You can leave work during a tornado warning if it's safe to do so.
Employers, cannot force an employee to stay at work during or due to severe weather, including tornado warnings or tornado watches.
Employers should also inform employees about the potential safety risks and take precautions to ensure that they are also minimizing all hazards.
It can be dangerous to leave work during a tornado warning as getting out during the tornado warning could put you at risk of getting into the tornado on your way home from work.
If at work during a tornado warning you should seek immediate shelter a designated safe area as per the OSHA requirements.
The employer though cannot force you as an employee to remain at work against your will, and employees can refuse to work if they believe the conditions are unsafe.
Don't wait until you can see or hear the tornado before seeking shelter.
Instead move immediately to the pre designated safe area within the building.
If there's no safe area, then protect your head and neck with your arms and take shelter in a low lying area away from any windows or other glass.