NWS Forecast Office Phoenix, AZ

The first cold strong cold weather system of the season will move through the region at the end of the week and into this weekend. There are still some uncertainties in timing and evolution of the system, but most models are leaning toward a quick-moving system that moves through mainly on Friday, while a smaller sub-set of models favor a slower-moving system that mainly moves through on Saturday. All solutions will bring much cooler air to the region and a chance for precipitation, but the quicker-moving solutions offer lower-end precipitation totals.