From Newsweek:
Meteorologists are raising alarms as Florida braces for an unusual polar vortex that could bring icy temperatures as far south as Miami. So far, this winter has seen one of the warmest Decembers on record in much of the northern United States. Though many residents experienced snow around the holidays, snow coverage was still at or near 20-year lows.
However, the polar vortex could bring severe weather conditions, with some forecast models suggesting lobes of the system’s frigid airs could push far into the southern United States, including Florida, with the potential to disrupt daily life in a state unaccustomed to such cold extremes.