Cool and unsettled conditions will be the main story for the upcoming Thanksgiving weekend over southern MB. A sharp frontal boundary is forecast to develop across the Dakotas on Saturday before a storm system tracks across southern MB on Sunday, followed by windy and cooler conditions on Thanksgiving Monday. The details..
Saturday should be cloudy and cool across southern MB as the frontal boundary begins to set up across the eastern Dakotas into northern Minnesota. This boundary will be separating warmer and drier conditions to the east from cool and wet conditions to the west. An area of rain will develop along this frontal boundary over the Northern Plains and spread into southern MB Saturday afternoon and evening. Rain may become heavy at times Saturday night into Sunday morning, with thunderstorms possible, as a low pressure system develops over the western Dakotas and tries to spread warmer air into southern MB. Rain from this system will continue to spread to the north and west of Winnipeg on Sunday, so there may be a break from precipitation Sunday afternoon over the Red River valley and SE Manitoba. Sunday night, a cold front from the low will sweep across Southern MB, bringing windy and cooler conditions on Monday, with clouds and a chance of showers.
My holiday weekend forecast for Winnipeg. Note that the timing of the precipitation will be subject to change based on how these systems develop over the next day or two. At this time, this is what the models are saying.. (updated Saturday morning)
Saturday..Cloudy and cool. Chance of showers this afternoon. High 9.
Saturday night..Periods of rain developing. Low 7.
Sunday..Rain heavy at times tapering off in the afternoon. Chance of a thunderstorm. Total rainfall amounts 15-25 mm. High 14.
Sunday night..Chance of showers. Low 5.
Monday..Mostly cloudy, breezy, cooler. Chance of a shower. High 8.