In what could be our final Severe Thunderstorm Warnings of the season, portions of the Pembina and Red River Valleys received rainfall late Labour Day Monday afternoon and early evening.
According to CMOS Accredited Weathercaster Chris Sumner, at one point, Environment Canada had Warnings in place for about a half dozen municipalities across the region including Lorne, Louise, Pembina, Dufferin, Thompson, Roland, Rhineland, Montcalm, Morris and Emerson-Franklin.
"We had just enough instability in the atmosphere Monday for a strong cold front sweeping through to provide the trigger to kick off a line of storms, that at one point, stretched from east of Steinbach southwestward to west of Morden," said Sumner. "That cold front also brought an end to a stretch of unseasonably warm temperatures for September Long Weekend. Daytime highs Friday through Monday flirted with 30 degrees, which is seven to eight degrees above the average of 22 degrees for the start of the month."
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Sumner added, the strongest thunderstorm cell within the line which tracked east-southeast, was in the Lowe Farm/Kane area.
"Not only did this particular storm drop a significant amount of rain, as seen in the total below, it also packed gusty winds."
Peak wind gusts during the storm system's passage yesterday included: Dominion City - 80 km/h; Brunkild - 73 km/h; Kane - 68 km/h; Austin - 62 km/h; Holland - 61 km/h
The following totals are courtesy our PembinaValleyOnline Rainwatchers and the Manitoba Ag Weather Network, and are for Monday, September 1st:
Kane - 60.4mm - (about 2.4 inches)
Dominion City - 27.2mm (almost 1.1 inches)
Snowflake - 21mm (about 8/10)
Steinbach - 13.6mm
Woodmore - 12.5mm (1/2 inch)
Morris - 11.4mm
Carman - 8.4mm
Rosenfeld - 7.5mm (3/10th)
Elm Creek - 5.4mm (about 2/10)
Altona - 4mm
Plum Coulee - 3.56mm
Manitou - 2.4mm (almost 1/10)
Reinland - 0.4mm
25mm = 1 inch
"Much cooler weather is in the forecast for Back to School week, as an upper level trough develops over the Prairies, and surface high pressure sinks southward out of Canada's north," noted Sumner. "Daytime highs will continue to slide lower Tuesday and Wednesday, with Thursday looking to be the coolest day of the week, and also potentially the next opportunity for more precipitation. A low coming out of Alberta and crossing Saskatchewan and Manitoba may bring another round of rainfall then."
He noted conditions are expected to warm back to seasonal after that, with sunshine expected for the first weekend of September, and highs pushing toward averages for the season.