You can change it to 20/100k if you wish, it doesn't really make a difference.
SD case counts per 1M on selected dates:
Jul 15 2020 - 463
Aug 15 2020 - 725
Sep 15 2020 - ~1800
Doubling in a month seems like a spike to me.
SD case counts per 1M on selected dates:
Jul 15 2020 - 463
Aug 15 2020 - 725
Sep 15 2020 - ~1800
Doubling in a month seems like a spike to me.
I'm not going to say definitively what caused what here, but your anecdotal recollection of what happened in SD is not really supported by the numbers.