Besides moisture, instability and orographic lift, the next biggest factor that contributes to heavy or extreme rainfall is storm dynamics.
Weather
Storm dynamics and extreme rainfall
Besides moisture, instability and orographic lift, the next biggest factor that contributes to heavy or extreme rainfall is storm dynamics.
August rain welcome, but offered limited relief
Increased precipitation in August aids farmers prior to harvest in southern prairies of Canada.
Factors that can cause heavy rainfall
There are several factors that can contribute to an extreme rainfall event, the first is atmospheric moisture.
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Southern Alberta receives needed moisture
Canadian Drought Monitor Report for July shows severe drought continuing to grip farmers in Alberta and the Prairies
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Above average temperatures expected
July was a cooler than average month right across the Prairies, with most places coming in just slightly below average.
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Stories from our other publications
August rain welcome, but offered limited relief
Northern Prairies still dry, while late summer precipitation came too late to boost crop yields in many regions
Increased precipitation in August aids farmers prior to harvest in southern prairies of Canada.
Manitoba Crop Report: Harvest nearly one-third complete
Fall rye, winter wheat near completion
Despite varied amounts of rainfall, Manitoba's harvest advanced to 29 per cent as of Sept. 1, 2025.
Prairie forecast: Cool east, warm west
Forecast issued September 3, covering Sept. 3 to 10, 2025
We start this period with a large upper low over northern Ontario, an area of Arctic high pressure building southwards over Manitoba and strong but narrow upper ridge of high pressure over B.C. This particular setup is going to bring cool temperatures over the eastern Prairies for the next several days. Western regions will stay on the mild side.
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Factors that can cause heavy rainfall
There are several factors that can contribute to an extreme rainfall event, the first is atmospheric moisture.
Prairie forecast: Warm and dry for the long weekend
Forecast issued August 27, covering Aug. 27 to Sept. 3, 2025
This forecast period is looking straightforward as surface high pressure and upper-level ridging looks to dominate the forecast. This should bring what looks to be an extended period of sunny skies and warm to hot temperatures.
Claims filed in Alberta hailstorm aftermath
Massive storm in southeastern Alberta causes significant damage to crops and reported deaths of livestock
The numbers are still coming in for the cost of the damage caused by a huge hail storm that hit various areas of Alberta Aug. 20.
Relative humidity linked to dew point
The dew point is the temperature that we would have to cool the air down to for condensation (or dew) to begin forming.
Prairie forecast: Sunny, warm end to the month
Forecast issued August 20, covering Aug. 20 to 27, 2025
To start this forecast period, we have an area of low pressure developing over Montana. This will help bring one more day of intense heat over southern Saskatchewan and a hot day over Manitoba. That same low will bring partly cloudy skies and the chance of showers to a good portion of Alberta.
