July 6 Convective Discussion
A threat of severe thunderstorms will develop across much of southern and central Alberta on Saturday, with all severe hazards possible. A 40 knot mid-level jet maximum noses into the Alberta Rockies on Saturday southeast of a slow-moving upper low centered over SW British Columbia, resulting in lee troughing and attendant low level moisture advection that pools into the foothills during the day. Low to mid teen dewpoints can be expected along the foothills, with higher mixing ratios likely with northern extent in the threat area, aided by evapotranspiration of vegetation and the ground surface owing to more abundant recent precipitation across the region compared with areas further south. In the absence of any major perturbations in flow aloft, convection will likely be initiated by a combination of pooled low level moisture and lift along the terrain, beneath subtly falling mid-level heights during the afternoon. Large scale ascent associated with the exit region of a curve