While nighttime tornadoes are rare, there's a chance you may never know they're happening because there are no tornado sirens in California.
The storm is blowing in. This round bringing strong wind and frigid air
Rain, wind, thunderstorms---and even a chance of a tornado overnight.
An overnight tornado is unusual--but not unprecedented.
The freezing temperature of the air in this system is so cold it's creating the instability that makes a tornado touchdown possible.
Now there's a chance for this system to do tornado damage overnight, but it's not something that would cause substantial damage to a house or anything like that.