Looking at the OKC forcast, I would say unless the airport is closed, UPS will no doubt be flying in the morning. 3 miles and light snow will not keep UPS out.

KOKC 251720Z 2518/2618 02020G30KT 4SM -RA OVC008
TEMPO 2518/2521 2SM -RASN BR OVC006
FM252100 02022G27KT 1SM -SN BLSN OVC006
FM260000 35025G33KT 3/4SM -SN BLSN OVC005
FM261000 33024G34KT 3SM -SN BR OVC009
FM261600 31022G32KT P6SM OVC015