At this time, the northern supercell (moving through northern Marshall County) is beginning to rapidly strengthen.  At the same time,  the storm near Pella is extremely strong and likely doing significant damage, and could be taking the bulk of the attention of the forecasters.  Here, both the NMDA and NTDA have correctly identified the strengthening of the northern storm.  I think the algorithms could have been helpful in bringing attention back to the Marshall County supercell before it became any stronger.  This situation (two storms, one very strong and damaging while the other is rapidly strengthening) could be a “high risk” situation for loss of SA. This is especially the case on a day like this, when the overall situation was not well anticipated, and officing staffing is likely not at the level it would ideally be for such a set up.

– Rabbit