Cross section of Div Q (blue contours), frontogenesis (shaded) and omega (brown contours) (February 13, 18 UTC 24-hr NAM forecast)

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Cross section of Div Q (blue contours), frontogenesis (shaded) and omega (brown contours) (February 13, 18 UTC 24-hr NAM forecast)

Notes:

At 18 UTC, two separate maxima of Q-vector convergence can be seen. One associated with lower-tropospheric frontogenesis, and one associated with the approach of the upper-level wave.