AIRCRAFT ICING MEASUREMENTS IN EAST-COAST WINTER STORMS

Analysis of the aircraft icing environments of East Coast winter storm s have been made from 31 flights during the second Canadian Atlantic S torms Program. Microphysical parameters have been summarized and are c ompared to common icing intensity envelopes and to other icing dataset s. Cloud regions with supercooled liquid water had an average horizont al extent of 4.3 km, with average droplet concentrations of 130 cm(-3) , liquid water contents of 0.13 g m(-3), and droplet median volume dia meters of 18 mu m. In general, the icing intensity observed was classi fied as light, although moderate to severe icing was observed in sever al common synoptic situations and several cases are discussed. Freezin g drizzle was observed on four flights, and represented the most sever e icing environment encountered.