As of today this event seems to be ending. The eastern secondary core at Meridiani Sinus and more prominent western ones at or near Solis L. did not last long; for a time there was a bit of atmospheric dust raised in Hellas. The area around Argyre is still bright, but its lack of daily movement suggests it is now dust fallout from the storm. This area is larger than Argyre, as was the case with the similar event in 2022. Compared with the 2020 and 2022 regional storms at similar seasonal dates, the present one was less energetic and less extensive.
I will write an illustrated account of this regional storm for the Mars Section 2024 blog later, but will not submit further posts here, unless something striking or unexpected happens. Thanks to all those who sent observations.