On the precipitation regions within two storms affecting Atlantic Canada

Abstract Two storms that produced heavy precipitation during the Canadian Atlantic Storms Program (CASP) field project are examined, with particular emphasis on their northern and western sectors. Precipitation was associated with upwards motion along the edges of an elevated warm core north of the surface low centre. Within the general pattern of precipitation, the highest rates occurred in narrow bands that were generally aligned with isotherms. The warm core contains regions of marginal symmetric instability and some of absolute instability.