This is Severe Weather Preparedness Week in several states. Others may have just observed the week and still others may be doing so soon. Over the next several posts, we’ll cover several topics related to severe weather in greater depth.
As outdoor baseball and soccer practice, along other activities such as golf, gardening, boating will be on the upswing in coming weeks, we’ll start our coverage with lightning. Of course, the threat of being struck by lightning has been known for centuries. The History Channel recounts a particularly devastating lightning strike that killed 300 people.
The National Weather Service has a very good lightning resource page including actions you should take to protect yourself and others.
As our understanding of how lightning works, the different kinds of lightning and other aspects of the science involved improves, best practices have been refined and much more attention is being given to protecting participants and fans at outdoor sporting events.
The National Collegiate Athletic Association (NCAA) has developed some guidelines for when to clear the practice field and when to ask fans to leave a stadium. Some institutions have modified these to be even more conservative based on estimates of how long it would take to empty a stadium of fans and where the closest safer shelter is. During the 2014 football season lightning delays and even suspensions were fairly common.
Many states require the installation of lightning alarms at recreational facilities and sports venues. Participants and fans should follow the local guidelines when those alarms are triggered. However, as always, alarms are never a substitute for personal responsibility. There are a variety of smartphone apps that link to databases of recent lightning strikes. They can be a good tool, but be aware that there may be a delay in the process of detecting the strikes, assembling the data and posting in the app. So it is best to assume that the data may be a few minutes old and act accordingly.
As mentioned in the content in the links above, a good rule of thumb is that a 30-second lag between sighting the lightning bolt and hearing the thunder means the bolt was roughly six miles away. And at six miles, you should be headed to a safer place immediately.
Additional resources from eXtension.org are good reads.