會訊(第二十三期)
出版日期： 二○○五年九月一日
會員來稿
出版日期： 二○○五年九月一日
會員來稿
電郵Email：club@qqclub.org 電 傳Fax：(852) 2835 7777
34 Oi Kwan Road, Wanchai, Hong Kong
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會訊(第二十三期)
出版日期： 二○○五年九月一日 會員來稿 |
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| 香港灣仔愛群道34號 電
話Phone：(852) 2574 4296 電郵Email：club@qqclub.org 電 傳Fax：(852) 2835 7777 34 Oi Kwan Road, Wanchai, Hong Kong |
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How Far Away Is Lightning From Me? |
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| US NWS |
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The ‘30-30 rule’ offers the best lightning safety guidance for the
general public. When you see lightning, count the time until you hear
thunder. If that is 30 seconds or less, the thunderstorm is close
enough to be dangerous – seek shelter (if you can’t see the lightning,
just hearing the thunder is a good back-up rule). Wait 30 minutes or
more after the lightning flash before leaving shelter. To
estimate the distance between you and a lightning flash, use the "Flash
to Bang" method: If you observe lightning, count the number of seconds
until you hear thunder. Divide the number of seconds by five to get the
distance in miles. 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).
For more information of lightning safety, please visit US National Weather Service webpage: http://www.lightningsafety.noaa.gov/more.htm |
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