inch accumulation resulting from "thundersnow" - a thunderstorm that produces snow instead of rain.”
“Just ahead of the evening commute, the Weather Channel reported thundersnow, which is heavy snow accompanied by thunder, at Dulles Airport outside Washington, D.C.”
“Mixed in with the heavy snow could be thunder and lightning, a phenomenon called thundersnow, which typically produces heavy snow over a brief period.”
“When last month's "thundersnow" knocked out power in Bennett's Montgomery County neighborhood, the preindustrial hush inside his house - when even the refrigerator seemed to hold its breath - soon gave way to the two-stroke roar of engines up and down his block.”
The Washington Post: In Pepco territory, blackouts mean more home generators, more noise complaints
“Meanwhile, in the video above, you can see Jim Cantore blow a gasket, and use some rather un-TWC language, experiencing "thundersnow": "Oh, JEE-sus!”
“With today's snowstorm expected to have very unstable air aloft, "thundersnow" with snowfall rates of 4 inches/hour is possible, and there is a chance today's blizzard could rival Chicago's greatest snow storm of all time, the blizzard of January 26 - 27, 1967.”
“calls it "thundersnow" rumbles were heard in some places and tells the tale of one commuter who was”
“Blizzard of 1978 to be exact-since Neil Stuart saw "thundersnow," a weather phenomenon featuring the unusual combination of NSW) meteorologist was 10 years old, living near Boston.”
Lists
These user-created lists contain the word ‘thundersnow’.
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Fun Weather Words
A list of my favorite words relating to weather
apricity, petrichor, almacantar, nimbostratus, diamond dust, squall, updraft, mesolow, thundersnow, wind shear, haar
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Thunder
Boanerges, brontosaurus, fremitus, lower, thunderstone, thunderstroke, incus, thunderwear, thundersnow, Thor, Pērkons, thunderbird and 38 more...
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NATURAL PHENOMENA
weather and otherwise (not including winds)
sylvanshine, serein, sunshower, derecho, thundersnow, sundog, williwaw, pilot's halo

chained_bear The kind of thing that makes Lewis Black completely freak out. (around 7:30) (Caution: bad words! Not safe for work) Jan 27, 2009
ecbrenner "thundersnow: a snowstorm that includes lightning flashes. NewScientist2686" (via Erin McKean) Jan 26, 2009