Wretched winter weather has been afflicting large areas of the northern half of the U.S. One response to extreme snow has been to coin portmanteau words for these storms. So far I’ve seen:
snowtastrophe, snowpocalypse, snowmageddon
(Hat tip to Elizabeth Daingerfield Zwicky, who recently returned to California after a holiday in the Northeast — upstate New York, New York City, Boston — with her husband and daughter, escaping just before the weather turned really ugly.)
There’s a pattern to these inventions: snow replaces the first syllable of a multi-syllable word (referring to a dire event) which has its primary accent after the first syllable (so that this word is easily identifiable). So the sources are
snow + (ca)tástrophe, (a)pócalypse, (Ar)magéddon
(and snow has a secondary accent).