However, humidity levels increase markedly heading into Friday ahead of an approaching cold front from the northwest. Humidity levels could become a bit more elevated by Sunday, but look to be lower than Friday overall. The soupiest of air is largely going to be locked further south the next several days, thanks to the orientation of the jet stream. Ridging is in place over the Desert Southwest, which directs the jet stream over us to be out of the northwest. Storm chances will be periodic, and dependent on smaller ripples of energy that flow along the jet stream.