Saturday, August 03, 2024

Light Shower Yesterday


View of Catalinas at 5:35 am MST this morning. Down at bottom is view of Orion rising over the Rincons at 4:00 am.


There were numerous thunderstorms over eastern Pima County during the evening yesterday - plot of detected CG flashes (above, from Atmo and Vaisala) for 24-hours ending at 0703 UTC.


Observations from the ALERT network (above and below) for 24-hours ending at 6:00 am this morning show that rainfall was mostly in the northeast portion of the network - note several reports of over an inch near Oro Valley. Here at the house we had rumbling thunder, but only a light shower that left 0.01" in the gauge. Atmo also reported 0.01"; DM had 0.22" and gusts to 43 mph; and the airport noted only a Trace.



The 500 mb analysis this morning (above, from SPC) shows the huge anticyclone over the West. With Denver and Albuquerque both missing, it is hard to tell if there is only the circulation center over southern Wyoming or if there might be a second center over New Mexico. The morning sounding from TWC/TUS (below, also from SPC) indicates a large drop in PW (compare with previous post); a deep, old boundary with only a sliver of CAPE; and light variable winds below 300 mb.



Forecast above is from the 12 UTC run of the WRF-HRRR at Atmo and shows rainfall through midnight tonight. Longer term forecast (below from 06 UTC GFS) indicates significant rains for Arizona through noon next Saturday.


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