Tuesday, September 04, 2012

Brief Summary of Labor Day

Yesterday's storms primarily affected the southern portions of the area, as forecast. Across the ALERT network there were 13 sites with rainfall. Most of these were well south of the metro area. Above is plot of 24-hour rainfall over the southwestern portion of the ALERT network. Note that 8 ALERT sites reported more than half an inch of rain and 3 sites had over an inch. Also of interest - Nogales had 1.20" and Douglas had 0.79" and in the RAWS network both Mt. Hopkins and Empire reported more than inch..

Below is a plot from WXunderground stations at 6 pm MST last evening. At that time there appear to be two, separate outflows intruding into the Tucson area from storms to the south. I've plotted the Rincon RAWS potential temp (99F) reduced to the elevation of TUS, to illustrate that that observation was taken well above the outflows. The plot illustrates how complex the local mesoscale details can become. The data from Atmo indicate that three different outflows passed there from late afternoon well into the night. The outflows have helped bring high PW air into all of southern Arizona today. The early WRF-GFS is forecasting a very active day today and I'll take a look at the forecasts a bit later.

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