Extreme cold warnings in effect, with bone-chilling lows and wind chills below -20°F. The cold spell is expected to linger into early February, with multiple Arctic air masses moving through. A polar vortex is dumping Arctic air straight into the Ohio Valley, and Cincinnati is right in the crosshairs. Extreme Cold Warnings Are No JokeThe National Weather Service has Extreme Cold Warnings posted through at least early next week. Multiple shots of Arctic air could keep rolling through, so this isn’t a quick hit-and-run.