Some dust blowing in over the Catalinas a few minutes ago at about 11:20 am MST.
A strong, 500 mb closed low is forecast by 12 UTC GFS to be moving across Arizona at 5:00 PM this afternoon (above).
The passage of this system has led to a Red Flag Warning for most of southern Arizona (above); as well as wind and blowing dust advisories at the airport (below).
Will post a winter summary tomorrow.
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