A Halloween Chill followed by a freeze

TUCSON – Heads up trick-or-treaters, this Halloween will bring a spooky chill to the area and temperatures will quickly fall into the 50s as soon as 8 PM tonight.
Much cooler air has filtered into the region after yesterday’s cold front and a Freeze Warning – the first of the season – has been issued for the coolest sections of SE Arizona. So expect freezing to briefly sub-freezing temperatures in the areas shaded in purple.And here's the seasons first Freeze Warning for