What a hot and humid afternoon, well, oppressive is a better way of putting it. Heat index values jumped well into the 90s and lower 100s. Most of the area didn't see a single drop of rain; however, that wasn't the case for everybody. An outflow boundary from leftover morning convection provided the focus for showers and storms, mainly south of I-40. This boundary, along with CAPE values close to 5,000, sparked afternoon showers and storms capable of quarter size hail and heavy rainfall.

This is a visible satellite picture where the red line denotes the outflow boundary. Notice the cumulus line along the boundary.

Here are pictures from 40/29 storm chaser Brian Emfinger. These are impressive anvil pictures from the storms near Mena and Alma. These storms don't tend to move very fast since the upper level winds are rather light.