7 inches of snow last year completely shut Nashville down. They'd
probably have to call in the reserves if we had another inch. 15 inches
would just kill us.
BTW: They closed school one day last winter because snow was PREDICTED.
Of course, it didn't snow and the kids had a free day

When I was a boy (Gawd, I feel old LoL)
it had to be a major blizzard for schools to be canceled. Now, for
whatever reason, they are canceled at the mere mention of 4 or 5 inches.
Whether superintendents or bus drivers don't want to be sued in case of
an accident, someone is making that call. So 'snow days' are used up by
the first of March and kids have to go to school til the middle of, or
3rd week of June.