野外遇上雷雨，钻进有硬顶的车或建筑，避开山脊、孤树、水面和金属

不花钱。代价是行程被打断半小时以上。难的是雷声还远的时候就肯往回走。

雷暴范围内的户外没有安全的地方。最后一声雷响过 30 分钟，才算安全

美国国家气象局. 户外雷电安全：「There is no safe place outside when thunderstorms are in the area」「Avoid open fields, the top of a hill or a ridge top. Stay away from tall, isolated trees or other tall objects」「Stay away from water, wet items, such as ropes, and metal objects, such as fences and poles」；实在走不了时「If you are in a group, spread out to avoid the current traveling between group members」；恢复活动「Wait 30 minutes until after the last rumble of thunder」. https://www.weather.gov/safety/lightning-outdoors

帐篷、凉亭、树下、岩石突出部都不算掩体。硬顶汽车算，敞篷车和摩托不算。听见雷就开始撤，不要等雨下下来。