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.
The Speed Limit Warning sign (W13-1) may be used to supplement any warning sign to indicate the advisory speed for a condition. Speed limits should be in multiples of 5 mph. 18 x 18 Engineer grade or high intensity reflective vinyl on .080 aluminum. Speed Limit Warning Sign 24x24