Abstract
During the Canadian Atlantic Storms Program (CASP) field project conducted from 15 January to 15 March 1986, microphysical measurements were made using two instrumented aircraft: a Twin Otter and a DC-3. Measurements tended to be made over Nova Scotia and on the northern side of the low pressure centre. For 90% of the time in cloud, the aircraft were at temperatures between 0 and −12°C. Cloud droplet concentrations varied from low values to greater than 700 cm −3 with median values between 50 and 100 cm −3. Ice crystals were usually present during cloud penetrations and high concentrations occasionally occurred with higher than normal liquid water contents. Precipitation formation was through an ice crystal aggregation process. Severe icing conditions occurred on a few occasions for both aircraft, and the microphysical character of these clouds have been documented.
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