Meteorologists are urging people to keep an eye on the sky Sunday as the threat for severe weather increases throughout the day.
An energetic jet stream dip may trigger flooding rains and some severe thunderstorms, which could produce tornadoes, in parts of the Midwest, including Minnesota, The Weather Channel says.
The red area on the map below indicates the areas with the best chance of severe thunderstorms, while the orange area could see thunderstorms, but have a minimal threat of severe weather.
Morning storms are expected to dry up, but then redevelop in the late afternoon and evening. The National Weather Service in the Twin Cities says thunderstorms are expected to move across east central Minnesota, including the Twin Cities, between 3 p.m. and 7 p.m.
These storms have the potential to be severe, which includes the chance for damaging winds, hail and the possibility of a few tornadoes, especially south of the Minnesota River Valley near the Iowa border, the weather service says.
"These storms will be accompanied by dangerous straight-line winds to 70 mph, large hail up to the size of tennis balls, and a few isolated tornadoes," AccuWeather meteorologist Andrew Crouch said.
Locally heavy rainfall is also expected, and could total 1.5 to 2 inches.
The weather service in Duluth says the cold front will bring gusty winds to northern Minnesota, which could produce hazardous conditions for inexperienced swimmers along Park Point Beach in Duluth.
Storms could linger into Labor Day, the weather service notes. Meteorologist Paul Douglas wrote on the Star Tribune's weather blog that "Labor Day gets off to a damp start, but the sun comes out by midday. ... Not bad for a holiday."
Cooler, drier air is expected Monday, which means a "pleasant day to close out the State Fair," according to MPR News' Updraft blog. Highs are expected to be in the upper 70s for the Twin Cities.