SACRAMENTO, Calif. (AP) — A staggering rise in coronavirus cases could overwhelm California’s health system within weeks.

Gov. Gavin Newsom is warning that “drastic” action such as a widespread stay-at-home order may be needed to combat the threat. Newsom on Monday said “red flags are flying.”

Hospitalizations from COVID-19 have increased nearly 90% and officials say they could triple by Christmas, overwhelming intensive care units.

Public health officials say people who ignored safety measures to gather for Thanksgiving could lead to a massive surge in cases by Christmas.

WATCH: Los Angeles County is already under a stay-at-home order. Here’s how it’s been going

Authorities say about 12% of those who are infected could wind up in the hospital.

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