The NWS has issued the warnings as a powerful polar vortex continues to make temperatures plunge nationwide this week.

Lows across Pima County will range between 25 to 32 degrees. Tucson’s projected low is 27 degrees. Daytime highs look to reach the 50s, including Tucson at 59 degrees.

There's also was a chance for a light snow in the morning for valleys east of Tucson, the forecast said. A freeze warning is in effect Thursday and Friday for the metro area, the weather service said.

Today, expect partly to mostly cloudy skies with highs in the low 70s. Sunday will bring mostly sunny skies with a high of 72 ...

Metro Phoenix and large swaths of the desert areas of Arizona were under a freeze warning through Sunday, the National Weather Service in Phoenix warned on Friday. The weather service later issued ...

The National Weather Service issued freeze warnings on Jan. 8 for across much of Arizona, including Maricopa, Pinal, Pima and Cochise counties.

Sub-freezing temperatures return to southern Arizona overnight, but some warmer weather is on the way as we wait for another ...

A weather system that brought windy conditions to Tucson early Wednesday brought Tucson a blast of wintry weather that had been missing here most of the season. A freeze warning is in effect ...

Winter weather enjoyers can rejoice as overnight subfreezing temperatures were expected to arrive in areas across Arizona. The National Weather Service issued freeze warnings on Jan. 8 and again ...

Much of Arizona is under a freeze warning for the weekend. Here's how to protect your pipes and home during the cold weather, ...