Tucson's afternoon high hit 101F today - see surface observations above. This is the second earliest date on record for a high temperature of 100F or more at Tucson. Another diurnal swing of 50F here at the house.
Another issue - note the strange visibilities that are popping into the observations once in awhile. Three very low visibilities are reported above, with the 2 pm visibility reported as less than a quarter of a mile in haze. This has been happening during the afternoon on a number of days during the past week week or so. Either the ASOS system is out-of-whack, or construction or something similar is generating clouds of dust once in awhile that are blowing across the ASOS sensors.
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