This week will feature near normal conditions as we cool down a bit from a sultry Sunday.
Monday
Today will feature near normal weather in southern Manitoba as temperatures climb into the mid twenties. There will be a chance of showers through the day as an upper-level impulse rolls through, but little in the way of accumulation is expected. Despite the calm weather in Manitoba, conditions just south of the border look to be quite different.
A very hot and extremely humid air mass are located over the eastern Dakotas and Minnesota today. This air mass will become extremely unstable by late afternoon, characterized by MLCAPE values of 4000-5000 J/kg (CAPE is a measure the potential energy/fuel for a thunderstorm), or perhaps even higher in localized pockets. Favourable wind profiles will allow for supercell thunderstorms and tornadoes early in this thunderstorm event, but cells will likely transition into a powerful convective system by mid to late evening. Given the potency of the thunderstorm environment tomorrow, all modes of severe weather will be possible, including very large hail and destructive winds. If your travels take you into this region today, you’ll want to pay close attention to the latest weather watches and warnings in the area.
Tuesday
Tuesday will be a relatively benign day. Temperatures will once again be in the mid twenties. Precipitation is unlikely as a surface high pressure system builds into Manitoba. Winds will be relatively light and from the north.
Wednesday
The surface high from Tuesday looks to stick around for Wednesday, bringing continued pleasant weather to southern Manitoba. Temperatures look to be in the mid to upper twenties with light winds. Some precipitation may edge into western Manitoba late in the day as thunderstorms are potentially triggered to our west in Saskatchewan.
Long Range
The long range forecast looks to have ups and downs. Models strongly suggest that a low pressure system will move into Manitoba late this week, potentially bringing us some rain and generally unsettled conditions. Once that system exits the region we’ll likely return to more summer-like weather next week.
