A couple of observations regarding this apparently long lived tornado/tornadic supercell.
First NWS has confirmed a strong to violent tornado is occurring.
Second, the G2G shear and hook are remiscent of the big tornado outbreak in MO a few weeks ago.
Third, this tornado, if on the ground the whole time, would be another tri-state tornado as it is in AR NOW, going to move into MO very soon, and then into Northwestern TN shortly after that. Of course, assuming it stays tornadic the whole time.
PS: There is little doubt in my mind that this AR storm is producing a wedge tornado right now...certainly much larger and more violent than the Springfield, IL storm.
EDIT: From NWS..."AT 618 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR AND LAW
ENFORCEMENT WERE TRACKING A LARGE AND EXTREMELY DANGEROUS TORNADO.
THIS TORNADO IS NOW LOCATED NEAR COUNTY ROAD 437 IN MARMADUKE...MOVING EAST AT 45 MPH. HEAVY DAMAGE HAS BEEN REPORTED IN MARMADUKE BY LOCAL LAW ENFORCEMENT."