Precipitable water has been increasing slowly the past 24 to 48 hours as Hurricane Rick's influence has inched the boundary between dry continental air and the subtropical air in Mexico northward. Values have reached around an inch over southeast Arizona and may help fuel additional storms today - particularly if the warm layer of air above 500 mb cools as the strong S/W over the Pacific begins to move toward Arizona. Unfortunately, there is no morning upper-air sounding available from Tucson this morning. Regardless a slight bit of local weather to keep up our interest.
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