Some lightning originates in the top of the thunderstorm, the area carrying a large positive charge. Lightning from this area is called positive lightning. Positive lightning is particularly dangerous, because it frequently strikes away from the rain core, either ahead or behind the thunderstorm. It can strike as far as 5 or 10 miles 8 or 16 kilometers from the storm, in areas that most people do not consider to be a lightning-risk area.
The determining factor on whether a particular flash could be deadly depends on whether a person is in the path of the lightning discharge. Although some victims are struck directly by the main lightning stroke, many victims are struck as the current moves in and along the ground.
Seek shelter and avoid situations in which you may be vulnerable. When you see lightning, count the time until you hear thunder. If that time is 30 seconds or less, the thunderstorm is within six miles ten kilometers of you and is dangerous. Seek shelter immediately.
The threat of lightning continues for a much longer period than most people realize. Wait at least 30 minutes after the last clap of thunder before leaving shelter. Don't be fooled by sunshine or blue sky! People involved in activities such as boating, swimming, fishing, bicycling, golfing, jogging, walking, hiking, camping, or working outdoors all need to take the appropriate actions in a timely manner when thunderstorms approach.
In summer, especially on a holiday, more people are outside, on the beach, golf course, mountains, or ball fields. Outdoor jobs such as construction and agriculture, and outdoor chores such as lawn mowing or house painting are at their peak, putting people involved in danger. Swimming is particularly dangerous, as not only do swimmers protrude from the water, presenting a potential channel for electrical discharge, but also because water is a good conductor of electricity.
As with the outdoor activities, these activities should be avoided before, during, and after storms. Most people hurt by lightning while inside their homes are talking on the telephone at the time. Surge protectors do not protect against direct lightning strikes. Unplug equipment such as computers and televisions. Cardiac arrest and irregularities, burns, and nerve damage are common in cases where people are struck by lightning.
However, with proper treatment, including CPR if necessary, most victims survive a lightning strike, although the long-term effects on their lives and the lives of family members can be devastating. For a shelter to provide protection from lightning, it must contain a mechanism for conducting the electrical current from the point of contact to the ground. About 20 million lightning strikes hit the United States each year say scientists at Harvard University.
Thunder occurs as an acoustical effect of high temperature and pressure during a lightning storm. The change in pressure affects the human ears, which is how thunder is heard.
The highest pressure in a storm happens a few inches away from the origin of the lightning strike, causing a rumbling noise. The pressure which results in thunder doesn't just have acoustical effects but mechanical ones as well. The high pressure of these lightning strikes can cause earthly damage, especially to metal objects. The pressure can be even more destructive when lightning strikes a small, closed area, such as a crack in a wall or a capillary in a tree.
When pressure gets high enough and passes through tree capillary, the tree can explode. BI India Bureau. It is a common belief that lightning strikes are a death sentence. But that is not entirely true. However, the victims rarely walked unscathed and the damage can be permanent. Did you know? Also minor thermal burns and nervous system damage can occur through an indirect strike, where the body is only exposed to a fraction of the energy of the lightning.
Griggs says. Griggs says to call immediately. After someone is struck by lightning — unless there is still an immediate weather danger — they pose no threat to responders. If a group of people are struck by lightning — a mass casualty event — and you are trained in CPR, Dr.
Griggs says to begin resuscitating first those who appear dead. In a mass casualty event, medical professionals usually prioritize the living first, since resources are scarce.
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