As the weak shortwave trough passed by Arizona, substantial changes took place in the 500 mb pattern. The anticyclone is now centered to the west of Baja. Thus, Arizona is covered by deep, westerly flow of dry air. P chart of the 12 UTC sounding from Luke Air Force Base on July 13, 1994.
Wind speeds are in knots.
The small box indicates the location of Phoenix, and the Salt and Verde River Basins are outlined. There were almost no clouds over the state again today. The was isolated convection and a thundershower or two in the far northeast corner of Arizona.