Cross section of Div Q (blue contours), frontogenesis (shaded) and omega (brown contours) (February 13, 18 UTC 12-hr NAM forecast)

First page Back Continue Last page Research

Cross section of Div Q (blue contours), frontogenesis (shaded) and omega (brown contours) (February 13, 18 UTC 12-hr NAM forecast)

Notes:

This pattern persisted through 06 UTC on the 14th; the Q-vector convergence maxima was co-located with the frontogenesis maxima, indicating that lower-to-mid tropospheric frontogenesis was the main contributor to the upward motion forcing at that time.