Q divergence and frontogenesis
Notes:Large-scale forcing associated with this event is shown on this slide. The green contours are NAM 12 hour forecast 500-300 mb Q vector convergence, with dashed contours indicated convergence, or large-scale forcing for upward motion. The blue shading indicated 700-500 mb frontogenesis. In this case, large-scale forcing for upward motion associated with the upper wave (indicated by dashed contours) was becoming superimposed with forcing for upward motion associated with a mid-level frontal zone approaching from the west. |
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Valid Wed 0000 UTC 23-Jul-2008 Valid Wed 1200 UTC 23-Jul-2008 |
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Slide 9