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What are the chances of being struck by lightning?
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InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.
This article summarizes the basic risks of lighting strikes or being struck by lightning and cites opinions on what to do to
reduce the chances of personal injury by lightning during a storm.
This article series describes common lightning protection systems, certification, installation, and lightning protection system inspection.
We provide information about lightning strikes, lightning hazards, related equipment, sources of lightning protection system installers, and lightning strike risk assessment
© Copyright 2012 InspectAPedia.com, All Rights Reserved. Use page top links to major topics or use links at the left of each page to navigate within topics and documents at this website. Green links show where you are in a document series or at this website.
Lightning Strike Risk Assessment
Lightning strikes are the most dangerous, and most often observed weather hazard people see. (Floods kill more people in the U.S.
each year than lightning.) Since about 1977, about 73 people a year have died in the U.S. due to lightning strikes. It may surprise
some readers however to learn that while you're not so likely to die (10% of people hit by lightning die), you are likely to
have long term neurological damage including brain functions such as short term memory loss and handling of new incoming
information. Other long term complaints include headaches, dizziness, numbness, pain, fatigue, irritability, and similar
behavior changes.
"The magnitude of the cloud-to-ground lightning hazard is understood better today than had been the case due in
large part to data collected by the U.S. National Lightning Detection Network TM (NLDN) described by Holle and Lopez
(1994) and Cummins et al. (1998). From 1992 to 1995, the NLDN identified an average of 21,746,000 cloud-to-ground
flashes per year (Orville and Silver 1997).
Lightning occurs in the U.S. every day in summer, and nearly every day
during the rest of the year. At any time there are about 1800 active lightning storms on earth, and in the U.S. where
lightning strikes are monitored, about 25,000,000 lightning groundstrokes are recorded annually.
Since lightning strikes the ground in such large numbers and is so widespread, it is not
possible to warn each person for every flash.
For this reason, lightning can be considered the most dangerous weather
hazard that many people encounter each year. Lightning-specific warnings have proven effective in some unique
applications, such as at the Kennedy Space Center and during major golf tournaments."
"Although the scientific
understanding of lightning has advanced significantly in the last few decades (Krider 1996), a consistent match between
basic science and applications to safety had not been made.
For example, NOAA (1992) said to squat on the balls of your
feet and minimize contact with the ground, while NOAA (1985) recommended dropping to the knees during the lightning
threat, and NOAA (1970) suggested dropping to the ground.
Concerning when to reach a safe location, NOAA (1992)
recommended going to a safe location at the first sound of thunder, NOAA (1985) was not specific about when to go to a
safe place, and NOAA (1970) made no mention of this decision process.
Similar variations can be found in these and many
other publications regarding additional issues such as medical and first aid approaches to lightning victims."
-- Quotation - see Holle/Lopez.
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Technical Reviewers & References
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LIGHTNING PROTECTION SYSTEMS
What is Lightning?
Lightning Protection Systems Defined
How do Lightning Systems Work?
Damaged, Unsafe Lightning Systems
Lightning Protection Certification
Outdoor Lightning Protection Design
Lightning Protection for Trees
Hidden Lightning Protection Design
Lightning Strike Risk Assessment
How to Avoid Being Struck by Lightning
Lightning Strikes Small Boat
WIND TURBINES & LIGHTNING
- Portions of this information are based on UL publication 200-81 11/87 and other local service company information about lightning protection systems and lightning strike hazards.
- Special thanks to Associated Lightning Rod Company, Cooper Road Box 329A, Millerton NY who has been contributing technical content in presentations
to NY ASHI home inspectors since 1996. Some of that information [on lightning system material and installation details] was edited for clarity. ALRCi can be reached at 518-789-4603, 845-373-8309, 860-364-1498 and will inspect your lightning protection
system at no charge. [We have no financial nor any other business relationship with any company or product discussed at this website--DF]
- For more details on how lightning protection systems work, see Lightning Protection
from Pacific Electric and Gas Company, and Electrical System Grounding and Lightning Protection, Engineering Technical Letter 90-6, Department of the Air Force, HQ USAF.
- Lightning strike risk assessment: for the full body of this excellent article which summarizes recent opinions about lightning
strike risk assessment and safe practices for individuals or groups needing to avoid being struck by lightning, see Updated Recommendations for Lightning Safety - 1998 Ronald L. Holle and Raul E. Lopez from National Severe Storms Laboratory,
NOAA and Norman, Oklahoma, Christoph Zimmermann Global Atmospherics, Inc. Tucson, Arizona
- As we indicated in an original version of this article, a lightning strike risk assessment guide can be found in Appendix I of the
National Fire Protection Association's Lightning Protection Code, NFPA #780.
The guide considers type of structure, type
of construction, structure location, topography, occupancy, contents and lightning frequency. Contact NFPA, Batterymarch
Park, Quincy, MA 02269 617-770-3000.
- Lightning Protection Institute, 3365 N. Arlington Heights Rd., Suite J., Arlington Heights IL 60004
- Underwriters Laboratory Standard UL96A. These requirements cover the installation of lightning protection systems on all types of structures other than structures used for the production, handling, or storage of ammunition, explosives, flammable liquids or gases, and other explosive ingredients including dust. These requirements apply to lightning protection systems that are complete and cover all parts of a structure. Partial systems are not covered by this standard. These requirements do not cover the installation of lightning protection systems for electrical generating, distribution, or transmission systems. These requirements do not cover lightning protection components, which are covered by the Standard for Lightning Protection Components, UL 96.
- Underwriters Laboratory Standard UL96: These requirements cover lightning protection components for use in the installation of complete systems of lightning protection on buildings and structures. These requirements do not cover the installation of lightning protection components. Products of this type are covered by the Standard for Installation Requirements for Lightning Protection Systems, UL 96A.
- "Lightning Awareness," Gerry Schulte, BMW ON magazine, June 2007 pp. 58-60, provided some technical details about lightning, and refers readers to www.lightningsafety.noaa.gov/outdoors.htm
Books & Articles on Building & Environmental Inspection, Testing, Diagnosis, & Repair
 The Home Reference Book - the Encyclopedia of Homes, Carson Dunlop & Associates, Toronto, Ontario, 25th Ed., 2012, is a bound volume of more than 450 illustrated pages that assist home inspectors and home owners in the inspection and detection of problems on buildings. The text is intended as a reference guide to help building owners operate and maintain their home effectively. Field inspection worksheets are included at the back of the volume. Special Offer: For a 10% discount on any number of copies of the Home Reference Book purchased as a single order. Enter INSPECTAHRB in the order payment page "Promo/Redemption" space. InspectAPedia.com editor Daniel Friedman is a contributing author.
Or choose the The Home Reference eBook for PCs, Macs, Kindle, iPad, iPhone, or Android Smart Phones. Special Offer: For a 5% discount on any number of copies of the Home Reference eBook purchased as a single order. Enter INSPECTAEHRB in the order payment page "Promo/Redemption" space.
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 Armor Lightning Protection Inc Manchester Center, VT, 802-375-0266
state-of-the-art lightning protection and surge protection for residential and commercial buildings in Vermont, New England, and throughout the Northeast- Associated Lightning Rod Company, Inc., Box 329A, Cooper Road, Millerton, NY 12546 914/373-8309 518/789-4603
- A-C Lightning Security, Inc., 2100 East First St., PO Box 329, Maryville MO 64468 816-582-8115 800-821-5575 816-562-2932. In New York, Hudson Valley, contact Christensen Electrical Power Systems, Richard G. Christensen, 518-537-4128.
- Lightning Eliminators & Consultants 6687 Arapahoe Road Boulder, CO 80303 (303) 447-2828. "Engineering Solutions For Lightning, Grounding and Surge Protection Worldwide Since 1971"
- Electrical EINET
- Lightning Protection for Facilities, Dr. Bruce Gabrielson, Robert B. Marcus, Published and presented: EMCEXPO92, Washington D.C.
- MIT's Electrical Safety Files
- Lightning Protection for Workers What to Do if You're Outside in a Lightning Storm - Center to Protect Workers' Rights (PDF)
- 1998 and Current Lightning Protection Conferences & Exhibitions
- Lightning Risk and Hazard Analysis Measurement from the National Lightning Safety Institute (NLSI).
- "Lightning Fatalities, Injuries, and Damage Reports in the United States from 1959-1994", E. Brian Curran, Ronald L. Holle, Raul E. Lopez, NOAA Technical Memorandum NWS SR-193 October 1997
- UL - Underwriters Labs Lightning equipment certification program.
"Underwriters Laboratories Inc. (UL) has been testing and certifying lightning protection equipment since 1908. UL issues certificates of conformance for systems, inspecting system components and checking completed installations. Installations are required to comply with UL's internationally recognized Standards for lightning protection systems. Manufacturers, suppliers and installers demonstrate their commitment to safety by building,
selling and installing only those lightning protection products that pass UL's rigorous testing." -- (Op.Cit.)
- * Safety Hazards and Safe Inspection Procedures for Electrical and Home Inspectors at Residential Electric Panels
- Aluminum Wiring Information Website Aluminum Electrical Wiring Hazards and Repairs: in-depth authoritative info, photos, documents including selection of proper vs. ineffective repair methods. E.g.: Ideal 65 "Twister" purple connector fails in field and lab testing with aluminum wire.
- Electrical Panels, How to Inspect in buildings, safety for electrical inspectors, electrical panel, fusing, wiring defects, defective products. Inspection Class Presentation
- Lightning Strike Risk Assessment, Protection Systems & Services
- Multi-wire branch circuit inspection and defects
- Rust and Corrosion in Electrical Panels, A Study and Report on Frequency and Cause for Electrical and Home Inspectors at Residential Electric Panels
- Directory of Home Inspectors accessible via internet
- Electrical System & Wiring Hazard Inspection, Detection, Cause, Remedy, Prevention - Main Electrical Page
- ...
Books & Articles on Building & Environmental Inspection, Testing, Diagnosis, & Repair
- The Home Reference Book - the Encyclopedia of Homes, Carson Dunlop & Associates, Toronto, Ontario, 25th Ed., 2012, is a bound volume of more than 450 illustrated pages that assist home inspectors and home owners in the inspection and detection of problems on buildings. The text is intended as a reference guide to help building owners operate and maintain their home effectively. Field inspection worksheets are included at the back of the volume. Special Offer: For a 10% discount on any number of copies of the Home Reference Book purchased as a single order. Enter INSPECTAHRB in the order payment page "Promo/Redemption" space. InspectAPedia.com editor Daniel Friedman is a contributing author.
Or choose the The Home Reference eBook for PCs, Macs, Kindle, iPad, iPhone, or Android Smart Phones. Special Offer: For a 5% discount on any number of copies of the Home Reference eBook purchased as a single order. Enter INSPECTAEHRB in the order payment page "Promo/Redemption" space.
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- Armor Lightning Protection Inc Manchester Center, VT, 802-375-0266
state-of-the-art lightning protection and surge protection for residential and commercial buildings in Vermont, New England, and throughout the Northeast
- Associated Lightning Rod Company, Inc., Box 329A, Cooper Road, Millerton, NY 12546 914/373-8309 518/789-4603
- A-C Lightning Security, Inc., 2100 East First St., PO Box 329, Maryville MO 64468 816-582-8115 800-821-5575 816-562-2932. In New York, Hudson Valley, contact Christensen Electrical Power Systems, Richard G. Christensen, 518-537-4128.
- Lightning Eliminators & Consultants 6687 Arapahoe Road Boulder, CO 80303 (303) 447-2828. "Engineering Solutions For Lightning, Grounding and Surge Protection Worldwide Since 1971"
- Electrical EINET
- Lightning Protection for Facilities, Dr. Bruce Gabrielson, Robert B. Marcus, Published and presented: EMCEXPO92, Washington D.C.
- MIT's Electrical Safety Files
- Lightning Protection for Workers What to Do if You're Outside in a Lightning Storm - Center to Protect Workers' Rights (PDF)
- 1998 and Current Lightning Protection Conferences & Exhibitions
- Lightning Risk and Hazard Analysis Measurement from the National Lightning Safety Institute (NLSI).
- "Lightning Fatalities, Injuries, and Damage Reports in the United States from 1959-1994", E. Brian Curran, Ronald L. Holle, Raul E. Lopez, NOAA Technical Memorandum NWS SR-193 October 1997
- UL - Underwriters Labs Lightning equipment certification program.
"Underwriters Laboratories Inc. (UL) has been testing and certifying lightning protection equipment since 1908. UL issues certificates of conformance for systems, inspecting system components and checking completed installations. Installations are required to comply with UL's internationally recognized Standards for lightning protection systems. Manufacturers, suppliers and installers demonstrate their commitment to safety by building,
selling and installing only those lightning protection products that pass UL's rigorous testing." -- (Op.Cit.)
- * Safety Hazards and Safe Inspection Procedures for Electrical and Home Inspectors at Residential Electric Panels
- Aluminum Wiring Information Website Aluminum Electrical Wiring Hazards and Repairs: in-depth authoritative info, photos, documents including selection of proper vs. ineffective repair methods. E.g.: Ideal 65 "Twister" purple connector fails in field and lab testing with aluminum wire.
- Electrical Panels, How to Inspect in buildings, safety for electrical inspectors, electrical panel, fusing, wiring defects, defective products. Inspection Class Presentation
- Lightning Strike Risk Assessment, Protection Systems & Services
- Multi-wire branch circuit inspection and defects
- Rust and Corrosion in Electrical Panels, A Study and Report on Frequency and Cause for Electrical and Home Inspectors at Residential Electric Panels
- Directory of Home Inspectors accessible via internet
- Electrical System & Wiring Hazard Inspection, Detection, Cause, Remedy, Prevention - Main Electrical Page
- ...
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