A STUDY OF A CASP STORM - ANALYSIS OF RADAR DATA

The morphology and time evolution of a winter storm is studied using r adar data taken during the Canadian Atlantic Storms Program (CASP). Th e vertical motions that generate the snow are derived from reflectivit y measurements. The study reveals a banded structure in the precipitat ion pattern with ascending and descending air associated with the band s. Vertical velocities averaged over the radar-covered area reach valu es close to 1 m s-1. The region of large-scale uplifting moves horizon tally at about half the horizontal air velocity. A persistent precipit ation pattern results from the continuously renewed air within the upl ifting region.