Caught between the two systems is the Midwest (click for 12 hour loop)

September 19, 2007
2030z
UNISYS Water Vapor Satellite of USA (click here for 12 hour loop)

There is a vortex over Hudson Bay driving the central continent system.

September 17, 2007

2031z

UNISYS Enhanced Infrared Satellite (click above, thank you)