PembinaValleyOnline News

Several rounds of severe thunderstorms have left parts of the Pembina and Red River Valleys drenched Tuesday morning. Not one, not two, but three waves of severe thunderstorms rolled through the region, with Warnings issued for the Morden, Winkler and Altona areas three times between late afternoon Monday and early this morning.

Updated at 5:10 a.m. Tuesday, September 17th - all Severe Thunderstorm Watches have ended in the Pembina and Red River Valleys

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Updated at 7:27 p.m. Monday, September 16th - Environment Canada has ended all Severe Thunderstorm Warnings in the Pembina and Red River Valleys. A Severe Thunderstorm Watch continues for the regions, though, with the possibility of additional storms developing Monday night.

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A slow moving line of showers inched across Southern Manitoba Friday, bringing light to moderate accumulations to many regions..

"The area of precipitation was associated with a low that was moving more northerly than easterly, and that's why the general direction of the showers was from south to north, with a very slow progression easterly throughout the day," explained CMOS Accredited Weathercaster Chris Sumner. "Where embedded thunderstorms developed, higher rainfall totals have been recorded due to how long it took for the area of precipitation to move from any given area."

The Pembina and Red River Valleys woke up to rainfall Thursday morning, and another round of accumulating precipitation.

"A low moving into the province from Saskatchewan was responsible for the rain," explained CMOS Accredited Weathercaster Chris Sumner. "As the main area of precipitation moved out of North Dakota early Thursday morning, the embedded thunderstorms within it weakened."

Severe Thunderstorm Watches had been in effect for a few hours early Thursday morning for the Morden, Winkler, Carman, Altona and Morris regions. Those were ended before 7 a.m.

An early morning round of showers and thunderstorms had PembinaValleyOnline Rainwatchers checking their gauges before noon Thursday.

“An area of showers and thunderstorms that pushed out of central North Dakota then moved northeasterly across Southern Manitoba, and brought another round of accumulating rainfall to the region,” explained CMOS Accredited Weathercaster Chris Sumner. “Most of the precipitation fell between 4am and 10am Thursday, with it out of the region before noon.”

A nearly 24-hour period of light to moderate rainfall Wednesday afternoon to Thursday evening brought the first significant, accumulating precipitation to the region in two to three weeks, depending on what point you are referencing.

A weak disturbance sliding through Southern Manitoba Sunday morning and into the afternoon led to many PembinaValleyOnline Rainwatchers seeing something in their gauges by last night.

A very slow moving area of thunderstorms has brought excessive precipitation to the Altona, Gretna and Rosenfeld regions with streets in downtown Altona overflowing the curbs.

"The isolated thunderstorm cells popped up before 8am north, west and east of Morris, and since then have very slowly been tracking southward," noted CMOS Accredited Weathercaster Chris Sumner. "The storms were moving extremely slowly, and because they were moisture packed, that gave them the opportunity to unload considerable precipitation as they dragged southward."

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.”

Monday morning started with cracks of thunder, flashes of lightning and gusty winds as thunderstorms move through the area.