Web cam view of storms north of Kitt Peak at about 6:45 pm MST yesterday afternoon. Storms during the afternoon yesterday tended to be locked onto higher terrain in southeast Arizona. During the night some storms in the Phoenix area built southward. An outflow with these apparently triggered storm development over the Catalinas. We had lightning and thunder here at the house as cells tried to move off the Catalinas and dissipated overhead - mostly around 1:30 am and again around 3:30 am. Rain with the showers amounted to only 0.17". Storms were mostly confined to the higher elevation areas from Oro Valley around north Tucson and the Catalinas over to the north part of the Rincons. Hard to tell how many ALERT stations had rain after midnight, but it appears that, while the high elevations sites had nearly 100% coverage, only around 20% of the Greater Tucson gauges had rain.
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Another difficult day as two lobes of the 500 mb anticyclone butt heads over southeastern Arizona. The lobes are centered over northwestern Louisiana (primary center) and northern Baja. Arizona is mostly under a fetch from the Pacific today (PW down to an inch out at Yuma), that is trying to bring some drier air toward Tucson. However, 500 mb temperatures are relatively cool in this flow. Since some low-level moisture is pooled over southeastern Arizona, expect isolated mountain storms today, with best activity probably along the borderlands to south.
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