Not to beat a dead horse but the phrase snow showers is defined as:
"Snow falling at varying intensities for brief periods of time. Some accumulation is possible."
At least in my neck of the woods, an 8 hour event depositing 4-8" is not brief and exceeds "some". But as mentioned, 4-8" of flurries, snow showers or blizzard is still 4-8". But alas, I remain amused by the terminology chosen is this case.