Skies have been mostly cloudy today as the broad trough at 500 mb continues to affect southern Arizona (current view of Catalinas above). The surface observations for TUS (below) indicate that low clouds and overcast skies have prevailed since about 4 am this morning. The clouds kept low temperatures about 10 F warmer than were observed yesterday (34 F here at house this morning compared with 23 F yesterday morning). Bottom graph of solar radiation at Atmo shows the dramatic difference yesterday to today.
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