The above visible satellite image was taken just a few moments ago. The area of "bubbling" cloudiness (within the yellow circle) over northeast Iowa and southwest Wisconsin indicates the arrival of energy in the middle and upper levels of the atmosphere. This energy will aid thunderstorm development along and ahead of the cold front / dryline (solid blue line on the image above) over southeast and east-central Minnesota into northeast and east-central Iowa during the next couple of hours.
Once developed, thunderstorms will rapidly become severe and move / develop toward the East/Northeast into much of Wisconsin and northern Illinois. Large hail, damaging winds and tornadoes are possible with these storms. A few of the tornadoes that form as the storms mature are likely to be strong and/or long track.
I would expect a Tornado Watch to be issued for the above region soon...
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