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2024 Hennepin County All -Jurisdiction Hazard Mitigation Plan <br />Volume 2 — Hazard Inventory <br />GRAPHIC 4.3.5113 <br />3.5 <br />3 <br />2.5 <br />c 2 <br />0 <br />1.5 <br />1 <br />0.5 <br />0 <br />Total Damage Cost from Lightning Per Year: Minnesota <br />- 10 Year Average = 1.21 <br />2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 <br />4.3.5.3. Spectrum of Consequences B2b <br />Lightning strikes are the leading causes of wildfires and have been responsible in the past for some of the <br />most devastating fires in the southwest United States. According to Storm Data, Minnesota ranks 281h in <br />the United States in lightning deaths from 1959-2012. Lightning is not only a threat to public safety, but <br />also a threat for public and private structures because of the large number of structural fires started from <br />lightning each year. Lightning can have direct and/or indirect effect, depending on whether it strikes a <br />structure directly or not. The effects depend greatly on the conductivity of the materials the electricity <br />travels through. <br />Material <br />Consequence <br />Electrical voltages created by electrical discharges dissipated in the ground <br />Electrical <br />that is struck by lightning. <br />Substantial damage and injuries from fires, burns, and destruction caused by <br />Thermal <br />a major release of heat. <br />Forces of attraction occur between parallel conductors that are traversed by <br />Electrodynamic <br />currents in the same direction create mechanical stresses and strain. <br />The lightning current induces extremely high voltage and an extremely strong <br />Electromagnetic <br />electromagnetic field that generate very powerful electric pulses that can <br />damage sensitive electronic devices. <br />Electrochemical <br />Corrosion due to currents circulating through buried conductors <br />Acoustic (Thunder and <br />Windowpanes can be shattered a few meters from the point of impact. <br />110 <br />