Two 500 mb data plots for 12 UTC this morning - Thursday March 4, 2010 - are shown above. The lower panel shows the weaking cutoff and S/W that is currently over the Great Basin. This feature moves by during the day today, brushing northern Arizona. Satellite imagery this morning indicates the only cloudiness with this system is currently over far northwest Arizona.
The top panel extends far enough north to show Alaska - it is of interest that 500 mb temperatures are very cold over the Gulf of Alaska, -35C to -40C. The models forecast the next feature to impact Arizona will dig southward from the Gulf tomorrow and Saturday, pulling some of this very cold, middle level air along with it.
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