Update at 11 a.m. Saturday - the Special Weather Statement has ended for the Morden, Winkler, Altona and Morris areas. A Rainfall Warning has been issued for the Pilot Mound, Manitou and Carman regions with a possible 40 to 60mm possible Saturday. 

Several rounds of severe thunderstorms Friday have drenched Southern Manitoba, with even more rainfall on the way Saturday. Environment Canada has issued a Special Weather Statement for all of Southern Manitoba, with an additional 20 to 50mm expected by Saturday night on top of the 50 to 100mm which has fallen in some areas since Thursday evening.

Courtesy of Manitoba's Ag Weather Program and Environment Canada, here are some of the rainfall totals from Friday morning through Saturday morning at 9am:

Altona - 100mm

Carman - 42mm

Elm Creek - 47mm

Manitou - 33mm

Morris - 86mm

Winkler - 39mm

Dominion City - 101mm

Rosa - 121mm

Gardenton - 119mm

Zhoda - 142mm

"Yesterday's rain events were driven by the thunderstorm activity embedded within the system," explained CMOS Accredited Weathercaster Chris Sumner. "With so much moisture in the atmosphere that had been pulled up from the United States, it was primed for very, very heavy rainfall, and that's exactly what we saw, with those areas which did see thunderstorms receiving the highest amounts."

Rainfall accumulations through Saturday evening will likely be in the 20 to 50 mm range for most areas. Many areas across southern Manitoba have already seen 50 to 100 mm of rain since Thursday night. However, according to Environment Canada, like Friday, Saturday's rainfall will have many convective elements which means within the area of rain there will be embedded areas with much higher rainfall intensities. Depending on exactly where these develop, some localized areas could see higher accumulations in the 50 to 75 mm range from Saturday morning to the time the rain tapers off later tonight.

Loonie-sized hail in Morris area Sept. 20. Photo submitted by Riggs Thiessen.

"Some areas of Southern Manitoba have already received an entire season's worth of rainfall over the last 48 hours, so you can imagine what even more precipitation will mean for the region," added Sumner. "I realize this may not come as much comfort to those dealing with localized flooding in their respective areas, but this rainfall will go a long way to recharging sub-surface soil moisture levels which have been reduced significantly over the past two dry, hot summers."

Some areas may end up with three day rainfall accumulations approaching 175 to 200 mm should these more intense areas of rain develop over regions that have already been hit hard by the previous storms that have moved through the province.

Sumner notes, after another wet day Saturday, the weather will start to turn drier on Sunday with cloudy conditions expected, but little chance of additional rainfall. High pressure is expected to return to Southern Manitoba Monday, which will help clear the sky, and bring a return to sunshine. Temperatures will be closer to seasonal for most of the week, after starting slightly above average for this time of year Monday and Tuesday. Daytime highs those days will be in the 19 to 21 range, with highs Wednesday through Friday in the 15 to 17 range. The average daytime high for this time of year is 18.