https://www.solen.info/solar/
"December 7: An asymmetric full halo CME was observed after a C7.4 in AR 12790 at 16:32 UT. The CME could reach Earth on December 10 and cause unsettled to minor storm conditions."
Forecast
"The geomagnetic field is expected to be quiet to unsettled on December 9 due to effects from CH981. Unsettled to major storm conditions are possible on December 10-11 due to CME effects."
Effects from a CME are likely to be observed on Earth within 96 hours.