The StormTrack First Alert continues Tuesday night and Wednesday.
Expect very cold air overnight with lows around 18 degrees - coldest of the year - in fact.
The warm up begins Thursday as temps climb to the low 50s and overnight lows warm to the upper 20s and low 30s. We should get close to 60 by late weekend.
By the way, Phoenix has had four consecutive days of sub-32 degrees each morning. This is the longest stretch since December 1978. They expect another freeze overnight.