August 13 CFD
August 13 Height falls associated with cooling aloft overspreads much of Alberta on Sunday, as an elongating upper trough of increasing negative tilt digs eastward across BC. Southerly and even southeasterly mid-level flow about the base of the trough will begin to rotate into the province as the upper ridge moves off to the east. The surface pressure field initially responds with deepening lee troughing and the development of a surface low over central sections of the province during the afternoon. Some moisture convergence occurs into the trough and in the vicinity of the developing low, with added terrain effects enhancing pooling along the northern foothills and Swan Hills areas – however, southeasterly flow will not be laden with rich moisture as it originates from drier locales. Therefore, despite progged dewpoints into the low and even mid teens in parts of central Alberta, there is low confidence it will be of any significant depth – due also in part to its brief reside