Once you"ve spread out, use the lightning crouch; put your feet together, squat down, tuck your head, and cover your ears. When the immediate threat of lightning has passed, continue heading to the safest spot possible.
Look for a dry, low-lying area such as a valley and become the smallest target possible. Do this by crouching down with your heels touching, head between the knees, and ears covered. Minimize your contact with the ground and do not lie down flat.
Shouldn"t I lie flat on the ground to get as low as possible? NO! Lying flat on the ground was once thought to be the best course of action, but this advice is now decades out of date. When lightning strikes the earth, it induces currents in the ground that can be fatal up to 100 feet away. These currents fan out from the strike center in a tendril pattern, so in order to minimize your chance of being struck, you have to minimize BOTH your height AND your body"s contact with the earth"s surface. Top
How do I avoid having to use the Lightning Crouch? We don"t recommend the crouch because it will not significantly lower your risk of being killed or injured from a nearby lightning strike. Be aware of your situation and PLAN AHEAD. If you going to be involved in an outdoor activity, make sure you know what the forecast is, ESPECIALLY if you live in a lightning prone area. If storms are forecast, have a plan of action that you can enact quickly to reduce your chances of being struck. Top
NOAA的另一個網站（NWS Lightning Science Home Page）上，解釋了不推薦雷蹲的原因：
The National Weather Service (NWS) stopped recommending the crouch in 2008. Why? The crouch simply doesn"t provide a significant level of protection. Whether you"re standing or in the crouch position, if a lightning channel approaches from directly overhead (or very nearly so), you"re very likely to be struck and either killed or injured by the lightning strike.
Never wait for imminent signs of a lightning strike. If your hair stands on end or you feel a tingling sensation, there may not be anything you can do to prevent a fatal lightning strike. If this happens to you, run as fast as you can to a safe place.
Rather than "what to do in a dangerous situation" NWS focuses on "what to do so you don"t get into a dangerous situation," and, "if you do find yourself in a dangerous situation, how to get out of the dangerous situation."
Event organizers should know how long it will take to get people to safe shelter.
組織者需要了解將人們帶到安全遮蔽物所需要的時間。
當然老美自己都說了：
Lightning is one of the most capricious and unpredictable characteristics of a thunderstorm. Because of this, no one can guarantee an individual or group absolute protection from lightning.
The safest location during a thunderstorm is inside a large enclosed structure with plumbing and electrical wiring. These include shopping centers, schools, office buildings, and private residences.
If lightning strikes the building, the plumbing and wiring will conduct the electricity more efficiently than a human body. If no buildings are available, then an enclosed metal vehicle such as an automobile, van, or school bus makes a decent alternative.
Lightning can travel great distances through power lines, especially in rural areas. Do not use electrical appliances, ESPECIALLY corded telephones unless it is an emergency (cordless and cell phones are safe to use). Computers are also dangerous as they usually are connected to both phone and electrical cords. Do not take a shower or bath or use a hot tub.
Remember this lightning safety rule...When thunder roars, go indoors and stay there until 30 minutes after the last clap of thunder. 以及 Do not resume outdoor activities until 30 minutes after the last thunder clap.
總之就是在最後一次雷擊過去半小時之內，仍需保持避雷狀態。
附簡單計演算法則：
Remember the "Flash to Bang" method to estimate lightning from your location - If you see lightning, count the number of seconds until you hear thunder. Divide the number of seconds by five to get the distance the lightning is away from you. For example, if you see lightning and it takes 10 seconds before you hear the thunder, then the lightning is 2 miles away from you (10 divided by 5 = 2 miles, too close!).
