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Significant summer rainfall in the Canadian Prairie Provinces: modes and mechanisms 2000–2004

This study analysed nearly 1000 significant (≥10 mm in 24 h) summer rain events that occurred within the boundaries of the Canadian Prairie Provinces from 2000 to 2004. The objective of this examination was to identify the mode of each event (i.e. solely or partially convective versus non‐convective), and its primary forcing mechanism (i.e. source of lift). Daily rainfall and lightning maps revealed that most of the significant rain events (79%) were solely or partially convective (i.e. lightning was recorded during the event), while 88% of the total rain area, a measure of the impact of each event, was from events with moist deep convection. Average monthly percentages varied. In June, 74% of the events were solely or partially convective, in July 85%, and in August 79%. In June, 84% of the rain area was from events that were solely or partially convective, in July 93%, and in August 86%.