Yesterday ended up producing a nice storm and rain event across the Tucson metro area. Here at house the first storms built south off the Catalinas around 5 pm. These were followed by a couple of lighter showers at dusk. Total here at house was 0.40". TUS recorded 0.56" and Atmo had 0.79 (this was the highest amount I noted in the Tucsons area), while DM AFB had only 0.19". Rain was recorded at 86 of the 93 ALERT sites (>90% areal coverage with most of it falling before 9 pm MST). Amounts were not heavy with only three stations recording just over half an inch. Forecasts were under-done yesterday, with considerably more convection and rainfall than anticipated. The early WRF-GFS did not predict the increase of PW that occurred steadily through the day yesterday (see above GPS time series with amounts rising to 1.8" during the storms). The noon sounding was considerably more favorable for storms than had been the morning sounding, especially when one considered the additional PW indicated by GPS - see previous post below.
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