Mike Leuthold comments re question below - I believe it's partially due to downsloping caused by the higher terrain of central Pima county. You can see a drying in the 850 layer over Pinal and eastern Pima in the model data. Also a factor, the moisture plume (see above) is centered over western Pima into Maricopa during the day today and it's quite dry at 850 from eastern Pima eastward.
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