Starting tonight and lasting partly into Wednesday amounts of 30-70mm are expected to fall over a large part of Alberta. The significance of this system is the time of year. All time records for a singly day rainfall in April are lower, around 25-50mm. This means that the forecast amounts are record breaking.
I’ve made this map to show where I believe the heaviest rain could fall. The Drayton Valley, Pigeon Lake area could see the most
While climate Data seems to be hard to find I have found a few sites in the heaviest rains that may set a new monthly 24 hour rainfall record. In which the forecast is within 5mm or is experted to exceed the record
Edmonton intl: 43.4mm set on the 23rd of April 1990(daily plus monthly record)
Edmonton City centre: 27.2mm set on the 20th of April 1940
Camrose: 22.1mm set on the 30th of April 1951
Stony plain: 40.2mm set on the 23rd of April 1990(daily plus monthly record)
Wetaskiwin: 21.6mm set on the 23rd of Arpil 1990(daily plus monthly record)
Nordegg: 21.2mm set on the 24th of April 1983
Red Deer: 48mm set on the 30th of April 1951
Whitecourt: 24.2mm set of the 24th of April 1991
Stay tune for more updates. EC will likely issue a summary of the if records are broken.