3-hr pressure tendencies would be interesting, but I can guess from the precip and secondary circulation north of Topeka that the major forcing is northeast of the surface low east of Wichita and that the system is bombing and translating rapidly northeast at 40 knots or more. I'd definitely see this as a triple-point play and be targeting a fifty mile circle centered on Kansas City. Since the storms should be moving northeast very fast for chasing purposes I'd be at the junction of I-35 and I-435 near Pleasant Valley, MO. I'm noting that the SPC is progging the large Moderate Risk area eastward, suggesting that this could continue as a nocturnal outbreak after the system consolidates in northern MO.
The secondary area of interest is at the tail-end where there seems to be plenty of shear and tons of moisture -- a triangle formed by Sherman, Paris, and Greenville, TX, at the bottom of the map. FWIW.