Forecasters said Flagstaff temperatures would drop to 28 degrees on Wednesday with a low of nine degrees into Wednesday night.
"Patchy freezing drizzle will change to freezing rain early this afternoon", the agency said.
A cooler preceding air mass - which is the variable certainly missing this week - will increase the odds of more widespread wintry weather to return to the area. The warning lasts from 6 p.m. Tuesday to 6 a.m. Wednesday.More news: Trump says he'll keep US troops in Iraq to 'watch Iran'
Below is another look at radar and temperatures.valid at 6 A.M. Wednesday. "If there's any ice still, it's going to be really weakened with all the warmth that we've had".
The unseasonably warm temperatures will fall making way for freezing rain in the region.
Freezing drizzle advisories are issued when drizzle falling in sub-zero temperatures is expected to freeze on contact, and over time create icy surfaces.More news: Trump, Kim edging closer to second summit
Chatham-Kent, London, Strathroy and Middlesex County are also under a freezing rain warning. Punch one will be the icing event into Wednesday morning.
This snow is the result of a Colorado low that will track over Northeastern Ontario Monday evening. Total snowfall amounts of 10 to 15 cm are possible by the time the snow ends Monday night.More news: Gunners enter race to sign Idrissa Gueye ahead of PSG