Moderate instability and a stationary front may give rise to some thunderstorms across southern Saskatchewan. Small hail, gusty winds, and heavy rainfall will be the primary hazards with these storms.
Cooler temperatures could bring some wet snow above 2200 metres in the Rockies, with the wintry precipitation tapering off by Monday.
Will this rain set any new records?
Rainfall totals may exceed 100 mm across the Edmonton area.
A swath of 50-75 mm of rain may fall across a region extending from Hinton in the west to Lloydminster in the east, and from Red Deer in the south to Athabasca in the north.
While significant river flooding is not in the forecast, localized flooding will remain a concern, especially in urban areas such as Edmonton proper. Downpours can cause ponding on roadways, as well as swift runoff that can overwhelm storm drains.
Given the extent and duration of the heavy rain expected, Sunday could end up as a top-ten rainiest June day in Edmonton. The gauges have to pick up more than 46.7 mm of rain on Sunday to push the date onto that top-ten list.
WATCH: El Niño is officially here and it may make history