vortexThe first part of this week will feel more like September than the middle of July, typically the hottest time of year, throughout the Midwest. The unseasonably cool air is arriving via a piece of the polar vortex. That does not mean that kids across the Midwest will be trading their swimming gear for sled and skis. As AccuWeather.com Senior Meteorologist Alex Sosnowski first reported last week, this is a summertime version of the polar vortex that has broken off from the Arctic and is dropping southward. The advancing cooler air will help trigger severe thunderstorms across the Ohio and Tennessee valleys through Monday. More