On December 1, the St. Louis area got hammered with snow. Over three inches fell in a few hours, on top of the six inches already on the ground from earlier in the week. USPS told mail carriers they could stay home if they didn’t feel safe. Deanna Chatman went out anyway. “Something told me just to go,” she told KSDK. Midway through her route in a Maryland Heights subdivision, she saw an older woman waving from inside her garage doorway. Chatman…