Cross section of Div Q (blue shading), frontogenesis (shaded) and omega (brown contours) (February 13, 18 UTC 30-hr NAM forecast)

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Cross section of Div Q (blue shading), frontogenesis (shaded) and omega (brown contours) (February 13, 18 UTC 30-hr NAM forecast)

Notes:

By 00 UTC on the 15th, the Q-vector convergence associated with the upper-wave has merged with the Q-vector convergence associated with the lower-to-mid tropospheric frontogenesis, resulting in a deep layer of Q-vector convergence. The heaviest precipitation rates along the cross-section occurred as this merger took place between 18 UTC and 00 UTC.