A snowstorm (in the Northeastern U.S.) in October, bringing with it the inevitable portmanteau, as in this CBS news report from two days ago:
Octsnowber? Fall snow storm threatens Northeast
A substitution portmanteau, with the substitution in the interior of the host word: /sno/ (spelled SNOW) for /o/ (spelled O). Substitutions are most commonly at the beginning or end of the word, but this one’s in the middle, involving the accented syllable.