Know the difference between a tornado watch and a tornado warning:
Tornado Watch – Tornadoes are possible in and near the watch area. Review and discuss your emergency plans, and check supplies and your safe room. Be ready to act quickly if a warning is issued or you suspect a tornado is approaching. Acting early helps to save lives!
Tornado Warning – A tornado has been sighted or indicated by weather radar. Tornado warnings indicate imminent danger to life and property. Go immediately under ground to a basement, storm cellar or an interior room (closet, hallway or bathroom).
Article source: http://www.redcross.org/get-help/prepare-for-emergencies/types-of-emergencies/tornado#/About
