If you go to
www.AZ511.gov/ you will find the latest updates on the highways through Arizona. Click on "statewide map - cameras / delays and more" and you will see a map of Arizona roads. There are cameras along I 40 that will show you exactly what is happening!
Today there is snow around Flagstaff, but only rain elsewhere.
The forecast is for more snow, so you are wise to continue to check the status. I 40 is shut down for weather fairly often!
Bob