Use the NOAA site
link and make your decisions about routes based on the forecast.
Last week you would have been better off using I-40 this week either I-10/20 or I-40 will work.
The link has a lot of information but I find the Graphical maps the most useful. You can click ahead by 12 hour increments and then see the weather, precip, wind, etc. by going to the left hand columns and moving through the time blocks.
As a generality using I-10 or I-20 is best in winter, but watch the forecast even in Yuma. Most years we do not get what I would call winter weather except for a week or two here in Southern NM and generally it is warmer in AZ but not always :)
