Hereâs why I chose the NASM certification! Did you need any sort of background related to the field going into the program? Nope, you just need to make sure that you have a current CPR and AED certification before you take the exam. How long does your certification last before you have to renew it?
Tornado Warning. This is issued when a tornado is indicated by the WSR-88D radar or sighted by spotters; therefore, people in the affected area should seek safe shelter immediately. They can be issued without a Tornado Watch being already in effect. They are usually issued for a duration of around 30 minutes.
Thunderstorms. Because tornadoes often accompany thunderstorms, pay close attention to changing weather conditions when there is a severe thunderstorm watch or warning. A severe thunderstorm watch means severe thunderstorms are possible in your area.A severe thunderstorm warning means severe thunderstorms are occurring in your area.now how to distinguish between the siren's warnings for a tornado watch and a tornado warning. A tornado watch is issued when weather conditions favor the formation of tornadoes, for example, during a severe thunderstorm.