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 National Weather Service will issue a warning or advisory when lives or property are threatened by building weather conditions. There are various advisories and warnings issued throughout the winter season, but do people really know what they mean? The NWS will issue a warning when a hazardous weather or hydrologic event is occurring, imminent, or has a high probability of occurring. An advisory highlights special weather conditions that may cause significant inconvenience.