Atmosphere is very dry over the Southwest, with PW for the morning Tucson upper-air sounding at only about 4 mm - RH yesterday afternoon dropped to near zero values (only 2% during late afternoon). Very nasty.
I peeked at the 00 UTC forecasts from Atmo's WRF-GFS model. Shown below is the forecast of PW valid at noon on 22 June next week. Bit of hope in that forecast, as higher PW creeps northward up the GoC and sneaks into parts of Arizona.
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