The pesky cutoff has essentially left us and we are now dealing with a fairly typical monsoon pattern, albeit one that is fairly dry in low-levels. The dry low levels are the remaining effect of the cutoff's westerly flow regime in low levels. But this is of little use if we develop an entraining boundary layer again this afternoon. IF boundary layer mixes well and keeps the average moisture contents this morning. P chart of the 12 UTC sounding from Luke Air Force Base on July 21, 1994.
Wind speeds are in knots.
The small box indicates the location of Phoenix, and the Salt and Verde River Basins are outlined. No outflows or local forcing strong enough to lift this air developed. There was flash flooding in the area. Only a very weak outflow moved across the Valley during the evening.