We issued our 1st SVR at 2246Z. This decision was based on a combination of basic base data interrogation. Solid core of 50dbz with 65+dbz at 0.5 degrees. Dual-Pol showed signs of a TBSS in ZDR and CC radially behind the core.

In terms of experimental tools we noticed the Sigma Jump of 2 at 2237Z, then next scan showed an 11 Sigma. This can be seen in the gif loop below.

Figure: Gif Loop of reflectivity and Sigma for lightning

Fig 2: Plot of the the ENI lightning jump near the time of the warning.

It is interesting to note that the ENI lightning jump plot showed this rapid jump as well (fig 2). At this time the rapid jump could have also demonstrated a cell merger in conjunction with intensification of the southern cell which also demonstrated a low level mesocyclone along with a POSH/POH of 80/100 and MESH of 1.25″ (fig 3).

Fig 3: 2246Z, Low level circulation and hail indicator on the HC plot.

Forecasters: Cattywampus/CoonieCatEye