There were occasional light showers here at the house yesterday afternoon, as more snow fell over the Catalinas - view above from campus at 4:00 pm MST. We ended up with another 0.03", the airport had a Trace, D-M measured 0.02", as did Atmo. The 12 UTC forecast yesterday morning from the WRF-GFS (below for precipitation amounts through 6:00 pm) was fairly accurate, in my subjective evaluation.
This was a case where there were probably many measurable amounts of precipitation (at least 0.01") that were below the precision of the ALERT gauges which don't record/detect amounts below 0.04". The two ALERT sectors shown here indicate many amounts of 0.00" - there was only snow at higher elevations of the Catalinas (above) and either no precipitation or amounts less than 0.04" at many gauges in the west metro area (below). So, the only coverage I can up with is that about 60% of the ALERT sites had 0.04" of rain or were in snowfall locations - what happened at the other sites is a known unknown.
At bottom is image from Russ Scott of snow cover seen from one of flux sites near Tombstone.
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