Lightning Strike Probability Calculator

Lightning Strike Probability

Estimate the probability of a lightning strike based on location flash density, elevation, structure height, and exposure time.

Local Flash Density (strikes/km²/year)

Structure Height (ft)

Structure Footprint (sq ft)

Annual Outdoor Exposure (hours)

Formula

Effective Area = Structure Area + 9π x Height²; Annual Probability = 1 - e^(-Flash Density x Effective Area in km²); Personal Risk = Flash Density x Body Area x (Exposure Hours / 8760)

Frequently Asked Questions

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