Tag Archives: thunderstorm

Do you really understand the danger of lightning?

lightning
PC: Mr. Shane Lear, Orange Australia. Creative Commons

We had a doozy of a lightning show in Fort Wayne tonight. Fortunately, it appears (at the time of this writing) that our immediate area sustained no significant storm damage. But tonight’s storm — and the way I saw people react to it — prompts me to share some life-or-death information about lightning.

All thunderstorms — including those that aren’t technically severe — produce lightning and are therefore dangerous.

Lightning kills

As of  this date, lightning has killed at least 15 people in the United States so far this year, according to National Weather Service (NWS) statistics.  They ranged in age from seven to 75. Three of the victims were women, The rest were men and a boy. Many were doing some kind of gardening, like mowing, tree trimming, etc. All had one thing in common; they were outdoors when lightning struck.

Needless deaths

Making these statistics even sadder is the fact that most lightning deaths are preventable. Rarely does a lightning bolt strike a person without lightning (and its accompanying thunder) first occurring some distance away. That’s why the NWS came up with the slogans, “when thunder roars, go indoors” and “see a flash, dash inside.” Many people who were killed by lightning simply didn’t seek appropriate shelter soon enough.

Important lightning facts

All thunderstorms — including those that aren’t technically severe — produce lightning and are therefore dangerous. So many thunderstorms happen every year that the NWS issues warnings only for those that it expects to produce damaging winds or gusts of at least 58 mph and/or hail of one inch or more in diameter. No matter how much lightning a storm produces, if it doesn’t have strong enough winds or big enough hail, it doesn’t get a severe thunderstorm warning. Nonetheless, it’s potentially deadly, because of its lightning.

Lightning can strike even if it’s not raining. In fact, it can strike as far as 10 miles from any rainfall.

If you can hear thunder, therefore, you are in danger, unless you are already in an appropriate shelter (see below).

Avoiding lightning strikes

Staying alive in a thunderstorm is relatively simple, according to an NWS brochure. If you hear thunder, even a distant rumble, seek safety immediately. Fully enclosed buildings with wiring and plumbing are best.

A hard-topped metal vehicle with the windows closed is also safe.

Sheds, picnic shelters, tents or covered porches do not protect you from lightning.

Stay inside until 30 minutes after the last rumble of thunder.

If you are at a sporting event and venue officials recommend taking shelter, do it. Many venues have access to lightning data and suspend competition and advise sheltering when the first strike is detected within a certain number of miles of the venue. Such policies, when heeded, help give spectators and participants adequate time to reach appropriate shelter.

Spread the word

Help stop needless lightning deaths by making sure your family and friends understand the danger and what to do. Share this helpful NWS website and/or one or more of the resources to which it links.

 

Remembering a lesson on a derecho anniversary

An NWS graphic showing the path of the 2012 derecho

Today is the fifth anniversary of a “derecho” thunderstorm that did widespread damage in northern Indiana and locations to the southeast.

“At the peak of the event,” writes the northern Indiana office of the National Weather Service, “the Fort Wayne International Airport observing equipment observed a peak wind gust of 91 mph.”

“Winds were as strong as an EF-1 tornado over a widespread area,” the NWS web page continues, “which resulted in immense damage along the storm’s entire path.” (Emphasis added by W9LW.)

One of the best lessons of that storm should be that we can have massive damage without a tornado. This was a particularly dangerous severe thunderstorm, but there’s no such thing as a “particularly dangerous situation” thunderstorm warning, so we need to pay attention to all severe thunderstorm warnings, even though such warnings are not uncommon.

See an extensive discussion of the 2012 derecho on the NWS northern Indiana website: https://www.weather.gov/iwx/20120629_derecho