The sun has been very active this year. According to space.com, a solar flare in August was the strongest seen in four years.
- Live look at NorCal: San Francisco, Oakland, SJ & more
- Data shows every Bay Area county's COVID-19 status
- How to register for a COVID-19 vaccine in every Bay Area county
- CA COVID-19 vaccine tracker: See your status here
- No more CA counties left in purple tier
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