Plot of lightning strikes for past 24-hours ending 6 am MST today (23 July 2013) is shown above. Another very quiet day across almost all of Pima County. At 6 am this morning the ALERT network data indicate that 13 of 92 sites (~14 %) had rainfall during past 24-hours. Most were high elevation sites and 11 of the reports were for rain occurring before 5 pm yesterday afternoon.
Very little change during past 24-hours. Atmosphere remains moist with PW values of 1.50 to 1.75 inches across southern Arizona; 500 mb temperatures this morning are warm at -4 to -5 C; and winds through the troposphere are light and variable. The early WRF-GFS forecast a few showers in eastern Pima and Santa Cruz Counties this afternoon, with more activity forecast over Cochise County (map below shows forecast rainfall through midnight tonight). Synoptic situation is basically blah today.
The ALERT site has a number of interactive capabilities and I used these to generate 30-day rainfall totals ending at 6 am MST this morning. Below are three of the sector maps - top is Catalinas, middle is Rincons and east metro, and bottom is west metro. Most rainfall so far this summer has been in the Catalinas and along the I-10 corridor. Amounts have very large gradients with minimum of 0.28" west of the Catalinas and maximum of 10.47" at Mt. Lemmon.
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