An area of low pressure in the Gulf of California is going to streamline moisture into the four corners this week. This low is not likely to see tropical development but is listed as a low chance by the National Hurricane Center and is being monitored for it's moisture as it moves into the U.S.
A MODERATE threat for heavy rainfall and flooding has been added for portions of Arizona in anticipation of this increased moisture. Cities like Phoenix, AZ will be under a level 3 out of 4 flooding threat.

Rainfall totals could exceed several inches. Do not drive through flooded waters. Be on higher lookout for mudslides and debris flows from recent burn scars.
The Storm Prediction Center (SPC) has also added a MARGINAL risk for a few stronger to severe storms in Utah. Salt Lake City and Provo are included in the threat for strong winds and larger hailstones.
Below is the latest on the timing of these showers and storms.
More details can be found during your Western Regional Forecast, :50 past the hour on WeatherNation.