Wednesday, November 18, 2009

Low temperatures last several mornings


As the photo above shows, we've had another night with clear skies and strong radiational cooling here in Tucson. The low temperatures here at the house (near the Rillito Wash on the north side of Tucson) for the last three mornings have been: Monday Nov. 16 - 26F (39F); Tuesday Nov. 17 - 27F (53F); and Nov. 18 - 36F (48F). The temperatures in parens are the official NWS observed morning lows at Tucson International Airport (TUS). The winds has kept things warmer down south at the airport; whereas, each morning here at the house it has been calm. The remarkable 26F difference between here and the airport on Tuesday morning is the largest that I've observed - beating the previous record of 23F! I also suspect that the temperature down at the Rillito was several degrees cooler than here at the house - so there's the low down.
No measureable rain here since October 2/3 but it does appear there was a sprinkle trace on Saturday the 14th. It did rain on Saturday where we were, 5 NW of Sonoita, as I suspected it would. The orographic forcing there is quite good with S to SW low-level winds.

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