It was about as dry as it can get yesterday afternoon in Tucson area. Surface observations at the airport (above) were indicating RH of 1 %. The Td measurements by the NWS ASOS are least accurate when values drop below 0 C, and what we can say with certainty is that the RH fell to extremely low values.
Here at the house, morning low temperatures have been quite cool and very pleasant - lows last three mornings were (with airport highs in parens): 14th 52 F (103 F); 15th 54 F (106 F); and 16th 56 F (TBD). With the 50+ F diurnal temperature swings, afternoons have seemed brutal.
The current NWS forecast for the next five days (below) indicates things will get considerably worse. Take care.
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