Scanner antenna on the car window? -- here is something to think about

This news item appeared in today’s Milwaukee Journal Sentinel:

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Lightning hits truck, injuring passenger

A passenger in a semitrailer truck that was struck by lightning shortly before 2:30 p.m. Wednesday was taken to Community Memorial Hospital in Menomonee Falls with minor injuries, Police Chief Peter Hoell said.

The truck, which was carrying scrap metal, was parked at a stop sign at Maple Road and Bunsen Drive in the Germantown Industrial Park, Hoell said. The driver was not hurt, he said.

The lightning struck a citizens band radio antenna attached to the passenger side mirror. The truck had to be towed from the scene.

### The following is from the NWS training for storm spotters:

Safe Buildings

A safe building is one that is fully enclosed with a roof, walls and floor, such as a home, school, office building or a shopping center. Even inside, you should take precautions. Picnic shelters, dugouts, sheds and other partially open or small structures are NOT safe.

Enclosed buildings are safe because of wiring and plumbing. If lightning strikes these types of buildings, or an outside telephone pole, the electrical current from the flash will typically travel through the wiring or the plumbing into the ground. This is why you should stay away from showers, sinks, hot tubs, etc., and electronic equipment such as TVs, radios, and computers.

Lightning can damage or destroy electronics so it’s important to have a proper lightning protection system connected to your electronic equipment.

Safe Vehicle

A safe vehicle is a hard-topped car, SUV, minivan, bus, tractor, etc. (soft-topped convertibles are not safe) . If you seek shelter in your vehicle, make sure all doors are closed and windows rolled up. Do not touch any metal surfaces.

If you’re driving when a thunderstorm starts, pull off the roadway. A lightning flash hitting the vehicle could startle you and cause temporary blindness, especially at night.

Do not use electronic devices such as HAM radios during a thunderstorm. Lightning striking the vehicle, especially the antennas, could cause serious injury if you are talking on the radio or holding the microphone at the time of the flash. Emergency

If the weather is forecasting the possibility of Thunderstorms, I usually unplug my computer from my phone line, unplug it from the electrical socket, and shut it off…A neighbor of mine fried his computer one time when lightning struck a powerline in front of his house and the power surge ran through the line and into his home’s wiring.

Yeah, unfortunately you’re at risk no matter what… Whether you have an antenna on the car or not. But I would much rather be in a car with an antenna, than out in it with nothing… That’s when you’re at the greatest risk. I was driving through Kansas one time during a bad electrical storm, and then it dawned on me that it’s so flat around there, you’re basically the tallest thing around for miles. Kind of unnerving.

You can also have electrical damage done by simply having a strike at a fair distance. It doesn’t even have to be direct. Just the static can fry stuff.

Dave
http://www.dpdproductions.com

  • Featuring the TrainTenna Railroad Radio Antennas -

I recall reading about a guy at a power management facility in CA who happened to be on the phone with a counterpart in MT. The CA guy asked the MT guy if they’d just had a lightning strike on the lines, to which the reply was yes. They’d seen the spike, however muted by distance, in CA.

While you’re unplugging the computer, don’t forget the telephone line for the modem, or even the cable for your high-speed connection. And all of the other devices (printers, external hard drives, scanners, etc) that are also plugged into the wall. A hit on the power line can make its way through them to the computer, too. Having a good surge protecter is a good idea, but not a guarantee of protection, no matter what the manufacturers say.