This image shows the current jet stream patterns throughout continental US. Note the southeastern direction of travel of the jet stream across Wisconsin. This jet stream is bringing a colder cP airmass over our area.

This Image shows the weekly pressure trends for our area. As you can see Monday's barometer reading was very low resulting in a warm and dry air temp. The pressure reading rise dramatically in a short amount of time causing a 20+ degree F difference in air temperature between Monday and Tuesday.