COVID19 US Daily Cases - Log Scale with Control Chart

Log scale shows when the earlier cases from February occurred they broke higher than the 2 Standard Deviation Upper Bollinger Band with over 30 cases.
This may have been the “First Wave” of cases brought in from overseas.
These early cases may have already formed clusters, and what we are seeing happening today is a “Second Wave” of clusters & mega clusters that have spawned since then.

There’s a great explanation and study shown here from Japan:
youtu.be/H2azcn7MqOU
Breadth IndicatorsCoronavirus (COVID-19)covid-2019Moving AveragesTrend Analysis

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