Several Severe Thunderstorm Watches and Warnings were issued for the southern Red River Valley Saturday afternoon and early evening as scattered storms rolled across the region.
“A trough of low pressure sinking southward through the area was the trigger for the development,” noted CMOS Accredited Weathercaster Chris Sumner. “Some locations saw a couple rounds of showers and thunderstorms, and as is typical with this type of convective development, those places that had a storm roll overhead saw a significant amount of rainfall.”
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The following totals are courtesy PembinaValleyOnline Rainwatchers, Environment Canada and the Manitoba Ag Weather Network:
Manitou – 30.3mm (1.2 inches)
Pilot Mound – 21.9mm
Winkler (south of city) – 18.1mm
Woodmore - 12.5mm
Clearwater – 10.6mm (about 4/10)
Steinbach – 9.5mm
Jordan – 6.3mm
Windygates – 3.5mm
Altona – 2.4mm (about 1/10th)
Emerson – 1.5mm
Reinland - 0.6mm
25mm = 1 inch
Hot humid conditions will continue Sunday, with highs once again pushing toward 30, and Humidex values heading into the mid 30s.
“Upper level ridging continues over the region, meaning the airmass we’ve had for the last few days will also stick around,” said Sumner. “Another trough of low pressure sweeping southward this afternoon and tonight could provide the trigger for additional thunderstorms and showers Sunday evening and overnight.”
Hazy conditions will also continue Sunday and Monday, as forest fire smoke from northern Canada is transported southward by an upper northwesterly flow. Daytime highs Monday will be a few degrees cooler than Sunday, but it will still be humid.
“A cold front moving through the province Monday into Tuesday will bring an end to this most recent hot and humid stretch, with slightly below averages temperatures expected Tuesday and Wednesday between 23 and 25 degrees,” he said. “The hazy conditions will also end after the cold front passes. That cold front could also lead to thunderstorm development Monday afternoon.”
Meanwhile, Sumner noted warmer conditions will build in for the back half of the week, as an upper level ridge over Saskatchewan builds eastward. Daytime highs are expected to head toward 30 as we get to the final weekend of July.