The Pembina and Red River Valleys as well as Southeastern Manitoba are in line for the two hottest days of the Summer so far Tuesday and Wednesday, and that may lead to another round or severe thunderstorm activity over the two days.

Environment Canada has issued a Special Weather statement for those regions of the province, indicating a warm front pushing into the region will bring the hot, humid air mass into the province. Temperatures will climb into the 30 to 33°C both days, and humidex values will reach the mid- to upper-30s as the humidity

These marigolds in Sumner's flower garden are loving this week's heat increases.

"With this stretch of hot, muggy weather beginning Monday in these areas, it's a good reminder about the importance of staying hydrated, wearing sunscreen and taking frequent breaks if you are working outdoors," explains CMOS Accredited Weathercaster Chris Sumner, who notes there will only be a slight reprieve Tuesday night with temperatures remaining in the 20s in the Pembina and Red River Valleys.

According to the Special Weather Statement, a breezy southerly wind combined with the hot and humid air mass will keep temperatures very warm through the night. In the Red River Valley, temperatures will likely only drop to 23 or 24°C, while areas in Southeastern Manitoba will see temperatures dip a couple degrees cooler.

A cold front will move through the province on Wednesday night, bringing a return to more seasonal temperatures and humidity, and that's where Sumner is placing the heaviest focus for severe thunderstorm activity. He adds severe storms are also a possibility Tuesday evening, with the highest risk in the southwestern part of the province, and then dropping off eastward.

"It's a Southern Manitoba summer right of passage, hot and humid conditions followed by stormy weather," says Sumner. "The issue is the timing, and how closely it follows the 5 to 10 inches of rain which fell in the R.M.'s of Stuartburn and Piney about a week ago."

Environment Canada says the humid conditions will support very heavy rainfall with some thunderstorms that develop, and the potential is there for southeastern areas to see even more torrential rainfall. On Wednesday, the region could see narrow bands of training thunderstorms resulting in significant rainfall accumulation.

"Training thunderstorms, or storms that move over the same area over and over again, are exactly what happened last weekend, and led to the absolutely deluge of rainfall parts of the Southeast received," adds Sumner. "That would be the absolute worst case scenario for those municipalities still dealing with overland flooding from the first round."