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Weather forecasters frequently miss sudden changes in the intensity of Lows and Highs, and even more frequently miss rapid changes of pressure not associated with the centers of systems. The complex combination of circumstances which results in pressure change is only partially understood in the best of situations, and most forecasters still rely heavily on simple extrapolation of the past movement and intensity of systems and their changes for the construction of prognostic pressure fields. Attempts to forecast major changes in these properties, while frequently successful, have rarely been based on complete understanding of the processes involved. A case history such as this cannot possibly close the gaps in the basic understanding of pressure changes, but it will attempt to record for whatever purpose it may be useful, the change in mass, at least, about a rapidly deepening Low, and to deduce therefrom an instructive, though admittedly incomplete, explanation of the deepening.

CHANGES IN THE VERTICAL MASS DISTRIBUTION IN THE VICINITY OF THE RAPIDLY DEEPENING LOW OF MARCH 24–26, 1954