The Brief Extreme heat and humidity is expected across the Twin Cities and southern Minnesota starting Saturday afternoon. It'll be a hot and sticky weekend across the Twin Cities metro as heat and humidity ramp up and weather warnings take effect. Hot and humid Saturday aheadLocal perspective:Dew points will stay high through Saturday and Sunday, making it feel especially muggy. Extreme heat warnings will be in effect starting Saturday afternoon for the Twin Cities and southern Minnesota, highlighted in pink on weather maps. Surrounding areas are under a heat advisory, and the National Weather Service may upgrade some advisories to warnings if conditions worsen.