This week’s satellite image was taken this morning. It shows the clear boundary between clouds and clear skies that is associated with the leading edge of an upper atmosphere trough.
We can see this same effect on the water vapor imagery; in approximately the same location, there is dryline that separates moisture and dry air. The water vapor imagery is most effective for the 700 mb to 400 mb layer.
The NAM model shows the trough at the 300 mb level, just for reference.
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