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.
Best Answer: You are correct that a tornado has likely been sighted in the area for the sirens to be activated. How large an area this covers, really depends. The tornado warnings that you receive on the television or radio usually mean that the conditions are forming in the area for a tornado to occur at any time.