A tornado was observed via news footage near Mangum, OK.  The formation of this tornado was associated with an increase in CPTI for strong tornadoes to 46%:

The CPTI for violent tornadoes also increased to near 6% (not shown).

The ProbTor on this storm increased markedly between 2140-2155 UTC:

This increase was driven by an increase in AzShear:

Ron Dayne