This evening's sounding developed from the Shreveport National Weather Service's weather balloon data and drawn on a skew-t/log-p diagram by www.rap.ucar.edu shows a fairly unstable atmosphere early this evening. The sounding shape concludes what was already occurring across the ArkLaTex at the time-isolated to widely scattered air mass type showers and a couple of storms.

CAPE or storm energy (the area between the temperature line and the moist adiabat) was sufficient enough for convection in a low shear or negligible spin environment. Here, storms would only be pulse type with up and downdrafts having little separation. Thus, once rain would fall, the cool accompaning the precipitation would cut off the energy supply to the convection and the storms would die off. More convection would form randomly on outflow boundaries.

Storm intensity was kept down due to the dry nature of the air column or the graph showing a gap between the temperature and dew point lines. With these lines touching, we would have saturation. Over 5 degrees C apart and higher, we start to see drying like this evening.

Finally, the LCL or lifting condensation level where lift would get convection going and the CCL or Convective Condensation Level where the temperature could induce convection were the same. So, showers/storms developed in the 90 plus F heat and more formed randomly from outflow boundaries.

With temperatures cooling after sunset this evening, CAPE is going down with the inversion layer forming. So, CINH or negative energy with the inversion should keep any more showers/storms from developing even on outflow boundaries until tomorrow afternoon.

Have a good night.